[Bug 91495] Periodically video will freeze for no specific reason. Sometimes putting '[drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed... render ring idle' in syslog

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91495

--- Comment #9 from Chris <cpollock at embarqmail.com> ---
Video froze on 1 June, no errors in syslog, such as 'hangcheck...', that I
could see. Mouse cursor would move normally however no applications could be
opened. Clock is frozen at the time of the freeze. Applications such as
Fetchmail, Procmail and Postfix continue to run as normal. I'm currently
running kernel 4.6.0-997-generic #201605222202 SMP Mon May 23 02:03:57 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux which I installed prior to this freeze. I'm
attaching two files. 1. The dmesg output after the freeze, before the reboot.
2. Entries in my syslog possibly dealing with this, I don't know for sure. The
file name is SRWatermark.txt

This line was added to my /etc/default/grub on 23 May -
GRUB_CMDLINE_LINUX_DEFAULT="drm.debug=14 plymouth:debug"

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