As I wanted to check again I noticed that the problem disappeared on my Amilo Xi 2428. Since my earlier post I did an upgrade from Ubuntu 8.10 to 9.04, so now:
Linux 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 GNU/Linux,
maybe that solved the problem.
As I wanted to check again I noticed that the problem disappeared on my Amilo Xi 2428. Since my earlier post I did an upgrade from Ubuntu 8.10 to 9.04, so now:
Linux 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009 i686 GNU/Linux,
maybe that solved the problem.