[Nouveau] [Bug 90390] New: [NV98] Modesetting causes blank screen because of INVALID_STATE [UNK0B] chid 1 mthd 0x0080 data 0x00000000

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90390

            Bug ID: 90390
           Summary: [NV98] Modesetting causes blank screen because of
                    INVALID_STATE [UNK0B] chid 1 mthd 0x0080 data
                    0x00000000
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: analizer at yandex.ru
        QA Contact: xorg-team at lists.x.org

Environment:
Video card: GeForce 9300M GS (laptop)
Kernel: 4.0.2-gentoo

Steps to reproduce:
1. Boot
2. modprobe drm_kms_heloper
3. modprobe nouveau

Expected result:
Framebuffer initialization
Actually after dozen attempts I had framebuffer initialized once, background
was red, foreground was black and I never was able to achieve this again.

Actual result:
Blank screen. Still able to process keyboard input, so kernel log can be
gathered and system can be safely rebooted.

Results with various parameters:
With `nouveau.noaccel=1` I'm getting black screen instead of blank screen and
system is not responsive to keyboard input.
With `nouveau.modeset=0` nothing happens after `modprobe nouveau`, this makes
me think this is a modesetting issue.

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