[Bug 121481] New: No video output after loading nouveau module

[Bug 121481] New: No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

            Bug ID: 121481
           Summary: No video output after loading nouveau module
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.7-rc6
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: demfloro@demfloro.ru
        Regression: No

Created attachment 222091
  --> https://bugzilla.kernel.org/attachment.cgi?id=222091&action=edit
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.

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |demfloro@demfloro.ru

--- Comment #1 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 222101
  --> https://bugzilla.kernel.org/attachment.cgi?id=222101&action=edit
Xorg.0.log for modprobe nouveau

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

--- Comment #2 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 222111
  --> https://bugzilla.kernel.org/attachment.cgi?id=222111&action=edit
dmesg for modprobe nouveau debug=trace

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

--- Comment #3 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 222121
  --> https://bugzilla.kernel.org/attachment.cgi?id=222121&action=edit
Xorg.0.log for modprobe nouveau debug=trace

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

--- Comment #4 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 222131
  --> https://bugzilla.kernel.org/attachment.cgi?id=222131&action=edit
lspci

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

Ilia Mirkin <imirkin@alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |imirkin@alum.mit.edu

--- Comment #5 from Ilia Mirkin <imirkin@alum.mit.edu> ---
Did this ever work for you?

Looks like DP link training fails. If it worked before, I would suspect commit
a8953c52b95167b5d21a66f0859751570271d834 .

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

--- Comment #6 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
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?

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

--- Comment #7 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 222141
  --> https://bugzilla.kernel.org/attachment.cgi?id=222141&action=edit
dmesg with reverted 6th patch from a8953c52b95167b5d21a66f0859751570271d834

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

--- Comment #8 from Ilia Mirkin <imirkin@alum.mit.edu> ---
Ben has a better fix here:

https://github.com/skeggsb/linux/commit/217215041b9285af2193a755b56a8f3ed408bfe2

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|CODE_FIX                    |PATCH_ALREADY_AVAILABLE

--- Comment #9 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Thank you, that fix helped.

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[Bug 121481] No video output after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121481

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #10 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
commit 1d110cf5d307bd52e826a2ceaa7daab83be61b7a
Merge: cc23c61 39c8859
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri Jul 8 08:55:27 2016 -0700

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