[Nouveau] [Bug 70895] New: BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292] after disable descrete card with switcheroo

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70895

          Priority: medium
            Bug ID: 70895
          Assignee: nouveau at lists.freedesktop.org
           Summary: BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292]
                    after disable descrete card with switcheroo
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mszpak at wp.pl
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 88154
  --> https://bugs.freedesktop.org/attachment.cgi?id=88154&action=edit
kernel log with stack trace

After disable discrete graphics with:
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

nouveau drivers seems to react:
kernel: [  113.072192] VGA switcheroo: switched nouveau off
Oct 26 16:07:52 localhost kernel: [  113.072208] ACPI Warning:
\_SB_.PCI0.PEGR.GFX0._DSM: Argument #4 type mismatch - Found [Buffer], ACPI
requires [Package] (20130517/nsarguments-95)
kernel: [  113.072350] nouveau  [     DRM] suspending fbcon...
kernel: [  113.072354] nouveau  [     DRM] suspending display...
kernel: [  113.072360] nouveau  [     DRM] unpinning framebuffer(s)...
kernel: [  113.072400] nouveau  [     DRM] evicting buffers...
kernel: [  113.085655] nouveau  [     DRM] waiting for kernel channels to go
idle...
kernel: [  113.085682] nouveau  [     DRM] suspending client object trees...
kernel: [  113.085976] nouveau  [     DRM] suspending kernel object tree...
kernel: [  113.865315] nouveau 0000:01:00.0: power state changed by ACPI to
D3cold

but xrandr --listproviders hangs the whole system with:
kernel: [  324.008068] BUG: soft lockup - CPU#0 stuck for 22s! [Xorg:1292]

Detailed log with stack trace attached.

System specification:
Asus N43SN
GeForce GT 550M + integrated Intel card using i915 driver (NVidia Optimus)
kernel-3.11.6-200.fc19.x86_64
xorg-x11-drv-nouveau-1.0.9-1.fc19.x86_64
xorg-x11-server-Xorg-1.14.3-1.fc19.x86_64

$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x8e cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
2 outputs: 4 associated providers: 2 name:Intel
Provider 1: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
crtcs: 2 outputs: 2 associated providers: 2 name:nouveau
Provider 2: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
crtcs: 2 outputs: 2 associated providers: 2 name:nouveau

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