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

Jesse Barnes jbarnes at virtuousgeek.org
Tue Apr 28 09:53:38 PDT 2009

On Tue, 28 Apr 2009 06:37:10 +0100
Alex Bennee <kernel-hacker at bennee.com> wrote:

> 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.

The above seems to indicate that you have some FB drivers built into
your kernel; that will likely fail in weird ways.  Try disabling all
the FB drivers, but keep CONFIG_FRAMEBUFFER_CONSOLE enabled.  Then when
you load the i915 driver you should get a nice console.

Jesse Barnes, Intel Open Source Technology Center

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