Video Freeze

[Tommy Trussell]

On Sun, Jun 26, 2016 at 3:24 PM, Chris <cpollock at embarqmail.com> wrote:

> I experienced a video freeze this afternoon running 14.04.4 LTS with the
> kernel shown in my sig. Some trace information was inserted into my
> syslog which I've put up on Pastebin and can be downloaded here -
> https://pastebin.com/d2Kp7vQ3 can anyone tell me what this might mean
> and is it related to a video freeze in which the clock is frozen, the
> mouse cursor will move but I can't switch between desktops however all
> background processes, fetchmail, procmail, Spamassassin and others
> continue to run.
>
> Thanks
> Chris
>
> --
> Chris
> KeyID 0xE372A7DA98E6705C
> 31.11°N 97.89°W (Elev. 1092 ft)
> 15:19:18 up 2:12, 1 user, load average: 0.81, 0.64, 0.56
> Ubuntu 14.04.4 LTS, kernel 4.4.0-24-generic #43~14.04.1-Ubuntu SMP Thu
> Jun 9 09:46:12 UTC 2016
>
>
I have had similar freezes in the past few weeks, but only after I
installed the HWE kernel / "LTS Enablement Stack"
https://wiki.ubuntu.com/Kernel/LTSEnablementStack -- which on my system
installed the 4.2.0-38 generic kernel -- SO I presume some sort of
strangeness with the kernel and video driver or something, and it might be
very difficult to blame the bug on the kernel, the video driver, or the
application that froze the display.

Note that after doing this, I am no longer running a "pure" 14.04 LTS
"Trusty" setup, AND neither are you -- in fact your kernel is newer than
mine -- it's a Xenial kernel.

In my case the freezes have occurred only when running Chromium with a
YouTube video set at full screen. The first thing you might want to check
(if you're using Google Chrome or Chromium) is to go into the Advanced
settings and make sure "Use hardware acceleration when available" is turned
OFF.

Now my system freezes only when the video is full screen, fairly long (like
an hour) and only after I have been watching it for more than a few
minutes. I figure the decreased circumstances are an improvement, but not
worth complaining about since I'm no longer running a "pure" LTS system.

Since you're running the Xenial kernel anyway, maybe it's time to consider
doing a full upgrade to Ubuntu 16.04 "Xenial" and seeing if the freezes
improve. If it doesn't improve, you may be able to better find a relevant
bug to sign on to because when you are running a more standard setup.

I would suggest looking for bugs related to the GUI applications that
happen to be running when your system freezes (including any screen
savers), and also check for reports regarding the graphics display driver
for your video card.
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