Hundreds of simultanious screensaver/kdesktop_lock processes while game open

Binary package hint: kdesktop

Started up quake4 game (full screen opengl, latest nvidia driver, kubuntu 6.06, kernel-i686 on amd64)

Then instead of playing it, I went to do something more useful, and didn't use the mouse/keyboard for about 15 minutes. Result:
Hundreds of screensaver(kclock.kss) and kdesktop_lock processes using lots of resources, while no screen saver visible. See ps output below. The screensaver is set to start after 5 minutes (automatically, without password).

After I returned, the system was quite unresposive, so that it took quite some effort to close the game. The kdesktop_lock and screensaver processes had to be manually killed off afterwards.

This is reproducable with quake4, I didn't test this with other applications or other screensavers so far.

ps output after finally managing to exit the game as follows:

user 17981 9.5 1.0 37968 10392 ? S 20:41 2:40 /usr/bin/kdesktop_lock
user 17982 0.3 1.1 27100 12232 ? RN 20:41 0:05 \_ /usr/bin/kclock.kss -root
user 18061 3.5 1.0 53276 10936 ? S 20:46 0:48 /usr/bin/kdesktop_lock
user 18062 0.2 1.1 27100 12228 ? RN 20:46 0:03 \_ /usr/bin/kclock.kss -root
user 18151 1.9 1.0 53276 10432 ? S 20:51 0:21 /usr/bin/kdesktop_lock
user 18152 0.2 1.1 27096 12224 ? RN 20:51 0:02 \_ /usr/bin/kclock.kss -root
user 18230 1.1 1.0 50772 10704 ? S 20:56 0:09 /usr/bin/kdesktop_lock
user 18232 0.2 1.1 26964 12212 ? RN 20:56 0:01 \_ /usr/bin/kclock.kss -root
user 18235 1.0 1.0 51428 10612 ? S 20:56 0:07 /usr/bin/kdesktop_lock
user 18236 0.1 1.1 27100 12000 ? RN 20:56 0:01 \_ /usr/bin/kclock.kss -root
user 18239 1.0 0.9 50900 10340 ? S 20:56 0:08 /usr/bin/kdesktop_lock
user 18242 0.1 1.1 27100 12224 ? SN 20:56 0:01 \_ /usr/bin/kclock.kss -root
user 18244 1.1 1.0 47868 10368 ? S 20:56 0:08 /usr/bin/kdesktop_lock
user 18245 0.1 1.1 26640 11756 ? RN 20:56 0:01 \_ /usr/bin/kclock.kss -root
user 18249 1.1 1.0 51164 10416 ? S 20:56 0:08 /usr/bin/kdesktop_lock
user 18252 0.2 1.1 26636 11764 ? RN 20:56 0:01 \_ /usr/bin/kclock.kss -root
user 18254 1.0 1.0 51696 10504 ? S 20:56 0:07 /usr/bin/kdesktop_lock
user 18258 0.2 1.1 26636 11760 ? RN 20:56 0:01 \_ /usr/bin/kclock.kss -root
user 18261 0.9 0.9 42188 10320 ? S 20:56 0:06 /usr/bin/kdesktop_lock
user 18265 0.2 1.1 26640 11776 ? RN 20:57 0:01 \_ /usr/bin/kclock.kss -root
user 18269 1.1 1.0 37968 10684 ? S 20:57 0:07 /usr/bin/kdesktop_lock
user 18277 0.2 1.1 26636 11760 ? RN 20:57 0:01 \_ /usr/bin/kclock.kss -root
user 18279 0.8 1.0 38100 10592 ? S 20:57 0:05 /usr/bin/kdesktop_lock
user 18281 0.2 1.1 27100 12220 ? SN 20:57 0:01 \_ /usr/bin/kclock.kss -root
user 18284 0.8 1.0 37968 10572 ? S 20:57 0:05 /usr/bin/kdesktop_lock
user 18285 0.1 1.1 26636 11756 ? RN 20:57 0:01 \_ /usr/bin/kclock.kss -root
user 18288 1.0 1.0 37968 10484 ? S 20:57 0:06 /usr/bin/kdesktop_lock
user 18289 0.2 1.1 26640 11756 ? RN 20:57 0:01 \_ /usr/bin/kclock.kss -root
user 18292 1.0 1.0 37572 10448 ? S 20:58 0:07 /usr/bin/kdesktop_lock
user 18293 0.2 1.1 27100 12224 ? SN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18296 1.1 1.0 37568 10420 ? S 20:58 0:07 /usr/bin/kdesktop_lock
user 18297 0.2 1.1 26640 11772 ? RN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18301 1.0 1.0 37568 10688 ? S 20:58 0:07 /usr/bin/kdesktop_lock
user 18302 0.2 1.1 27096 12176 ? TN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18305 0.9 1.0 37700 10524 ? S 20:58 0:05 /usr/bin/kdesktop_lock
user 18306 0.1 1.1 26640 11772 ? RN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18309 0.9 1.0 38100 10540 ? S 20:58 0:06 /usr/bin/kdesktop_lock
user 18310 0.2 1.1 27096 12228 ? SN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18313 1.1 1.0 37308 10572 ? S 20:58 0:07 /usr/bin/kdesktop_lock
user 18315 0.2 1.1 26636 11764 ? RN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18318 0.7 1.0 37568 10824 ? S 20:58 0:04 /usr/bin/kdesktop_lock
user 18319 0.2 1.2 27100 12512 ? SN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18322 0.9 1.0 37568 10424 ? S 20:58 0:06 /usr/bin/kdesktop_lock
user 18323 0.2 1.1 26640 11756 ? RN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18326 0.9 0.9 38100 10320 ? S 20:58 0:05 /usr/bin/kdesktop_lock
user 18327 0.2 1.1 26640 12076 ? RN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18330 0.8 1.0 37304 10436 ? S 20:58 0:05 /usr/bin/kdesktop_lock
user 18331 0.1 1.1 27100 12224 ? SN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18335 0.8 1.0 37308 10592 ? S 20:58 0:05 /usr/bin/kdesktop_lock
user 18336 0.1 1.1 26640 12132 ? RN 20:58 0:01 \_ /usr/bin/kclock.kss -root
user 18339 0.8 1.0 37308 10604 ? S 20:58 0:05 /usr/bin/kdesktop_lock
user 18340 0.1 1.1 26640 12172 ? RN 20:59 0:01 \_ /usr/bin/kclock.kss -root
user 18343 0.9 0.9 37704 10188 ? S 20:59 0:05 /usr/bin/kdesktop_lock
user 18344 0.2 1.1 26636 12256 ? RN 20:59 0:01 \_ /usr/bin/kclock.kss -root
user 18347 0.8 1.0 37308 10736 ? S 20:59 0:05 /usr/bin/kdesktop_lock
user 18349 0.1 1.1 27096 12376 ? RN 20:59 0:01 \_ /usr/bin/kclock.kss -root
user 18352 0.6 1.0 37436 10672 ? S 20:59 0:03

[rest snipped. it just goes on like this for another 6 minutes]