[Nouveau] [Bug 55412] New: Screen turns black during boot after driver tries to set mode on NV50

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55412

          Priority: medium
            Bug ID: 55412
          Assignee: nouveau at lists.freedesktop.org
           Summary: Screen turns black during boot after driver tries to
                    set mode on NV50
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: lubosz at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 67816
  --> https://bugs.freedesktop.org/attachment.cgi?id=67816&action=edit
kernel log without flags

The following commit on current nouveau git master breaks setting a valid
resolution at boot and results in a black screen.

commit 97d6852410a83e413d85649cb2cc10e17d6ee2ab
Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Thu Jul 26 08:51:21 2012 +1000

    drm/nouveau/acpi: move definitions out of nouveau_drv.h

    Signed-off-by: Ben Skeggs <bskeggs at redhat.com>

An interesting thing about this bug is that it can be avoided with adding the
kernel flag nouveau.reg_debug=0x600. With this flag a wrong resolution is set
at boot and the screen does not turn black. The X Server cannot start anyway.

My native resolution is 1366x768. GRUB_GFXMODE is 1360x768x32, since the
greater resolution is not listed in grub's vbeinfo.
nouveau and blob run X with 1366x768.

I will attach a log with and without the flag at commit
97d6852410a83e413d85649cb2cc10e17d6ee2ab.

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