[Bug 38689] Black xorg screen with kernels newer than 2.6.34.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38689

--- Comment #7 from Michel Dänzer <michel at daenzer.net> 2011-06-27 02:47:29 PDT ---
(In reply to comment #7)
> I even tried with XAA, disabling ColorTiling, PCI bus type, disabling AGP Fast
> Writes, disabling DRI, ... to no avail.

Most of these X driver options are ineffective with KMS.


> On my TV, which I connect from the DVI-0 output to a HDMI input (although I
> also tried through VGA), I can see it sets the video mode correctly,
> 1920*1080 at 50. In fact the kms console works fine all along.
> Even with the black xorg screen, I can switch back to a kms console and it
> works.

What X clients are (supposed to be) running at that point? A login manager such
as gdm or kdm, or a user session? If the latter, is it using an OpenGL
compositing manager?


> I considered doing a bisect between 2.6.34 and 2.6.35 but there are far too
> many commits within drm for it to be feasible (it is not exactly fast this
> oldie).

As a quick'n'dirty test, you could try compiling the 2.6.35 radeon driver with
KMS_DRIVER_MINOR modified to 3 in drivers/gpu/drm/radeon/radeon_drv.c . If that
works around the problem, it's probably indeed related to the GLX sync
extensions, and there's probably no point in bisecting the kernel.

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