Comment 6 for bug 912387
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| Roland Dreier (roland.dreier) wrote Re: Intel graphics stack regression (oneiric->precise) with external displayport monitor | #6 |
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1b1ed1a
(Get the code!)
So xdiagnose doesn't work for me (I seem to hit bug #903484) but I added "drm.debug=0xe" to my kernel command line by hand, and got the following output.
This is not exactly the scenario described above -- I actually booted up at home away from my dock, suspended the laptop, came to work, and resumed in the dock. I had exactly the same situation that my external monitor wouldn't light up though, and I went through my (now-standard) workaround dance of:
- log into text kernel and do xrandr --output LVDS1 --auto to turn on the laptop screen
- light up the DP monitor at 1024x768
- switch the DP monitor to 2560x1440 at the same time as I turn off the laptop screen
and I now have my X session working at native resolution on my external monitor.