2.6.30-rc2 + xorg-intel-2.7.0 + DRM_I915_KMS = corruption

Alex Bennee kernel-hacker at bennee.com
Mon Apr 27 22:37:10 PDT 2009

2009/4/27 Florian Mickler <florian at mickler.org>:
> On Sun, 19 Apr 2009 07:27:35 +0100
> Alex Bennee <kernel-hacker at bennee.com> wrote:
>> Heading the warnings in the menuconfig I did try and ensure I have all
>> the up to date parts of user-space. With KMS enabled GDM starts up but
>> then corrupts the display with vertical lines. Disabling the kernel
>> config and everything starts up fine, UXA acceleration seems OK and
>> the speed of compiz is finally back up to ~60fps thanks to the A17
>> fix.
>> Am I missing another bit of user space for KMS to work properly?

Apparently I was missing a key bit and had to enable fbdev from the
command line:

kernel /kernel-2.6-drm root=/dev/sda2
video=intelfb:mode=1440x900-32 at 75,accel,hwcursor

However I still saw the same corruption kick in when GDM started. I
couldn't switch mode either which kinda defeated the point.

> hm, are you using the xf86-video-intel git-branch "2.7"? if i use that,
> i need a kernel fix queued in eanholts for-linus git-tree or else i
> also get unusable X.

No, I'm using the actual released 2.7.0 driver (as built via a simple
Gentoo ebuild)

> i assumed that this was because of some not-yet-released fixes
> on the 2.7-branch which will get released as soon as erics queue is
> merged? but i didn't double check ...  maybe the released version is
> also broken in this regard for me....

I tried again with the latest drm-intel kernel git tree @

commit 44ab43155e8071fbf037513e57de9a79044edf56
Author: Matthew Garrett <mjg59 at srcf.ucam.org>
Date:   Wed Apr 1 19:53:33 2009 +0100

    drm/i915: Enable ASLE if present

    The changes to opregion initialisation order meant that the ASLE setup
    code might not be run at the correct time. Ensure that the interrupts are
    set up.

    Signed-off-by: Matthew Garrett <mjg at redhat.com>
    Signed-off-by: Eric Anholt <eric at anholt.net>

Still broken :-(

Alex, homepage: http://www.bennee.com/~alex/
CV: http://www.bennee.com/~alex/cv.php

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