[Nouveau] [Bug 70895] 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

--- Comment #2 from Marcin Zajaczkowski <mszpak at wp.pl> ---
Hello again. I upgraded my system to Fedora 21 and with 3.17.3-300.fc21.x86_64
I cannot reproduce mentioned issue (with "CPU#0 stuck for 22s").

Unfortunately I have problem with switching a discrete card. By default:
# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
does nothing - a discrete card is still in DynPwr state:

$ $ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynPwr:0000:01:00.0

Booting with nouveau.runpm=0 I have both cards on:
$ $ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Pwr:0000:01:00.0

and after
# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

I have:
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0

Looks ok, but I still see 3 providers:
$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x90 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
3 outputs: 5 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

and system temperature could suggest that the card is still on. I see no
messages from VGA switcheroo in the system log (as there were in 3.11.6).

When I use (on the second kernel) bbswitch with bumblebee I see only one
provider and the temperature is a few (~6) degrees lower.

Should I close that issue and report another issue?

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