Red Hat Bugzilla – Bug 839865
Nouveau DP-DVI connected monitor not detected after modeset
Last modified: 2013-02-13 07:51:30 EST
Created attachment 597969 [details]
dmesg from last working kernel version
Description of problem:
My primary display is an Nvidia card with a DP port and adapter to a DVI-connected monitor. It shows the BIOS POST and grub2 interfaces, but immediately after the nouveau drm driver starts, the monitor goes to sleep and is not detected by the kernel drm.
Version-Release number of selected component (if applicable):
Last known good: kernel-3.2.10-3.fc16.x86_64
Every update after fails, including: kernel-3.4.4-4.fc16.x86_64
Steps to Reproduce:
1. Boot newer kernel
2. See display turn off when drm initializes
Display goes to sleep and the Nvidia DP-1 port is listed as unconnected in xrandr.
Display shows kernel boot process and later the GDM prompt, with the Nvidia DP-1 port listed as connected.
I boot without the 'rhgb quiet' kernel command options. The display turns off right where you would normally see a change in the console font and the switch to plymouth.
I have a secondary radeon card installed. It is detected and initialized normally by both kernels.
Created attachment 597970 [details]
dmesg from 3.4.4-4 non-working kernel
BTW, this problem continues with the recent kernel-3.4.9-1.fc16.x86_64.
This problem continues with kernel-3.4.12-1.fc16.x86_64
I swapped the card for another NV50 unit that has a physical DVI port on it, and this works properly with kernel-3.4.12-1.fc16.x86_64.
I don't have many opportunities to disable this workstation for testing, but please let me know if there is any specific test/logging I can perform that would help isolate the bug further. In the meantime, I'll just use this other card so we can run updated kernels again...
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