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

[faginbagin]

On 1/6/2015 10:21 AM, Matt Garman 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?
> 
> Thanks!

If you are using xfce as your desktop environment, the symptoms you are seeing might be explained by this bug:
https://bugzilla.xfce.org/show_bug.cgi?id=11107
Although many people reporting the problem have nvidia cards, I hit it using an ivybridge core i3's IGP.

HTH,
Helen