[Nouveau] [Bug 87983] New: nouveau E[Xorg.bin[1119]] failed to idle channel 0xcccc0001 on G86 [GeForce 8500 GT] (rev a1)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87983

            Bug ID: 87983
           Summary: nouveau E[Xorg.bin[1119]] failed to idle channel
                    0xcccc0001 on G86 [GeForce 8500 GT] (rev a1)
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: bofh666 at gmx.at
        QA Contact: xorg-team at lists.x.org

Created attachment 111673
  --> https://bugs.freedesktop.org/attachment.cgi?id=111673&action=edit
output of dmesg

After booting a system with Fedora 21 the screen does not switch to graphics
mode on start of kde and keeps displaying the last lines of the text mode boot
log.
Switching to a text console using alt-Fn key combinations does not work.
System is otherwise working, using ssh to log in remotely works.

Last line from noueveau in dmesg shows it failed in nouveau_channel_idle:
[   54.068008] nouveau E[Xorg.bin[1119]] failed to idle channel 0xcccc0001
[Xorg.bin[1119]]

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