Comment 2 for bug 154613

Right. I've been digging into this a little.

As expected the deb source for sun-java6 just includes the *.bin files from Sun, no source code. I tried to find the Java 6 source but the link just goes to the java.net binary downloads page.

Instead I tested again with Icedtea and found it also exhibits the same problem, so I feel fairly happy it's probably using roughly the same code as Java 6. After a little hunting I located the JNI call Java_sun_awt_X11GraphicsDevice_enumDisplayModes(...) in http://icedtea.classpath.org/hg/openjdk/file/ce9dde984c21/j2se/src/solaris/native/sun/awt/awt_GraphicsEnv.c. It's using XRandr calls to get the list of modes. I've coded up a quick C test binary using the same algorithm (attached xrandr-lsmodes.c) and it worked fine on Feisty and Gutsy. Could it be this is a regression in Java 6 u3?

There doesn't seem to be an upstream bug, so I'll raise one.

Output of xrandr-lsmodes.c on 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

Output on Gutsy:

  1: 1440 x 900 @ 60Hz -1bit
  2: 1280 x 800 @ 60Hz -1bit
  3: 1280 x 768 @ 60Hz -1bit
  4: 1024 x 768 @ 60Hz -1bit
  5: 800 x 600 @ 60Hz -1bit
  6: 640 x 480 @ 60Hz -1bit