[Bug 86883] Regression on Atom graphics ("black screen of death", EeePc 1015? Pineview only?): kernel BUG with 3.16.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86883

--- Comment #4 from Erich Schubert <erich at debian.org> ---
Created attachment 110791
  --> https://bugs.freedesktop.org/attachment.cgi?id=110791&action=edit
dmesg with drm.debug=7

Note: I bootet the system, got the lockup, but I had forgotten to put
drm.debug=7 on the boot command line first. At the second boot (with debug=7),
the system booted correctly; on the third attempt (with debug=7), drm crashed
again. I am able to login via ssh to the system to access the logs.

The first difference is right before the BUG_ON is triggered:
---[unsuccessful]---
[drm:i9xx_get_plane_config] pipe/plane 1/1 with fb: size=640x400 at 32,
offset=1d4c00, pitch 3200, size 0x139000
[drm:i915_gem_object_create_stolen_for_preallocated] creating preallocated
stolen object: stolen_offset=1d4c00, gtt_offset=1d4c00, size=139000
kernel BUG at
/build/linux-cizhNw/linux-3.16.7/drivers/gpu/drm/i915/i915_gem_stolen.c:431!
--- 8>< --

---[successful]---
[drm:i9xx_get_plane_config] pipe/plane 1/1 with fb: size=640x400 at 32, offset=0,
pitch 3200, size 0x139000
[drm:i915_gem_object_create_stolen_for_preallocated] creating preallocated
stolen object: stolen_offset=0, gtt_offset=0, size=139000
[drm:i915_pages_create_for_stolen] offset=0x0, size=1282048
--- 8>< --

Note the offset in i9xx_get_plane_config not being 0 in the unsuccessful boot.

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