[Bug 94599] New: Semi-random Broadwell-U GPU hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94599

            Bug ID: 94599
           Summary: Semi-random Broadwell-U GPU hangs
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mva at mva.name
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: BDW
     i915 features: display/LVDS

Hi there! Probably I chose wrong i915 platform when created bug, so, if it is,
change it to the right one, please.
I'm running i7-5700HQ APU with Broadwell-U (HD 5600, afair) GPU on board.
Unfortunatelly, I was unable to setup userland (Xorg) part by just installing
corresponding distro package with driver with SNA enabled, so I: 1) installed
xorg-driver from yesterday git master, disabled SNA and enabled UXA (both on
"./configure"-time, so I didn't touch xorg.conf at all and using Xorg
autodetection), added "video.use_native_backlight=1 i915.semaphores=1
drm_kms_helper.poll=N i915.enable_rc6=1 i915.enable_fbc=0
intel_idle.max_cstate=1 acpi_osi=Linux i915.enable_execlists=0" to kernel
commandline, and also "export hiz=false INTEL_HIZ=0 INTEL_SEPARATE_STENCIL=0
vblank_mode=0 LIBGL_ALWAYS_SOFTWARE=1;" to /etc/profile.
Without that changes I experienced system freezes (so even SysRq-magic didn't
work) in few moments after enabling compositing effects in any of my DEs (KDE5,
Enlightenment). After described changes (not sure, what exactly helped) all
kinda started to work fine (including compositing), but from time to time,
during work I still experience system freezes (although, thankfully, not all of
them are total, so, say, now I was able to switch to tty console and writing
that report in lynx).  
So, I opened dmesg | less and inspected what happened. And found there
suggestion to report "_new_ bug", so here I am.

P.S. Sorry, I'm not sure how lynx will handle text I just entered if I press
"add attachment", so I'll include /sys/class/drm/card0/error and dmesg cutoff
on next update.

Additional info: Uname: Linux-4.5.0, xorg-server-1.18.2, mesa-11.1.2
Also, just before freezing I was in X11 terminal emulator (with enabled
compositing (semitransparent background)) and edited a file in a vim. And there
was only Firefox and Thunderbird processes run under in inactive windows.
P.P.S. I'll be happy to provide any additional info on request (although, I
still can't figure out exactly conditions to 100% reproducibility)

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