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From: Bill Davidsen on 10 Jun 2010 17:20
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.
>
>>> Is this a known problem?
>>
There are two things you can try if you wish, one is to go the text console
before suspend, the other is to run your system in VESA video mode (assuming you
are a lucky person and any other mode is supported).

I'm not running on 2.6.34 for production (2.6.33.5) but I did try when it first
came out, and saw some issues there.

>> 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


--
Bill Davidsen <davidsen(a)tmr.com>
"We have more to fear from the bungling of the incompetent than from
the machinations of the wicked." - from Slashdot

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From: Rafael J. Wysocki on 13 Jun 2010 07:10
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.

Can you both try to do "echo 0 > /sys/power/pm_async" and check if suspend
works with that?

Rafael
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From: Maciej Rutecki on 14 Jun 2010 10:50
On środa, 9 czerwca 2010 o 19:53:56 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:
>

I created a Bugzilla entry at
https://bugzilla.kernel.org/show_bug.cgi?id=16207
for your bug report, please add your address to the CC list in there, thanks!

--
Maciej Rutecki
http://www.maciek.unixy.pl
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From: Tino Keitel on 21 Jun 2010 18:30
Hi,

another observation:

As the the computer suspends if I kill the hanging suspend script, I
tried to see that the suspend script is doing. So I attached strace to
it:

$ strace -f -p 6652

After this, the computer suspended.

Regards,
Tino
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From: Tino Keitel on 23 Jun 2010 16:40
On Mon, Jun 21, 2010 at 18:31:57 -0400, Alan Stern wrote:

[...]

> Why does this look like a USB problem? As far as I can tell, the bug
> is that the system delays somewhere during the suspend procedure. But
> there's no reason to think the delay is connected with USB.

Breaking news: I just got the same hang when switching from X to the
console, so I gues that this bug has nothing to to with suspend, but
was just triggered by the switch to the console before suspend. I guess
I have to ask the intel-gfx folks.

Regards,
Tino
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