high system load, mouse clicks unresponsive after resume from suspend

[James]

For the last week or so, Kubuntu desktop has been unresponsive after coming back from suspend.

Symptoms:
* keyboard works ok
* desktop does not respond to mouse clicks (menu button, right click anything, anything in the panel)
* applications can be started normally using keyboard
* the only mouse action that works is dragging the KDE Twitter plasmoid around the desktop (maybe other plasmoids ?)
* extremely high system load immediately after coming back from suspend
* when I check top a load of 18 or so is seen, rapidly decreasing... no apps consuming massive system resources so it might be a minor thing that triggers load then stops.

Workaround
* Ctrl-Alt-backspace to restart X and log in again. system is then fully responsive.

I've attached a load chart over the last 3 days (the second load spike above Wed 12 is not related to this issue).

Packages installed over the last 10 days:
2009-03-17 09:43:08 status installed man-db 2.5.2-2
2009-03-17 09:43:09 status installed libavutil49 3:0.svn20080206-12ubuntu3.1
2009-03-17 09:43:09 status installed libavformat52 3:0.svn20080206-12ubuntu3.1
2009-03-17 09:43:09 status installed libavdevice52 3:0.svn20080206-12ubuntu3.1
2009-03-17 09:43:09 status installed libswscale0 3:0.svn20080206-12ubuntu3.1
2009-03-17 09:43:09 status installed ffmpeg 3:0.svn20080206-12ubuntu3.1
2009-03-17 09:43:09 status installed libglib2.0-0 2.18.2-0ubuntu2.1
2009-03-17 09:43:09 status installed libglib2.0-dev 2.18.2-0ubuntu2.1
2009-03-17 09:43:09 status installed libgstreamer-plugins-base0.10-0 0.10.21-3ubuntu0.1
2009-03-17 09:43:09 status installed libpostproc51 3:0.svn20080206-12ubuntu3.1
2009-03-17 09:43:09 status installed linux-libc-dev 2.6.27-14.30
2009-03-17 09:43:09 status installed libc6 2.8~20080505-0ubuntu9
2009-03-17 14:10:09 status installed man-db 2.5.2-2
2009-03-17 14:10:10 status installed kdebase-workspace-libs4+5 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed kdebase-workspace-dbg 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed libkdecorations4 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed libkwineffects1 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed kde-window-manager 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed kdebase-workspace-data 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed kdebase-workspace-bin 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed kdm 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed klipper 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed ksysguard 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed ksysguardd 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed kwin 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed systemsettings 4:4.2.1a-0ubuntu1~intrepid3
2009-03-17 14:10:10 status installed libc6 2.8~20080505-0ubuntu9
2009-03-19 00:30:03 status installed libnss3-1d 3.12.0.3-0ubuntu5.8.10.1
2009-03-19 00:30:04 status installed libc6 2.8~20080505-0ubuntu9
2009-03-19 23:26:34 status installed man-db 2.5.2-2
2009-03-19 23:26:35 status installed doc-base 0.8.16
2009-03-19 23:26:37 status installed bzr 1.13-2~bazaar1~intrepid1
2009-03-20 16:13:05 status installed libjasper1 1.900.1-5ubuntu0.1
2009-03-20 16:13:05 status installed libjasper-dev 1.900.1-5ubuntu0.1
2009-03-20 16:13:05 status installed libc6 2.8~20080505-0ubuntu9
2009-03-24 20:08:26 status installed man-db 2.5.2-2
2009-03-24 20:08:27 status installed libgs8 8.63.dfsg.1-0ubuntu6.3
2009-03-24 20:08:28 status installed ghostscript 8.63.dfsg.1-0ubuntu6.3
2009-03-24 20:08:28 status installed ghostscript-x 8.63.dfsg.1-0ubuntu6.3
2009-03-24 20:08:28 status installed liblcms1 1.16-10ubuntu0.2
2009-03-24 20:08:28 status installed liblcms1-dev 1.16-10ubuntu0.2
2009-03-24 20:08:29 status installed libc6 2.8~20080505-0ubuntu9

I wonder if it's related to the recent kde-base-workspace update ?

[James (james-ellis-gmail)]

This occurred again this morning, resuming from suspend. load avg of 10, rapidly decreasing. Left click on the mouse didn't work, keyboard works, right click on the mouse works. Happens with 2 different USB mice and the notebook trackpad.
Only workaround is to restart X (Ctrl - Alt - Backspace)

[James (james-ellis-gmail)]

This is occurring with kde 4.2.2

If I disconnect the USB mouse then the trackpad works correctly. Reconnecting the USB mouse again causes the trackpad and USB mouse to do what's described in this bug report.

This has been evident since 4.2.1 was installed. The only way to have a function desktop with a USB mouse is to restart X, which kind of makes system suspend in Kubuntu useless.

[Rich Johnson (nixternal)]

On Karmic, running KDE 4.3.1, I just attempted this a few times on 3 different machines (1 desktop, 1 laptop, 1 netbook) all running the latest Karmic and I was unable to reproduce this. In the past suspend never worked for me, so I was happy to try this out and I am happy I can suspend again :)

Are you still experiencing this issue? What is your system specs? I use all Intel here and I am not having any issues at this time. Thanks!

[James (james-ellis-gmail)]

No, it seems fixed (KDE 4.3.2)

[Jonathan Thomas (echidnaman)]

Glad to hear it. :)