[mythtv-users] X11 freeze after screen blanking with Haswell mobile

[Karl Newman]

On Tue, Jan 6, 2015 at 8:12 AM, Karl Newman <newmank1 at asme.org> wrote:

>
> On Tue, Jan 6, 2015 at 7:21 AM, Matt Garman <matthew.garman at gmail.com>
> wrote:
>
>> I just rebuilt my frontend-only machine using an Intel NUC D54250wyk.
>> This uses an i5-4250U CPU, with integrated HD graphics 5000.  My
>> understanding is that this is basically a laptop Haswell CPU/GPU.
>>
>> I'm running CentOS 6.6 and MythTV 0.27.4 from scrpms.  Everything
>> works fine except that after the screen blanks due to inactivity,
>> about 65% of the time, the screen is completely frozen.
>>
>> I'm not using any screensaver, just letting Xorg do the blanking.
>> When the screen is frozen, I can still move the mouse cursor around.
>> But I can't see anything else on the screen.  The workaround is to
>> explicitly kill the X server (Ctrl-Alt-Backspace), then re-launch
>> mythfrontend.
>>
>> Another curious thing I've noticed: some of the time, when the screen
>> is frozen like this, it's not black, but frozen on a frame (i.e. still
>> image) from something we recently watched!  At first I thought it was
>> my kids playing with the remote, but we started keeping the remote out
>> of their reach, and it's still happening.
>>
>> A final note: I usually start mythfrontend from a terminal.  Most
>> people have noticed, in X, the mouse pointer is a little arrow, but
>> when you mouse over a focused terminal window (xterm), then the mouse
>> pointer turns into a cursor (looks kind of like a capital "I").  When
>> the screen is in this frozen mode, and I hit "Alt-Tab" (to switch from
>> mythfrontend to xterm), and I mouse over to where I know the terminal
>> is, I see the cursor shape change.  So it's almost as if X is
>> functioning correctly, just not updating the display.  I also don't
>> see any errors in myth's log or in the Xorg log, so that also suggests
>> to me that the driver/hardware "thinks" everything is OK.
>>
>> Anyone seen anything like this?  Any thoughts on how to fix it?
>>
>> I've seen similar behavior with my Sandy Bridge i3-2120T with Gentoo.
> However, I use xscreensaver to show a slideshow of photos and it will
> freeze the last photo displayed. The occurrence is more like once every day
> or two, not as frequently as yours. My impression was that it was a problem
> with xscreensaver because it seemed to start happening after an update of
> that package (just a guess/feeling). If I hit a few exit-type buttons on
> the remote (I have one mapped to a script which will kill -9 mythfrontend)
> including the End button to exit MythWelcome, it will eventually (10
> seconds?) exit the X server and then my loop in .bash_profile will restart
> X and then mythfrontend. It may be a bug with the xf86-video-intel driver,
> because on the Bay Trail frontend I just built I encountered an apparent
> driver bug triggered which crashed X when MythFrontend started. I solved
> that by upgrading to the xf86-video-intel version 2.99.916. On my main
> frontend (the Sandy Bridge) I recently downgraded xscreensaver and am
> waiting to see if that fixes it (but even if it does it doesn't rule out a
> driver bug). Similar to you, I haven't seen any errors in any of the logs
> around the time the freeze seems to happen.
>
> Just to follow up on this--after I downgraded xscreensaver I still got a
freeze, so I upgraded my main frontend (Sandy Bridge) to xf86-video-intel
version 2.99.917. I'll see if that fixes it.

Karl
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