[bisected] nouveau: "Failed to idle channel x" after resume

[Maxim Levitsky]

On Mon, 2012-08-13 at 18:22 +0200, Sven Joachim wrote: 
> On 2012-08-08 08:18 +0200, Sven Joachim wrote:
> 
> > On 2012-08-08 08:08 +0200, Ben Skeggs wrote:
> >
> >> On Wed, Aug 08, 2012 at 08:00:21AM +0200, Sven Joachim wrote:
> >>> 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?
> >
> > Nothing interesting:
> >
> > ,----
> > | Aug  8 07:49:16 turtle kernel: [   89.655362] nouveau  [     DRM][0000:01:00.0] suspending fbcon...
> > | Aug  8 07:49:16 turtle kernel: [   89.655367] nouveau  [     DRM][0000:01:00.0] suspending display...
> > | Aug  8 07:49:16 turtle kernel: [   89.696888] nouveau  [     DRM][0000:01:00.0] unpinning framebuffer(s)...
> > | Aug  8 07:49:16 turtle kernel: [   89.696909] nouveau  [     DRM][0000:01:00.0] evicting buffers...
> > | Aug  8 07:49:16 turtle kernel: [   89.696913] nouveau  [     DRM][0000:01:00.0] suspending client object trees...
> > `----
> >
> >> 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.
> >
> > Thanks, I'll try them when they are available.
> 
> With current nouveau master ("drm/nouveau: fix find/replace bug in
> license header") suspending works again, thanks!  However, it is a bit
> slow, taking between two and five seconds:
> 
> ,----
> | Aug 13 18:17:56 turtle kernel: [  678.524814] PM: Syncing filesystems ... done.
> | Aug 13 18:18:09 turtle kernel: [  678.639202] Freezing user space processes ... (elapsed 0.01 seconds) done.
> | Aug 13 18:18:09 turtle kernel: [  678.649954] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
> | Aug 13 18:18:09 turtle kernel: [  678.663298] Suspending console(s) (use no_console_suspend to debug)
> | Aug 13 18:18:09 turtle kernel: [  678.680884] sd 0:0:0:0: [sda] Synchronizing SCSI cache
> | Aug 13 18:18:09 turtle kernel: [  678.681000] sd 0:0:0:0: [sda] Stopping disk
> | Aug 13 18:18:09 turtle kernel: [  678.695141] parport_pc 00:07: disabled
> | Aug 13 18:18:09 turtle kernel: [  678.695204] serial 00:06: disabled
> | Aug 13 18:18:09 turtle kernel: [  678.695209] serial 00:06: wake-up capability disabled by ACPI
> | Aug 13 18:18:09 turtle kernel: [  678.695235] nouveau  [     DRM][0000:01:00.0] suspending fbcon...
> | Aug 13 18:18:09 turtle kernel: [  678.695239] nouveau  [     DRM][0000:01:00.0] suspending display...
> | Aug 13 18:18:09 turtle kernel: [  678.742111] nouveau  [     DRM][0000:01:00.0] unpinning framebuffer(s)...
> | Aug 13 18:18:09 turtle kernel: [  678.742189] nouveau  [     DRM][0000:01:00.0] evicting buffers...
> | Aug 13 18:18:09 turtle kernel: [  682.357319] nouveau  [     DRM][0000:01:00.0] suspending client object trees...
> | Aug 13 18:18:09 turtle kernel: [  683.526646] PM: suspend of devices complete after 4863.181 msecs
> `----
> 
> With the 3.4.8 kernel, suspending takes little more than one second.
> 
> Cheers,
>        Sven
I confirm exactly the same thing.

Here suspend takes more that 10 seconds:

[ 2165.363878] nouveau  [     DRM][0000:01:00.0] suspending fbcon...
[ 2165.363885] nouveau  [     DRM][0000:01:00.0] suspending display...
[ 2165.475791] sd 0:0:0:0: [sda] Stopping disk
[ 2166.396877] nouveau  [     DRM][0000:01:00.0] unpinning
framebuffer(s)...
[ 2166.396926] nouveau  [     DRM][0000:01:00.0] evicting buffers...
[ 2174.809084] nouveau  [     DRM][0000:01:00.0] suspending client
object trees...
[ 2177.950222] nouveau 0000:01:00.0: power state changed by ACPI to D3


Best regards,
Maxim Levitsky