[ubuntu] Lenovo T400 Suspend / Hibernate / Resume Problems

[mulatu]

I can confirm the above entries. Lenovo T400 under Ubuntu 8.10 Intrepid hibernates, but doesn't wake up under Gnome. Waking up to a console works.

[petri0]

Hi!

This problem affects not just the Lenovo T400 but also for example the new Dell Latitude E4200, HP EliteBook 2530p, Sony Vaio VGN-TT1, Toshiba R600, or anything else with the "Mobile Intel® GM45 Express Chipset" or X4500. I have exactly the same symptoms on my E4200 running intrepid.

The bug most certainly resides in the xserver-xorg-video-intel code. The fact that is manifests itself only with gnome desktop and not with KDE or text mode gives some clue. It is not compiz related as disabling compiz has no effect. I would say that this is a classical multiprocessor concurrency control problem! Disabling all but one core makes the bug disappear.

Here is my suggestion for a workaround. Save in /etc/pm/sleep.d/00CPU with 755 permissions. Note that it has to be called 00CPU so that it gets executed before and after anything else.

#!/bin/sh
# Workaround for concurrency bug in xserver-xorg-video-intel 2:2.4.1-1ubuntu10.
# Save this as /etc/pm/sleep.d/00CPU

. "${PM_FUNCTIONS}"

case "$1" in
	hibernate|suspend)
		for i in /sys/devices/system/cpu/cpu*/online ; do
			echo 0 >$i
		done
		;;
	thaw|resume) 
		sleep 10	# run with one core for 10 secs
		for i in /sys/devices/system/cpu/cpu*/online ; do
			echo 1 >$i
		done
		;;
	*)
		;;
esac

Please report if this works for you! The sleep period can easily be made longer if necessary.

Petri K

[jango4]

Hi!

Thank you for your workaround script.... tested it as you told, but unfortunately it does not work for me. Same problem, screen freezes!
Should i change sleeping period?

jango

[jango4]

Changed sleeping period to 20 seconds, but without any effect.
I want Suspend working without troubles!

[petri0]

You could try that. I tried first with 5 seconds but that wasn't enough.
Or just as a test you could forget the script and try running with just one core temporarily. Of course it's possible that the T400 problem is something else, this works for Dell E4200.

Petri K

[jango4]

-

[jango4]

You really got it! It works perfectly with only one CPU enabled in BIOS settings.

but why is your script not working for me?
typed: sudo gedit
pasted your code, saved in /etc/pm/sleep.d/00CPU
typed sudo chown 755 /etc/pm/sleep.d/00CPU
should work, or?

jango

[jango4]

I am such a noob... chmod... not chown!
It works perfekt!
Thanks a lot for your help!

lg Jango

[eeejay]

I got resume/suspend working by simply disabling Bluetooth in BIOS...

[afty]

Originally Posted by eeejay I got resume/suspend working by simply disabling Bluetooth in BIOS...

My T400 doesn't have Bluetooth, but I do have the suspend problem. It goes into suspend fine, but when you try to bring it out, the machine sits there for a minute and then reboots.

I found this suggestion over at Notebook Review:

Good news, i think i've just solved suspend/hibernation problem. I cant paste url here, but on lkml Jassie Barnes wrote about similar issue: "On many machines, we've found that re-POSTing the video device is incompatible with the i915 driver's suspend/resume functionality. So things like s3_bios and vbetool shouldn't be used if the i915 driver works by itself." After deleting vbetool i have absolutely no problems with suspend and hibernation .

I haven't tried it yet, but maybe someone here could try and report back?