Created attachment 88154 [details]
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