linux-kernel - Re: 4.3 nouveau regression: nv04_fbcon

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Date:	Fri, 27 Nov 2015 16:14:01 +0200 (EET)
From:	Meelis Roos <mroos@...ux.ee>
To:	Ilia Mirkin <imirkin@...m.mit.edu>
cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	David Airlie <airlied@...ux.ie>,
	Ben Skeggs <bskeggs@...hat.com>
Subject: Re: 4.3 nouveau regression: nv04_fbcon_imageblit(?) deadlock

> > 4.2.0 (both packaged and self-compiled) worked fine, 4.3.0 and 4.4-rc2
> > exhibit a problem: after the system has started up, I start getting
> > messages like INFO: task kworker/0:2:652 blocked for more than 120
> > seconds. where nv04_fbcon_imageblit and nouveau_pmops_runtime_suspend
> > show up in trace. The trace keeps reappearing, also breaking lspci and
> > clean reboot (they hang).
> >
> > dmesg from 4.4-rc2, drm-debug=0xe
> > http://kodu.ut.ee/~mroos/download/dm-nouveau-4.4-rc2
> >
> > dmesg from 4.2.0, drm.debug=0xe
> > http://kodu.ut.ee/~mroos/download/dm-nouveau-4.2
> >
> > lspci -vvv
> > http://kodu.ut.ee/~mroos/download/lspci.nouveau
> >
> > config:
> > http://kodu.ut.ee/~mroos/download/nouveau-config
> >
> > Is there anything else I can provide?
> 
> Runtime pm shouldn't be a thing for these GPUs... can you see if
> booting with nouveau.runpm=0 fixes it? Sounds like we reintroduced
> some problem for GPUs that don't have optimus-style acpi power off
> hooks.

Yes, nouveau.runpm=0 makes the hang go away, and reboot and lspci also 
started working without hangs.

-- 
Meelis Roos (mroos@...ux.ee)
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