[Intel-gfx] Video freezes continue

[Chris]

I'm still continuing to experience video lockups though not quite as
frequent as before. The most recent was 12 August. I'm running the
kernel as shown in my sig. I've attached my Xorg.0.log. I'm able to SSH
into my desktop from my tablet and running
cat /sys/class/drm/card0/error shows 'no error state collected'. Running
cat /sys/kernel/debug/dri/0/i915_swizzle_info outputs

bit6 swizzle for X-tiling = none
bit6 swizzle for Y-tiling = none
DDC = 0x00200010
DDC2 = 0x00300030
C0DRB3 = 0x0030
C1DRB3 = 0x0010

This has been going on for a few months less than a year now. When this
happens the video is frozen however the mouse cursor will continue to
move and all background processes such as fetchmail, procmail, postfix
and all cronjobs continue running. 

This is a Dell Optiplex 780 with BIOS A15 4gb of ram. Periodically this
would show in the syslog about the same time as the freeze 

Jul 28 16:02:28 localhost kernel: [793861.820048]
[drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed...
render ring idle

The above was the last time the 'Hangcheck' error was noted. I'm running
Gnome 3.12.2 and Ubuntu 14.04.3 LTS

Any advice will be appreciated.

Chris

-- 
Chris
KeyID 0xE372A7DA98E6705C
31.11°N 97.89°W (Elev. 1092 ft)
16:55:17 up 3 days, 10:12, 1 user, load average: 0.78, 0.51, 0.45
Ubuntu 14.04.3 LTS, kernel 4.0.0-997-generic #201503310205 SMP Tue Mar
31 02:07:04 UTC 2015
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