[Bug 92181] [SKL] igt/kms_plane/plane-position-covered-pipe-b-plane-2 fail and cause system crash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92181

--- Comment #19 from cprigent <christophe.prigent at intel.com> ---
Created attachment 121455
  --> https://bugs.freedesktop.org/attachment.cgi?id=121455&action=edit
4.5-rc1_nuc-skly_kms-flip_kern.log

I don't reproduce the crash (tested 10 times), test is success but with
following log:

./kms_plane --run-subtest plane-position-covered-pipe-B-plane-2                
                           IGT-Version: 1.13-NOT-GIT (x86_64) (Linux:
4.5.0-rc1-nightly+ x86_64)
Testing connector HDMI-A-1 using pipe B plane 2
Testing connector DP-1 using pipe B plane 2
Subtest plane-position-covered-pipe-B-plane-2: SUCCESS (0.746s)
[   33.164446] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[   33.178989] [drm:intel_atomic_commit [i915]] *ERROR* mismatch in
dpll_hw_state.cfgcr1 (expected 0x80400173, found 0x000003a5)
[   33.179006] [drm:intel_atomic_commit [i915]] *ERROR* mismatch in
base.adjusted_mode.crtc_clock (expected 148500, found 168400)
[   33.179020] [drm:intel_atomic_commit [i915]] *ERROR* mismatch in port_clock
(expected 148500, found 168400)

Hardware
Platform: NUC6i3SYH
CPU: Intel(R) Core(TM) i3-6100U CPU @ 2.30GHZ (family 6, model 78, stepping 3)
Motherboard version: H81132-502
GPU: Intel® HD Graphics 520 - Intel Corporation Sky Lake Integrated Graphics
(rev 07)
Memory: one 8GB card Kingston KVR21S15D8/8
SSD: Samsung 850 EVO M.2 120 Go
Software
Bios: SYSKLi35.86A.0024.2015.1027.2142
Linux distribution: Ubuntu 15.10 64 bits
Kernel: drm-intel-nightly 4.5.0-rc1 5d3deb0 from
http://cgit.freedesktop.org/drm-intel
   commit 5d3deb0902a962218ad9b0e583e4d1bbdec29f9a
   Author: Rodrigo Vivi <rodrigo.vivi at intel.com>
   Date:   Mon Feb 1 12:05:18 2016 -0800
   drm-intel-nightly: 2016y-02m-01d-20h-05m-03s UTC integration manifest
drm: tag libdrm-2.4.66 e342c0f from http://cgit.freedesktop.org/mesa/drm/
mesa: tag mesa-11.0.8 261daab from http://cgit.freedesktop.org/mesa/mesa/
cairo: tag 1.15.2 db8a7f1 from http://cgit.freedesktop.org/cairo
waffle: master bb29b2a from https://github.com/waffle-gl/waffle
xorg-server-macros: master d7acec2 from
git://git.freedesktop.org/git/xorg/util/macros
libva: tag libva-1.6.1 cb418f6 from http://cgit.freedesktop.org/libva/
vaapi-intel-driver: tag 1.6.1 2110b3a from
http://cgit.freedesktop.org/vaapi/intel-driver

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