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    SubjectRe: X and intelfb fight over videomode
    David Härdeman wrote:
    > Using the information from this thread:
    > http://marc.theaimsgroup.com/?t=112593256400003&r=1&w=2
    >
    > I've now compiled a kernel with the intelfb and fbcon drivers linked in
    > (no other fb drivers). By booting the kernel with vga=0x318 I get a
    > 1024x768@16bpp console and drm/agp also seems happy.
    >
    > However, as soon as X starts, the following message is printed to the
    > kernel log:
    >
    > mtrr: base(0xe0020000) is not aligned on a size(0x300000) boundary
    > [drm:drm_unlock] *ERROR* Process 3013 using kernel context 0
    >
    > Everything seems to work in X though. The first time that I switch from
    > X to a vc, the screen stays black for a few seconds before I get the VC
    > and then I get this:
    >
    > intelfb: Changing the video mode is not supported.
    > intelfb: ring buffer : space: 61488 wanted 65472
    > intelfb: lockup - turning off hardware acceleration
    >
    > I have X set to also use 1024x768@16bpp, what else do I need to do to
    > make sure that intelfb and X play nice together?
    >

    Try booting with video=intelfb:1024x768-16@60,mtrr=0. Do not include
    the vga=0x318 option. This prevents intelfb from changing the videomode.

    Tony
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