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:
21 B. List of available options
24 enables the intelfb driver
26 Recommendation: required
28 b. "mode=<xres>x<yres>[-<bpp>][@<refresh>]"
31 Recommendation: user preference
32 (default = 1024x768-32@70)
35 select amount of system RAM in MB to allocate for the video memory
36 if not enough RAM was already allocated by the BIOS.
38 Recommendation: 1 - 4 MB.
42 select at what offset in MB of the logical memory to allocate the
43 framebuffer memory. The intent is to avoid the memory blocks
44 used by standard graphics applications (XFree86). Depending on your
45 usage, adjust the value up or down, (0 for maximum usage, 63/127 MB
46 for the least amount). Note, an arbitrary setting may conflict
49 Recommendation: do not set
53 enable text acceleration. This can be enabled/reenabled anytime
54 by using 'fbset -accel true/false'.
56 Recommendation: enable
60 enable cursor acceleration.
62 Recommendation: enable
66 enable MTRR. This allows data transfers to the framebuffer memory
67 to occur in bursts which can significantly increase performance.
68 Not very helpful with the intel chips because of 'shared memory'.
74 disable mode switching.
76 Recommendation: do not set
79 The binary parameters can be unset with a "no" prefix, example "noaccel".
80 The default parameter (not named) is the mode.
84 Separate each option/option-pair by commas (,) and the option from its value
85 with an equals sign (=) as in the following:
87 video=intelfb:option1,option2=value2
92 In /etc/lilo.conf, add the line:
94 append="video=intelfb:mode=800x600-32@75,accel,hwcursor,vram=8"
96 This will initialize the framebuffer to 800x600 at 32bpp and 75Hz. The
97 framebuffer will use 8 MB of System RAM. hw acceleration of text and cursor
103 If setting this parameter doesn't work (you stay in a 80x25 text-mode),
104 you might need to set the "vga=<mode>" parameter too - see vesafb.txt
110 The module parameters are essentially similar to the kernel
111 parameters. The main difference is that you need to include a Boolean value
112 (1 for TRUE, and 0 for FALSE) for those options which don't need a value.
114 Example, to enable MTRR, include "mtrr=1".
119 Using the same setup as described above, load the module like this:
121 modprobe intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1
123 Or just add the following to a configuration file in /etc/modprobe.d/
125 options intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1
134 1. Geert Uytterhoeven - his excellent howto and the virtual
135 framebuffer driver code made this possible.
137 2. Jeff Hartmann for his agpgart code.
139 3. David Dawes for his original kernel 2.4 code.
141 4. The X developers. Insights were provided just by reading the
144 5. Antonino A. Daplas for his inspiring i810fb driver.
146 6. Andrew Morton for his kernel patches maintenance.
148 ###########################