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155 lines
3.8 KiB
155 lines
3.8 KiB
============================================================= |
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Intel 830M/845G/852GM/855GM/865G/915G/945G Framebuffer driver |
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============================================================= |
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A. Introduction |
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=============== |
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This is a framebuffer driver for various Intel 8xx/9xx compatible |
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graphics devices. These would include: |
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- Intel 830M |
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- Intel 845G |
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- Intel 852GM |
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- Intel 855GM |
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- Intel 865G |
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- Intel 915G |
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- Intel 915GM |
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- Intel 945G |
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- Intel 945GM |
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- Intel 945GME |
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- Intel 965G |
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- Intel 965GM |
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B. List of available options |
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============================= |
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a. "video=intelfb" |
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enables the intelfb driver |
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Recommendation: required |
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b. "mode=<xres>x<yres>[-<bpp>][@<refresh>]" |
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select mode |
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Recommendation: user preference |
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(default = 1024x768-32@70) |
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c. "vram=<value>" |
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select amount of system RAM in MB to allocate for the video memory |
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if not enough RAM was already allocated by the BIOS. |
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Recommendation: 1 - 4 MB. |
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(default = 4 MB) |
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d. "voffset=<value>" |
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select at what offset in MB of the logical memory to allocate the |
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framebuffer memory. The intent is to avoid the memory blocks |
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used by standard graphics applications (XFree86). Depending on your |
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usage, adjust the value up or down, (0 for maximum usage, 63/127 MB |
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for the least amount). Note, an arbitrary setting may conflict |
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with XFree86. |
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Recommendation: do not set |
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(default = 48 MB) |
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e. "accel" |
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enable text acceleration. This can be enabled/reenabled anytime |
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by using 'fbset -accel true/false'. |
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Recommendation: enable |
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(default = set) |
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f. "hwcursor" |
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enable cursor acceleration. |
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Recommendation: enable |
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(default = set) |
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g. "mtrr" |
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enable MTRR. This allows data transfers to the framebuffer memory |
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to occur in bursts which can significantly increase performance. |
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Not very helpful with the intel chips because of 'shared memory'. |
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Recommendation: set |
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(default = set) |
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h. "fixed" |
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disable mode switching. |
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Recommendation: do not set |
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(default = not set) |
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The binary parameters can be unset with a "no" prefix, example "noaccel". |
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The default parameter (not named) is the mode. |
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C. Kernel booting |
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================= |
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Separate each option/option-pair by commas (,) and the option from its value |
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with an equals sign (=) as in the following:: |
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video=intelfb:option1,option2=value2 |
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Sample Usage |
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------------ |
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In /etc/lilo.conf, add the line:: |
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append="video=intelfb:mode=800x600-32@75,accel,hwcursor,vram=8" |
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This will initialize the framebuffer to 800x600 at 32bpp and 75Hz. The |
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framebuffer will use 8 MB of System RAM. hw acceleration of text and cursor |
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will be enabled. |
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Remarks |
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------- |
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If setting this parameter doesn't work (you stay in a 80x25 text-mode), |
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you might need to set the "vga=<mode>" parameter too - see vesafb.txt |
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in this directory. |
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D. Module options |
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================== |
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The module parameters are essentially similar to the kernel |
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parameters. The main difference is that you need to include a Boolean value |
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(1 for TRUE, and 0 for FALSE) for those options which don't need a value. |
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Example, to enable MTRR, include "mtrr=1". |
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Sample Usage |
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------------ |
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Using the same setup as described above, load the module like this:: |
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modprobe intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1 |
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Or just add the following to a configuration file in /etc/modprobe.d/:: |
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options intelfb mode=800x600-32@75 vram=8 accel=1 hwcursor=1 |
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and just do a:: |
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modprobe intelfb |
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E. Acknowledgment: |
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=================== |
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1. Geert Uytterhoeven - his excellent howto and the virtual |
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framebuffer driver code made this possible. |
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2. Jeff Hartmann for his agpgart code. |
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3. David Dawes for his original kernel 2.4 code. |
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4. The X developers. Insights were provided just by reading the |
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XFree86 source code. |
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5. Antonino A. Daplas for his inspiring i810fb driver. |
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6. Andrew Morton for his kernel patches maintenance. |
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Sylvain
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