| 1 | ================================
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| 2 | Intel 810/815 Framebuffer driver
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| 3 | ================================
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| 4 |
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| 5 | Tony Daplas <[email protected]>
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| 6 |
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| 7 | http://i810fb.sourceforge.net
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| 8 |
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| 9 | March 17, 2002
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| 10 |
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| 11 | First Released: July 2001
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| 12 | Last Update: September 12, 2005
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| 13 |
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| 14 | A. Introduction
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| 15 | ===============
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| 16 |
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| 17 | This is a framebuffer driver for various Intel 810/815 compatible
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| 18 | graphics devices. These include:
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| 19 |
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| 20 | - Intel 810
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| 21 | - Intel 810E
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| 22 | - Intel 810-DC100
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| 23 | - Intel 815 Internal graphics only, 100Mhz FSB
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| 24 | - Intel 815 Internal graphics only
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| 25 | - Intel 815 Internal graphics and AGP
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| 26 |
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| 27 | B. Features
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| 28 | ============
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| 29 |
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| 30 | - Choice of using Discrete Video Timings, VESA Generalized Timing
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| 31 | Formula, or a framebuffer specific database to set the video mode
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| 32 |
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| 33 | - Supports a variable range of horizontal and vertical resolution and
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| 34 | vertical refresh rates if the VESA Generalized Timing Formula is
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| 35 | enabled.
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| 36 |
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| 37 | - Supports color depths of 8, 16, 24 and 32 bits per pixel
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| 38 |
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| 39 | - Supports pseudocolor, directcolor, or truecolor visuals
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| 40 |
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| 41 | - Full and optimized hardware acceleration at 8, 16 and 24 bpp
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| 42 |
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| 43 | - Robust video state save and restore
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| 44 |
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| 45 | - MTRR support
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| 46 |
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| 47 | - Utilizes user-entered monitor specifications to automatically
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| 48 | calculate required video mode parameters.
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| 49 |
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| 50 | - Can concurrently run with xfree86 running with native i810 drivers
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| 51 |
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| 52 | - Hardware Cursor Support
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| 53 |
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| 54 | - Supports EDID probing either by DDC/I2C or through the BIOS
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| 55 |
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| 56 | C. List of available options
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| 57 | =============================
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| 58 |
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| 59 | a. "video=i810fb"
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| 60 | enables the i810 driver
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| 61 |
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| 62 | Recommendation: required
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| 63 |
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| 64 | b. "xres:<value>"
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| 65 | select horizontal resolution in pixels. (This parameter will be
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| 66 | ignored if 'mode_option' is specified. See 'o' below).
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| 67 |
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| 68 | Recommendation: user preference
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| 69 | (default = 640)
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| 70 |
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| 71 | c. "yres:<value>"
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| 72 | select vertical resolution in scanlines. If Discrete Video Timings
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| 73 | is enabled, this will be ignored and computed as 3*xres/4. (This
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| 74 | parameter will be ignored if 'mode_option' is specified. See 'o'
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| 75 | below)
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| 76 |
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| 77 | Recommendation: user preference
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| 78 | (default = 480)
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| 79 |
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| 80 | d. "vyres:<value>"
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| 81 | select virtual vertical resolution in scanlines. If (0) or none
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| 82 | is specified, this will be computed against maximum available memory.
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| 83 |
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| 84 | Recommendation: do not set
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| 85 | (default = 480)
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| 86 |
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| 87 | e. "vram:<value>"
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| 88 | select amount of system RAM in MB to allocate for the video memory
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| 89 |
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| 90 | Recommendation: 1 - 4 MB.
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| 91 | (default = 4)
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| 92 |
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| 93 | f. "bpp:<value>"
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| 94 | select desired pixel depth
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| 95 |
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| 96 | Recommendation: 8
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| 97 | (default = 8)
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| 98 |
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| 99 | g. "hsync1/hsync2:<value>"
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| 100 | select the minimum and maximum Horizontal Sync Frequency of the
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| 101 | monitor in kHz. If using a fixed frequency monitor, hsync1 must
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| 102 | be equal to hsync2. If EDID probing is successful, these will be
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| 103 | ignored and values will be taken from the EDID block.
