** Summary changed:
- Java cannot change display modes / screen resolution in Gutsy
+ Xinerama prevents Java fullscreen exclusive mode in Gutsy
** Description changed:
- While testing a Java fullscreen mode application in Gutsy I have
- discovered that Java does not find the full list of supported display
- modes it only lists the current screen resolution even though the xrandr
- command lists all supported screen modes. Consequently it cannot use
- full screen exclusive mode in any other resolution than the current one
- in use. This is a regression as the problem does not occur in Feisty.
+ Update: This bug has evolved a little, the summary for this bug now
+ reflects the root cause of the problem, discovered later in the
+ comments. It seems Java fullscreen exclusive mode is not supported when
+ Xinerama is present in Xorg. In Gutsy it seems it is there on all
+ installations (that I've tested) which means no Java fullscreen
+ exclusive mode apps/games will run.
+
+ Original Description: While testing a Java fullscreen mode application
+ in Gutsy I have discovered that Java does not find the full list of
+ supported display modes it only lists the current screen resolution even
+ though the xrandr command lists all supported screen modes. Consequently
+ it cannot use full screen exclusive mode in any other resolution than
+ the current one in use. This is a regression as the problem does not
+ occur in Feisty.
I've tested this on 2 completely different machines first with Feisty
and then with Gutsy.
I've attached a sample Java program DisplayModeLister which outputs a
list of supported screen modes. Here's it's output on Gutsy:
1: 1440 x 900 @ 0Hz -1bit
Here's the xrandr command's output on Gutsy:
Screen 0: minimum 320 x 200, current 1440 x 900, maximum 1440 x 1200
VGA-0 disconnected (normal left inverted right)
LVDS connected 1440x900+0+0 (normal left inverted right) 0mm x 0mm
1440x900 59.9*+
1280x800 60.0
1280x768 60.0
1024x768 60.0
800x600 60.3
640x480 59.9
S-video disconnected (normal left inverted right)
DVI-0 disconnected (normal left inverted right)
Here's DisplayModeLister's output on the same machine running Feisty:
1: 1440 x 900 @ 60Hz -1bit
2: 1024 x 768 @ 60Hz -1bit
3: 800 x 600 @ 60Hz -1bit
4: 640 x 480 @ 60Hz -1bit
5: 640 x 350 @ 60Hz -1bit
6: 640 x 400 @ 60Hz -1bit
7: 720 x 400 @ 60Hz -1bit
8: 1152 x 864 @ 60Hz -1bit
9: 832 x 624 @ 60Hz -1bit
10: 1280 x 768 @ 60Hz -1bit
11: 1280 x 800 @ 60Hz -1bit
12: 1152 x 768 @ 60Hz -1bit
This result is the same in Java 5 and 6. Here are the package versions:
Feisty:
* sun-java6 6-00-2ubuntu2
* xorg 1:7.2-0ubuntu11
* libxrandr 1.2.0-3ubuntu1
* xrandr 1.0.2-0ubuntu1
Gutsy:
* sun-java6 6-03-0ubuntu2
* xorg 1:7.2-5ubuntu13
* libxrandr 2:1.2.1-1
* xrandr 1:1.2.2-0ubuntu1
--
Xinerama prevents Java fullscreen exclusive mode in Gutsy
https://bugs.launchpad.net/bugs/154613
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