1 Intel 830M/845G/852GM/855GM/865G/915G/945G Framebuffer driver
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5 This is a framebuffer driver for various Intel 8xx/9xx compatible
6 graphics devices. These would include:
20 B. List of available options
23 enables the intelfb driver
25 Recommendation: required
27 b. "mode=<xres>x<yres>[-<bpp>][@<refresh>]"
30 Recommendation: user preference
31 (default = 1024x768-32@70)
34 select amount of system RAM in MB to allocate for the video memory
35 if not enough RAM was already allocated by the BIOS.
37 Recommendation: 1 - 4 MB.
41 select at what offset in MB of the logical memory to allocate the
42 framebuffer memory. The intent is to avoid the memory blocks
43 used by standard graphics applications (XFree86). Depending on your
44 usage, adjust the value up or down, (0 for maximum usage, 63/127 MB
45 for the least amount). Note, an arbitrary setting may conflict
48 Recommendation: do not set
52 enable text acceleration. This can be enabled/reenabled anytime
53 by using 'fbset -accel true/false'.
55 Recommendation: enable
59 enable cursor acceleration.
61 Recommendation: enable
65 enable MTRR. This allows data transfers to the framebuffer memory
66 to occur in bursts which can significantly increase performance.
67 Not very helpful with the intel chips because of 'shared memory'.
73 disable mode switching.
75 Recommendation: do not set
78 The binary parameters can be unset with a "no" prefix, example "noaccel".
79 The default parameter (not named) is the mode.
83 Separate each option/option-pair by commas (,) and the option from its value
84 with an equals sign (=) as in the following:
86 video=intelfb:option1,option2=value2
91 In /etc/lilo.conf, add the line:
93 append="video=intelfb:mode=800x600-32@75,accel,hwcursor,vram=8"
95 This will initialize the framebuffer to 800x600 at 32bpp and 75Hz. The
96 framebuffer will use 8 MB of System RAM. hw acceleration of text and cursor
102 If setting this parameter doesn't work (you stay in a 80x25 text-mode),
103 you might need to set the "vga=<mode>" parameter too - see vesafb.txt
109 The module parameters are essentially similar to the kernel
110 parameters. The main difference is that you need to include a Boolean value
111 (1 for TRUE, and 0 for FALSE) for those options which don't need a value.
113 Example, to enable MTRR, include "mtrr=1".
118 Using the same setup as described above, load the module like this:
120 modprobe intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1
122 Or just add the following to /etc/modprobe.conf
124 options intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1
133 1. Geert Uytterhoeven - his excellent howto and the virtual
134 framebuffer driver code made this possible.
136 2. Jeff Hartmann for his agpgart code.
138 3. David Dawes for his original kernel 2.4 code.
140 4. The X developers. Insights were provided just by reading the
143 5. Antonino A. Daplas for his inspiring i810fb driver.
145 6. Andrew Morton for his kernel patches maintenance.
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