[Bug 92879] display corruption on 945GME on 4.3.0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92879

--- Comment #7 from James <james at nurealm.net> ---
I am also seeing display corruption, on an Acer Aspire 3680, running 32b, where
lspci gives:
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML
Express Integrated Graphics Controller (rev 03)

On a 1280x800 display, the top two and bottom two lines appear normal.  In the
corrupted area, successive scan lines are displaced from the correct position,
from the left to about 4/5 of the width, followed by normal text displaced
vertically. 

This is still present in linux 4.3.3.  In the 4.3.0 kernel, Xorg would still
produce a normal display, but not with 4.3.3, except that the mouse cursor is
displayed properly.

WARNING: CPU: 0 PID: 48 at drivers/gpu/drm/i915/intel_display.c:1389
assert_planes_disabled+0x100/0x140 [i915]()
plane B assertion failure, should be off on pipe B but is still active
...
WARNING: CPU: 0 PID: 38 at drivers/gpu/drm/drm_atomic.c:491
drm_atomic_check_only+0x4bf/0x5a0 [drm]()
...
WARNING: CPU: 0 PID: 38 at drivers/gpu/drm/i915/intel_fbdev.c:400
intel_fb_initial_config+0x2dc/0x5f0 [i915]()
WARN_ON(!encoder->crtc)
...
WARNING: CPU: 0 PID: 38 at drivers/gpu/drm/i915/intel_display.c:11599
intel_plane_atomic_calc_changes+0x51c/0x690 [i915]()
WARN_ON(was_visible)
...
WARNING: CPU: 0 PID: 38 at drivers/gpu/drm/drm_atomic_helper.c:674
drm_atomic_helper_update_legacy_modeset_state+0x26a/0x280 [drm_kms_helper]()
...
(first warning repeats)

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