linux-kernel - Re: [bisected] nouveau: "Failed to idle channel x" after resume

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Date:	Wed, 8 Aug 2012 16:08:41 +1000
From:	Ben Skeggs <skeggsb@...il.com>
To:	Sven Joachim <svenjoac@....de>
Cc:	Maxim Levitsky <maximlevitsky@...il.com>,
	Aioanei Rares <krnl.list@...il.com>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	Martin Nyhus <martin.nyhus@....com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [bisected] nouveau: "Failed to idle channel x" after resume

On Wed, Aug 08, 2012 at 08:00:21AM +0200, Sven Joachim wrote:
> On 2012-08-08 07:37 +0200, Ben Skeggs wrote:
> 
> > On Mon, Aug 06, 2012 at 11:38:04PM +0300, Maxim Levitsky wrote:
> >> On Sat, 2012-08-04 at 17:41 +0300, Maxim Levitsky wrote: 
> >> > On Mon, 2012-07-23 at 18:25 +0300, Aioanei Rares wrote: 
> >> > > On Thu, Jul 5, 2012 at 11:24 PM, Martin Nyhus <martin.nyhus@....com> wrote:
> >> > > >
> >> > > > On Mon, 11 Jun 2012 23:18:42 +0200 Martin Nyhus wrote:
> >> > > > > after resuming from suspend nouveau starts writing Failed to idle
> >> > > > > channel x (where x is 2 or 3) to the log and X appears to stop and
> >> > > > > then restart only to stop again. Starting Firefox after resuming
> >> > > > > triggers the bugs every time, and bisecting leads to 03bd6efa
> >> > > > > ("drm/nv50/fifo: use hardware channel kickoff functionality").
> >> > > >
> >> > > > Hi Ben,
> >> > > > I'm still seeing this bug with the latest from Linus
> >> > > > (v3.5-rc5-98-g9e85a6f) and linux-next (next-20120705).
> >> > > >
> >> > > > lspci output:
> >> > > > 01:00.0 VGA compatible controller: nVidia Corporation G86 [GeForce
> >> > > > 8400M GS] (rev a1)
> >> > > >
> >> > > > Sorry I haven't followed up on this earlier,
> >> > > > Martin
> >> > > 
> >> > > I can confirm this with 3.5.0, Chromium and Arch Linux. It's a HP
> >> > > Pavilion laptop with a G86 [GeForce 8400 M GS] video card .
> >> > > Seems related to this bug:
> >> > > http://lists.freedesktop.org/archives/nouveau/2011-January/007358.html
> >> > > . If I can do anything else
> >> > > to help, I will be glad to.
> >> > Added nouveau@...ts.freedesktop.org>
> >> > 
> >> > I confirm the same issue here.
> >> > will try to do dig it.
> >> Nope,can't dig this :-(
> > Interestingly, this works just fine for me after the driver rework.
> 
> Not for me on my GeForce 8500 GT, and I still cannot suspend more than
> once, subsequent attempts fail:
> 
> ,----
> | Aug  8 07:49:16 turtle kernel: [   91.697068] nouveau W[  PGRAPH][0000:01:00.0][0x0200502d][ffff880037be1d40] parent failed suspend, -16
> | Aug  8 07:49:16 turtle kernel: [   91.697078] nouveau  [     DRM][0000:01:00.0] resuming display...
> `----
Interesting.  Were there any messages prior to that?  I guess the the fifo
code detected a timeout when trying to save the graphics context, I have
I have other patches in my tree (I'll push them soon, tied up with other
work atm) that might help here.

> 
> > I can confirm issues on G86 with 3.5/3.6-rc1 stock though.  I'll
> > attempt to find a fix suitable for the non-reworked driver.
> 
> Thanks.  I'm currently stuck on 3.4 because of this problem.
Sorry about that!

Ben.

> 
> Cheers,
>        Sven
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