[Intel-gfx] Video freezing after activating XScreensaver

[Daniel Vetter]

On Tue, Oct 13, 2015 at 02:51:25PM -0500, Chris wrote:
> On Tue, 2015-10-13 at 17:30 +0200, Daniel Vetter wrote:
> > On Tue, Oct 13, 2015 at 08:56:52AM -0500, Chris wrote:
> > > This is an issue that has been ongoing for over 1 1/2 years now. I have
> > > tried kernel after kernel and whether it's a Ubuntu kernel such as the
> > > one in my sig or a kernel from here -
> > > http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/ the video
> > > will intermittently freeze. Running XScreensaver causes it to freeze
> > > when switching between the different screen savers showing a black
> > > screen and the mouse cursor. The cursor can be moved and will switch
> > > between the arrow and the hand tool if hovering over a clickable area on
> > > the desktop even though it can't be seen. Giving an error output in my
> > > syslog of 
> > > 
> > > kernel: [578631.820045] [drm:i915_hangcheck_elapsed [i915]] *ERROR*
> > > Hangcheck timer elapsed... render ring idle
> > 
> > Known problem and we never managed to fix it. The first time it happens a
> > workaround should kick in, which should prevent any future freezes (until
> > you reboot at least).
> > 
> > If freezes still happen after that there's another bug on top.
> > -Daniel
> > 
> Thanks for the reply Daniel, and there entails the problem. Once the
> video freezes you have no idea if the 'workaround' kicked in or not. I
> can SSH in via my tablet since all the system is still active. That's
> the only way I can effectively capture any log files and reboot. The
> 'Hangcheck...' error only seems to appear if I start XScreensaver
> running at other times the video will freeze with no errors noted at
> all. 

In that case it seems unrelated to the error in dmesg. No idea what's
happening on your system - hangcheck is rather reliable at figuring out
there's a stuck gpu somewhere. If it doesn't fire the gpu should be all
fine and the stall happens somewhere else.
-Daniel
> 
> > > 
> > > I was able to reproduce this yesterday by starting XScreensaver at
> > > 9:43am and at 13:44pm the video froze giving the above error. At other
> > > times when XScreensaver is not running the video will still randomly
> > > freeze however there is no specific time frame for this to happen. I've
> > > seen it go 2 days then freeze and have also seen it go 16 days then
> > > freeze. As I've said previously all background operations continue to
> > > run as just the video is frozen.
> > > 
> > > I have had the random freeze happen when running this kernelkernel
> > > 4.0.0-997-generic #201503310205 SMP Tue Mar
> > > 31 02:07:04 UTC 2015 which Chris Wilson from this list had me run kernel
> > > kernel 4.0.0-997-generic #201503310205 SMP Tue Mar
> > > 31 02:07:04 UTC 2015 however when I attempted to file a bug report at
> > > Ubuntu Launchpad it was not accepted so the Ubuntu kernel folks had me
> > > switch to kernel 4.2.3-040203-generic #201510030832 SMP Sat Oct 3
> > > 12:34:31 UTC 2015 which although is an upstream kernel is what they
> > > wanted me to run. The bug report that I've filed on Launchpad is
> > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1497627 
> > > 
> > > I've attempted to boot into the following Ubuntu upstream kernels:
> > > 
> > > v4.3-rc5-unstable - Boot process would begin but would not complete
> > > v4.3-rc4-unstable - same as above
> > > v4.3-rc3-unstable - same as above
> > > v4.3-rc2-unstable - Same as above
> > > v4.3-rc1-unstable - Same as above
> > > 
> > > I also attempted last night to boot into
> > > 
> > > v4.3-rc5-unstable from
> > > http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D which gave the
> > > same results. The boot process would begin but then go to just a black
> > > screen without completing. 
> > > 
> > > I have either filed or commented on the following bugs also:
> > > 
> > > https://bugs.freedesktop.org/show_bug.cgi?id=75394
> > > https://bugs.freedesktop.org/show_bug.cgi?id=89290
> > > https://bugs.freedesktop.org/show_bug.cgi?id=91495
> > > 
> > > System info is:
> > > 
> > > Dell Optiplex 780
> > > Bios A15
> > > Ubuntu 14.04.3 LTS
> > > Gnome 3.12.2
> > > 
> > > Am I still the only one who is experiencing this issue? 
> > > -- 
> > > Chris
> > > KeyID 0xE372A7DA98E6705C
> > > 31.11°N 97.89°W (Elev. 1092 ft)
> > > 07:57:25 up 11:34, 1 user, load average: 0.37, 0.41, 0.33
> > > Ubuntu 14.04.3 LTS, kernel 4.2.3-040203-generic #201510030832 SMP Sat
> > > Oct 3 12:34:31 UTC 2015
> > > 
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx at lists.freedesktop.org
> > > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> > 
> 
> -- 
> Chris
> KeyID 0xE372A7DA98E6705C
> 31.11°N 97.89°W (Elev. 1092 ft)
> 14:45:43 up 18:22, 1 user, load average: 0.49, 0.24, 0.17
> Ubuntu 14.04.3 LTS, kernel 4.2.3-040203-generic #201510030832 SMP Sat
> Oct 3 12:34:31 UTC 2015
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch