[Intel-gfx] external screen goes black

[Jonathan Adamczewski]

Thanks for the reply, Daniel.

Full traces are attached. I booted the system, ran dmesg after logging in
through kdm.

(Then I left the system while doing some other errands, hence the gap in
time)

I then started firefox, went to youtube and started watching some 4K
resolution videos. The external screen went black in less than a minute.
Second file is dmesg run after that - there doesn't appear to be much to
see...

There was nothing in dmesg that correlated directly with the screen going
black. I've validated this by triggering the screen going black several
times (that's not in the attached log, though) - there was never anything
in dmesg that happened at the same time or that happened for tens of
seconds thereafter.


What's the next step for gathering information here?

Many thanks

Jonathan.





On Sat, Jan 19, 2013 at 5:39 PM, Daniel Vetter <daniel at ffwll.ch> wrote:

> Hi Jonathan,
>
> Can you please boot with drm.debug=0xe and then attach the complete
> dmesg once right after boot, and once after the screen went black?
>
> Thanks, Daniel
>
> On Sun, Jan 20, 2013 at 1:38 AM, Jonathan Adamczewski
> <jonathan.adamczewski at gmail.com> wrote:
> > Hardware is a Dell XPS laptop, xorg log reports "Integrated Graphics
> > Chipset: Intel(R) Sandybridge Mobile (GT2)"
> >
> > Running a custom configured 3.7.2 based kernel, xf86-video-intel-2.20.17.
> >
> > I'm running the internal LVDS screen at 1080p and a Dell 2713HM monitor
> at
> > 2560x1440 connected via display port.
> >
> > Both screens run fine when X starts, but at some point the external
> monitor
> > will go black. The system doesn't recognize it as being disconnected - no
> > KDE popup asking if I want to change the monitor config as happens when
> > pulling the DP or power on the monitor.
> >
> > Sometimes it will return to life after a short amount of time, most of
> the
> > time it stays black indefinitely. A full power cycle of the monitor
> (pulling
> > the plug) will usually bring it back to life, but typically not for long.
> >
> > The screen usually goes black while there's a high degree of display
> > activity - a video playing, moving large windows around the screen,
> looking
> > around in google streetview, etc. It doesn't seem to matter which screen
> the
> > activity is on.
> >
> > It *seems* to be less likely if I run the external display at a lower
> > resolution.
> >
> > There's nothing that coincides with the screen going black in dmesg or
> the
> > xorg log.
> >
> > I've had no problems with this monitor under Windows 7 (gaming, videos,
> > etc).
> >
> > What I'm looking for: ideally a simple fix :) Otherwise, any suggestions
> > about where to look to gather more information on what could be happening
> > here - or other places to ask for help.
> >
> > Many thanks
> >
> > jonathan.
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
>
>
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch
>
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