1 Intel 830M/845G/852GM/855GM/865G/915G/945G Framebuffer driver
2 ================================================================
5 This is a framebuffer driver for various Intel 8xx/9xx compatible
6 graphics devices. These would include:
18 B. List of available options
21 enables the intelfb driver
23 Recommendation: required
25 b. "mode=<xres>x<yres>[-<bpp>][@<refresh>]"
28 Recommendation: user preference
29 (default = 1024x768-32@70)
32 select amount of system RAM in MB to allocate for the video memory
33 if not enough RAM was already allocated by the BIOS.
35 Recommendation: 1 - 4 MB.
39 select at what offset in MB of the logical memory to allocate the
40 framebuffer memory. The intent is to avoid the memory blocks
41 used by standard graphics applications (XFree86). Depending on your
42 usage, adjust the value up or down, (0 for maximum usage, 63/127 MB
43 for the least amount). Note, an arbitrary setting may conflict
46 Recommendation: do not set
50 enable text acceleration. This can be enabled/reenabled anytime
51 by using 'fbset -accel true/false'.
53 Recommendation: enable
57 enable cursor acceleration.
59 Recommendation: enable
63 enable MTRR. This allows data transfers to the framebuffer memory
64 to occur in bursts which can significantly increase performance.
65 Not very helpful with the intel chips because of 'shared memory'.
71 disable mode switching.
73 Recommendation: do not set
76 The binary parameters can be unset with a "no" prefix, example "noaccel".
77 The default parameter (not named) is the mode.
81 Separate each option/option-pair by commas (,) and the option from its value
82 with an equals sign (=) as in the following:
84 video=intelfb:option1,option2=value2
89 In /etc/lilo.conf, add the line:
91 append="video=intelfb:800x600-32@75,accel,hwcursor,vram=8"
93 This will initialize the framebuffer to 800x600 at 32bpp and 75Hz. The
94 framebuffer will use 8 MB of System RAM. hw acceleration of text and cursor
99 The module parameters are essentially similar to the kernel
100 parameters. The main difference is that you need to include a Boolean value
101 (1 for TRUE, and 0 for FALSE) for those options which don't need a value.
103 Example, to enable MTRR, include "mtrr=1".
108 Using the same setup as described above, load the module like this:
110 modprobe intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1
112 Or just add the following to /etc/modprobe.conf
114 options intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1
123 1. Geert Uytterhoeven - his excellent howto and the virtual
124 framebuffer driver code made this possible.
126 2. Jeff Hartmann for his agpgart code.
128 3. David Dawes for his original kernel 2.4 code.
130 4. The X developers. Insights were provided just by reading the
133 5. Antonino A. Daplas for his inspiring i810fb driver.
135 6. Andrew Morton for his kernel patches maintenance.
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