Bug 121481
| Summary: | No video output after loading nouveau module | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Dmitrii Tcvetkov (demfloro) |
| Component: | Video(DRI - non Intel) | Assignee: | drivers_video-dri |
| Status: | CLOSED PATCH_ALREADY_AVAILABLE | ||
| Severity: | normal | CC: | demfloro, imirkin |
| Priority: | P1 | ||
| Hardware: | x86-64 | ||
| OS: | Linux | ||
| Kernel Version: | 4.7-rc6 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: |
dmesg for just modprobe nouveau
Xorg.0.log for modprobe nouveau dmesg for modprobe nouveau debug=trace Xorg.0.log for modprobe nouveau debug=trace lspci dmesg with reverted 6th patch from a8953c52b95167b5d21a66f0859751570271d834 |
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Created attachment 222101 [details]
Xorg.0.log for modprobe nouveau
Created attachment 222111 [details]
dmesg for modprobe nouveau debug=trace
Created attachment 222121 [details]
Xorg.0.log for modprobe nouveau debug=trace
Created attachment 222131 [details]
lspci
Did this ever work for you? Looks like DP link training fails. If it worked before, I would suspect commit a8953c52b95167b5d21a66f0859751570271d834 . It works good on kernel 4.6.3 and earlier, problem is since 4.7. I just tried to find conditions of the bug. I reverted patch "0006-drm-nouveau-disp-sor-gf119-both-links-use-the-same-training register" from commit a8953c52b95167b5d21a66f0859751570271d834 and nouveau loads about 1 second, screen does not become black. System behaves like on 4.6 kernel. Unfortunately I can't fully understand impact of this reversion on different video adapters. Can you send it to dri-devel mailing list? Created attachment 222141 [details]
dmesg with reverted 6th patch from a8953c52b95167b5d21a66f0859751570271d834
Ben has a better fix here: https://github.com/skeggsb/linux/commit/217215041b9285af2193a755b56a8f3ed408bfe2 Thank you, that fix helped. commit 1d110cf5d307bd52e826a2ceaa7daab83be61b7a Merge: cc23c61 39c8859 Author: Linus Torvalds <torvalds@linux-foundation.org> Date: Fri Jul 8 08:55:27 2016 -0700 |
Created attachment 222091 [details] dmesg for just modprobe nouveau OS: Arch Linux Video adapter: GeForce GTX 780 Ti Since 4.7 loading nouveau module results in black screen, but when I load nouveau module with parameter debug=trace the issue does not appear, screen successfully switches to correct resolution and Xorg can be successfully started. I did following: - after OS booting I issued command "modprobe nouveau", in this case execution of the command took about 44 seconds; - when "modprobe nouveau" returned control to shell I blindly issued command "startx" on terminal in VT; - after that machine was rebooted with "reboot" - after reboot I issued command "modprobe nouveau debug=trace", it took about 11 seconds to finish; - after that I issued "startx" and Xorg started sucessfully. If I compile nouveau module in kernel then I lose video output right after kernel loads if I don't pass nouveau.debug=trace parameter.