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

[bugzilla-daemon@bugzilla.kernel.org]

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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