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From: Tino Keitel on 9 Jun 2010 14:00
Hi,

as of kernel 2.6.34 I sometimes get a strange hang during suspend to
RAM. After echo mem > /sys/power/state, the suspend script hangs, Xorg
eats 100% CPU, and the desktop is frozen. I can kill the script and the
computer will then suspend and resume fine. The kernel log shows
nothing interesting when the hang happens:

usblp0: removed
usbcore: deregistering interface driver dvb_usb_vp7045
dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
successfully deinitialized and disconnected.
PM: Syncing filesystems ... done.

Is this a known problem? I had rock stable suspend with 2.3.33.x. The
computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
compile a kernel with suspend debug to get more information if the hang
happens next time.

Regards,
Tino
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From: Rafael J. Wysocki on 9 Jun 2010 19:50
On Wednesday, June 09, 2010, Tino Keitel wrote:
> Hi,
>
> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
> RAM. After echo mem > /sys/power/state, the suspend script hangs, Xorg
> eats 100% CPU, and the desktop is frozen. I can kill the script and the
> computer will then suspend and resume fine. The kernel log shows
> nothing interesting when the hang happens:
>
> usblp0: removed
> usbcore: deregistering interface driver dvb_usb_vp7045
> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
> successfully deinitialized and disconnected.
> PM: Syncing filesystems ... done.
>
> Is this a known problem?

No, it's not.

> I had rock stable suspend with 2.3.33.x. The
> computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
> compile a kernel with suspend debug to get more information if the hang
> happens next time.

Yes, please try to get more information.

Rafael
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From: Michael Tokarev on 10 Jun 2010 02:10
10.06.2010 03:42, Rafael J. Wysocki пишет:
> On Wednesday, June 09, 2010, Tino Keitel wrote:
>> Hi,
>>
>> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
>> RAM. After echo mem> /sys/power/state, the suspend script hangs, Xorg
>> eats 100% CPU, and the desktop is frozen. I can kill the script and the
>> computer will then suspend and resume fine. The kernel log shows
>> nothing interesting when the hang happens:
>>
>> usblp0: removed
>> usbcore: deregistering interface driver dvb_usb_vp7045
>> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
>> successfully deinitialized and disconnected.
>> PM: Syncing filesystems ... done.

Sounds very much like the problem I have with 2.6.34 final. Did not
happen with 2.6.34-rc7 which suspended just fine, but happens quite
regularly on 2.6.34 final - not every suspend but each 2nd or 3rd
attempt. I stopped doing suspend-to-ram due to this, because it's
unreliable. Suspend-to-disk works just fine.

>> Is this a known problem?
>
> No, it's not.
>
>> I had rock stable suspend with 2.3.33.x. The
>> computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
>> compile a kernel with suspend debug to get more information if the hang
>> happens next time.

It's amd780g athlon-based machine here, with radeon graphics, also with KMS.

> Yes, please try to get more information.

Got it ;)

/mjt
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From: Tino Keitel on 10 Jun 2010 02:10
On Thu, Jun 10, 2010 at 10:05:05 +0400, Michael Tokarev wrote:

[...]

> Sounds very much like the problem I have with 2.6.34 final. Did not
> happen with 2.6.34-rc7 which suspended just fine, but happens quite

I also had this hang before -rc7.

Regards,
Tino
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From: Rafael J. Wysocki on 10 Jun 2010 11:50
On Thursday, June 10, 2010, Michael Tokarev wrote:
> 10.06.2010 03:42, Rafael J. Wysocki пишет:
> > On Wednesday, June 09, 2010, Tino Keitel wrote:
> >> Hi,
> >>
> >> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
> >> RAM. After echo mem> /sys/power/state, the suspend script hangs, Xorg
> >> eats 100% CPU, and the desktop is frozen. I can kill the script and the
> >> computer will then suspend and resume fine. The kernel log shows
> >> nothing interesting when the hang happens:
> >>
> >> usblp0: removed
> >> usbcore: deregistering interface driver dvb_usb_vp7045
> >> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
> >> successfully deinitialized and disconnected.
> >> PM: Syncing filesystems ... done.
>
> Sounds very much like the problem I have with 2.6.34 final. Did not
> happen with 2.6.34-rc7 which suspended just fine, but happens quite
> regularly on 2.6.34 final - not every suspend but each 2nd or 3rd
> attempt. I stopped doing suspend-to-ram due to this, because it's
> unreliable. Suspend-to-disk works just fine.

Well, it would be helpful to check which commit between 2.6.34-rc7 and
2.6.34 final broke that for you (there were not too many commits between these
two kernels, so it shouldn't be too much work).

> >> Is this a known problem?
> >
> > No, it's not.
> >
> >> I had rock stable suspend with 2.3.33.x. The
> >> computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
> >> compile a kernel with suspend debug to get more information if the hang
> >> happens next time.
>
> It's amd780g athlon-based machine here, with radeon graphics, also with KMS.
>
> > Yes, please try to get more information.
>
> Got it ;)

That still doesn't really help to diagnose the problem.

Rafael
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