[Intel-gfx] external screen goes black

[Daniel Vetter]

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.
>
> _______________________________________________
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> Intel-gfx at lists.freedesktop.org
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>



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch