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 some 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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