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| 104 |
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| 105 | Recommendation: check monitor manual for correct values
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| 106 | (default = 29/30)
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| 107 |
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| 108 | h. "vsync1/vsync2:<value>"
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| 109 | select the minimum and maximum Vertical Sync Frequency of the monitor
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| 110 | in Hz. You can also use this option to lock your monitor's refresh
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| 111 | rate. If EDID probing is successful, these will be ignored and values
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| 112 | will be taken from the EDID block.
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| 113 |
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| 114 | Recommendation: check monitor manual for correct values
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| 115 | (default = 60/60)
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| 116 |
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| 117 | IMPORTANT: If you need to clamp your timings, try to give some
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| 118 | leeway for computational errors (over/underflows). Example: if
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| 119 | using vsync1/vsync2 = 60/60, make sure hsync1/hsync2 has at least
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| 120 | a 1 unit difference, and vice versa.
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| 121 |
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| 122 | i. "voffset:<value>"
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| 123 | select at what offset in MB of the logical memory to allocate the
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| 124 | framebuffer memory. The intent is to avoid the memory blocks
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| 125 | used by standard graphics applications (XFree86). The default
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| 126 | offset (16 MB for a 64 MB aperture, 8 MB for a 32 MB aperture) will
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| 127 | avoid XFree86's usage and allows up to 7 MB/15 MB of framebuffer
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| 128 | memory. Depending on your usage, adjust the value up or down
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| 129 | (0 for maximum usage, 31/63 MB for the least amount). Note, an
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| 130 | arbitrary setting may conflict with XFree86.
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| 131 |
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| 132 | Recommendation: do not set
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| 133 | (default = 8 or 16 MB)
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| 134 |
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| 135 | j. "accel"
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| 136 | enable text acceleration. This can be enabled/reenabled anytime
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| 137 | by using 'fbset -accel true/false'.
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| 138 |
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| 139 | Recommendation: enable
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| 140 | (default = not set)
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| 141 |
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| 142 | k. "mtrr"
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| 143 | enable MTRR. This allows data transfers to the framebuffer memory
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| 144 | to occur in bursts which can significantly increase performance.
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| 145 | Not very helpful with the i810/i815 because of 'shared memory'.
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| 146 |
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| 147 | Recommendation: do not set
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| 148 | (default = not set)
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| 149 |
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| 150 | l. "extvga"
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| 151 | if specified, secondary/external VGA output will always be enabled.
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| 152 | Useful if the BIOS turns off the VGA port when no monitor is attached.
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| 153 | The external VGA monitor can then be attached without rebooting.
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| 154 |
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| 155 | Recommendation: do not set
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| 156 | (default = not set)
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| 157 |
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| 158 | m. "sync"
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| 159 | Forces the hardware engine to do a "sync" or wait for the hardware
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| 160 | to finish before starting another instruction. This will produce a
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| 161 | more stable setup, but will be slower.
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| 162 |
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| 163 | Recommendation: do not set
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| 164 | (default = not set)
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| 165 |
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| 166 | n. "dcolor"
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| 167 | Use directcolor visual instead of truecolor for pixel depths greater
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| 168 | than 8 bpp. Useful for color tuning, such as gamma control.
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| 169 |
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| 170 | Recommendation: do not set
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| 171 | (default = not set)
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| 172 |
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| 173 | o. <xres>x<yres>[-<bpp>][@<refresh>]
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| 174 | The driver will now accept specification of boot mode option. If this
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| 175 | is specified, the options 'xres' and 'yres' will be ignored. See
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| 176 | Documentation/fb/modedb.rst for usage.
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| 177 |
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| 178 | D. Kernel booting
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| 179 | =================
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| 180 |
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| 181 | Separate each option/option-pair by commas (,) and the option from its value
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| 182 | with a colon (:) as in the following::
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| 183 |
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| 184 | video=i810fb:option1,option2:value2
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| 185 |
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| 186 | Sample Usage
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| 187 | ------------
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| 188 |
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| 189 | In /etc/lilo.conf, add the line::
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| 190 |
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| 191 | append="video=i810fb:vram:2,xres:1024,yres:768,bpp:8,hsync1:30,hsync2:55, \
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| 192 | vsync1:50,vsync2:85,accel,mtrr"
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| 193 |
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| 194 | This will initialize the framebuffer to 1024x768 at 8bpp. The framebuffer
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| 195 | will use 2 MB of System RAM. MTRR support will be enabled. The refresh rate
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| 196 | will be computed based on the hsync1/hsync2 and vsync1/vsync2 values.
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| 197 |
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| 198 | IMPORTANT:
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| 199 | You must include hsync1, hsync2, vsync1 and vsync2 to enable video modes
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| 200 | better than 640x480 at 60Hz. HOWEVER, if your chipset/display combination
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| 201 | supports I2C and has an EDID block, you can safely exclude hsync1, hsync2,
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| 202 | vsync1 and vsync2 parameters. These parameters will be taken from the EDID
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| 203 | block.
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| 204 |
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| 205 | E. Module options
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| 206 | ==================
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| 207 |
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| 208 | The module parameters are essentially similar to the kernel
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| 209 | parameters. The main difference is that you need to include a Boolean value
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| 210 | (1 for TRUE, and 0 for FALSE) for those options which don't need a value.
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| 211 |
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| 212 | Example, to enable MTRR, include "mtrr=1".
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| 213 |
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| 214 | Sample Usage
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| 215 | ------------
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| 216 |
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| 217 | Using the same setup as described above, load the module like this::
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| 218 |
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| 219 | modprobe i810fb vram=2 xres=1024 bpp=8 hsync1=30 hsync2=55 vsync1=50 \
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| 220 | vsync2=85 accel=1 mtrr=1
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| 221 |
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| 222 | Or just add the following to a configuration file in /etc/modprobe.d/::
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| 223 |
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| 224 | options i810fb vram=2 xres=1024 bpp=16 hsync1=30 hsync2=55 vsync1=50 \
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| 225 | vsync2=85 accel=1 mtrr=1
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| 226 |
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| 227 | and just do a::
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| 228 |
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| 229 | modprobe i810fb
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| 230 |
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| 231 |
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| 232 | F. Setup
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| 233 | =========
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| 234 |
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| 235 | a. Do your usual method of configuring the kernel
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| 236 |
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| 237 | make menuconfig/xconfig/config
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| 238 |
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| 239 | b. Under "Code maturity level options" enable "Prompt for development
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| 240 | and/or incomplete code/drivers".
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| 241 |
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| 242 | c. Enable agpgart support for the Intel 810/815 on-board graphics.
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| 243 | This is required. The option is under "Character Devices".
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| 244 |
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| 245 | d. Under "Graphics Support", select "Intel 810/815" either statically
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| 246 | or as a module. Choose "use VESA Generalized Timing Formula" if
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| 247 | you need to maximize the capability of your display. To be on the
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| 248 | safe side, you can leave this unselected.
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| 249 |
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| 250 | e. If you want support for DDC/I2C probing (Plug and Play Displays),
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| 251 | set 'Enable DDC Support' to 'y'. To make this option appear, set
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| 252 | 'use VESA Generalized Timing Formula' to 'y'.
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| 253 |
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| 254 | f. If you want a framebuffer console, enable it under "Console
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| 255 | Drivers".
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| 256 |
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| 257 | g. Compile your kernel.
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| 258 |
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| 259 | h. Load the driver as described in sections D and E.
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| 260 |
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| 261 | i. Try the DirectFB (http://www.directfb.org) + the i810 gfxdriver
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| 262 | patch to see the chipset in action (or inaction :-).
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| 263 |
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| 264 | G. Acknowledgment:
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| 265 | ===================
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| 266 |
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| 267 | 1. Geert Uytterhoeven - his excellent howto and the virtual
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| 268 | framebuffer driver code made this possible.
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| 269 |
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| 270 | 2. Jeff Hartmann for his agpgart code.
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| 271 |
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| 272 | 3. The X developers. Insights were provided just by reading the
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| 273 | XFree86 source code.
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| 274 |
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| 275 | 4. Intel(c). For this value-oriented chipset driver and for
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| 276 | providing documentation.
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| 277 |
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| 278 | 5. Matt Sottek. His inputs and ideas helped in making some
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| 279 | optimizations possible.
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| 280 |
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| 281 | H. Home Page:
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| 282 | ==============
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| 283 |
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| 284 | A more complete, and probably updated information is provided at
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| 285 | http://i810fb.sourceforge.net.
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| 286 |
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| 287 | Tony
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