[Intel-gfx] drm/i915 X crashes on 835GM (IBM R31)

Chris Wilson chris at chris-wilson.co.uk
Mon Oct 21 15:01:40 CEST 2013

On Mon, Oct 21, 2013 at 10:12:07AM +0200, Thomas Richter wrote:
> Daniel, others,
> last Friday, I tried drm-intel-nightly on an IBM R31 Thinkpad. This
> also comes with a 835GM chipset (same as the Fujitsu), but the
> display is connected via LVDS and not via the NS2501 DVO.
> *) Panning also causes the flicker we know already. Interestingly,
> kernel 3.2.0-4 *does not* cause this flicker, it only flickers on
> the external
> screen, but not internally.
> Is there any way to read the i915 registers from the working 3.2.0-4
> panning and compare that to what the drm-nightly kernel installs?
> Something must be different.
> *) If I connect an external monitor *before* turning the machine on,
> X creates a segfault. On this machine, no Xorg.conf exists and it is
> up to X to
> configure the screens correctly:

A full drm.debug=6 dmesg, Xorg.0.log and xrandr --verbose would be
useful starting point to distangling what is going on. Is this an 830gm
or an 845g? google says 830gm, so there should be 2 crtcs available for
you to drive the two outputs independently, and we need to find out what
is going wrong.

Chris Wilson, Intel Open Source Technology Centre

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