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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Semi-random Broadwell-U GPU hangs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94599">94599</a>
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<th>Summary</th>
<td>Semi-random Broadwell-U GPU hangs
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>mva@mva.name
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>i915 platform</th>
<td>BDW
</td>
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<th>i915 features</th>
<td>display/LVDS
</td>
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<pre>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)</pre>
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</p>
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