Re: MTRR problem, maybe FB related
From: Dave Jones (davej_at_redhat.com)
Date: 08/06/04
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Date: Fri, 6 Aug 2004 21:34:36 +0100 To: "admin@wodkahexe.de" <admin@wodkahexe.de>
On Fri, Aug 06, 2004 at 07:47:22PM +0200, admin@wodkahexe.de wrote:
> vesafb: framebuffer at 0xb0000000, mapped to 0xdf80d000, size 6144k
> vesafb: mode is 1024x768x32, linelength=4096, pages=4
vesafb's mtrr usage is borken. Instead of creating an MTRR the size
of video RAM, it creates one the size of the display.
> mtrr: 0xb0000000,0x8000000 overlaps existing 0xb0000000,0x400000
> [drm] Initialized i830 1.3.2 20021108 on minor 0: Intel Corp. 82852/855GM Integrated Graphics Device
> mtrr: 0xb0000000,0x8000000 overlaps existing 0xb0000000,0x400000
> [drm] Initialized i830 1.3.2 20021108 on minor 1: Intel Corp. 82852/855GM Integrated Graphics Device (#2)
Then X comes along, sizes the video ram, and tries to create an MTRR
of the correct size, but the framebuffer got there first and bodged it.
I used to see this happening also on my Matrox g550, but it seems
to have 'gone away' in recent times. I haven't checked out why,
but I'm suspecting X now detects this case, and deletes the crap
entry, and puts the proper values in its place.
> when starting X i'm getting the following in dmesg:
>
> mtrr: base(0xb0020000) is not aligned on a size(0x180000) boundary
This one I can't explain however.
> mtrr: 0xb0000000,0x8000000 overlaps existing 0xb0000000,0x400000
>
> is there any way to get both working together? (fb + mtrr)
Disable MTRR for vesafb. iirc, there's a boot command line option to do it.
Dave
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