Intel 830M/845G/852GM/855GM/865G/915G/945G Framebuffer driver
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================================================================
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A. Introduction
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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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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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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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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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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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###########################
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Sylvain
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