** Description changed:
Ubuntu 8.04.1 on Lenovo T60p
...$ uname -a
Linux luki 2.6.24-19-generic #1 SMP Fri Jul 11 23:41:49 UTC 2008 i686
GNU/Linux
Updated 22 July, 08
...$ lspci | grep VGA
01:00.0 VGA compatible controller: ATI Technologies Inc M56GL [Mobility
FireGL V5200]
- The problem happens with java5 as well as java6.
+ The problem happens with all java implementations: java-1.5.0-sun,
java-6-sun, and java-6-openjdk
The problem happens with fglx as well as with the standard (unaccelerated)
driver
sun-java6-jre:
Installed: 6-06-0ubuntu1
Candidate: 6-06-0ubuntu1
Version table:
*** 6-06-0ubuntu1 0
500 http://gb.archive.ubuntu.com hardy/multiverse Packages
100 /var/lib/dpkg/status
Bug has been present since release of Ubuntu 8.04.
- Graphics/animation in java are often horribly slow. This is not the case on
Ubuntu 7.X, or earlier versions. It also not the case on other distributions.
Attached is an example java program. On distributions with work java, the icon
moves to the location of the mouse smoothly. On Ubuntu 8.04 it moves jerkily
and slowly.
- (to run example java program in the attachment, simply run the shell script
"foo"). The result is that Xorg uses 100% of CPU.
+ Graphics/animation in java are often horribly slow (depends on application,
but is consistent). This is not the case on Ubuntu 7.X, or earlier versions. It
also not the case on other distributions. Attached is an example java program -
on distributions with working java, the icon moves to the location of the mouse
smoothly. On Ubuntu 8.04, on my T60p, it moves jerkily and slowly; I get aprox
1 frame every second, where on working machines it's as much as 60.
+ (to run example java program in the attachment, simply run the shell script
"foo"). Looking at "top" output shows that Xorg uses 100% of CPU.
The has severe problems for use of processing (www.processing.org) as
well as many other java based programs and thus webpages. I suspect
this may be the culprit for several other misunderstood java related
bugs.
- This happens with other versions of Java (openjdk as well as java5), so
- I suspect the bug is in some library that java is talking to, maybe
- xulrunner.
-
- I got this tested on a friends machine, using intel graphics card (Intel
- Mobile GM965/GL960) and the same version of ubuntu and java - it did not
- show the same bug. So it may be something to do with ATI and X.
+ This happens with all versions of Java, so I suspect the bug is in some
+ library that java is talking to, maybe xulrunner. I tested this on a
+ friends machine, using an intel graphics card (Intel Mobile GM965/GL960)
+ and the same version of ubuntu and java - it did not show the same bug.
+ So it may be something to do with ATI and X.
--
Slow graphics/animation in Java, Xorg uses 100% cpu
https://bugs.launchpad.net/bugs/250931
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