Comment 5 for bug 912387
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| Bryce Harrington (bryce) wrote Re: Intel graphics stack regression (oneiric->precise) with external displayport monitor | #5 |
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35a32c5
(Get the code!)
The lightdm resolution issue is probably bug #874241.
The blank screen after the modeswitch with DP sounds like in some situations it's bring up the external monitor on a different CRTC than the one X is sending graphics to.
Please enable modesetting debug messages. Run 'sudo xdiagnose', it's the first checkbox. Click Apply, wait for it to rebuild the bootloader, then reboot and reproduce the bug. Then switch to a vt or ssh into the box and collect 'sudo dmesg > dmesg.txt' and attach that here. This will give more details about how it's selecting modes and crtcs during the modeswitch.
Fwiw, upstream has recently been doing some work on sorting out some DP problems. We'll be updating the X stack hopefully in the next week or two, which may bring in some of those fixes. We have the stack in a staging PPA you could try if you're interested in testing it.