[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 #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Marcin Zajaczkowski from comment #2)
> 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:

That's expected. What's unexpected is that something is keeping a reference to
your GPU which isn't letting it power off. Similar to bug #70875.

> 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).

That is odd... not sure what that situation is.

> Should I close that issue and report another issue?

Yes, don't confuse multiple issues into one, it gets unwieldy.

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