Compiz incorrectly determines MTS

[Leon Blakey]

Binary package hint: compiz

The Ubuntu version of Compiz is incorrectly determining if the screen size is in the MTS. This is not a bug in the Compiz core, its a bug in the Ubuntu version of compiz.

This was supposidly fixed in 1:0.8.4-0ubuntu15 according to http://changelogs.ubuntu.com/changelogs/pool/main/c/compiz/compiz_0.8.4-0ubuntu15/changelog , but is still not working for me.

Specs:
Card: ATI Radeon X800 XT
Driver: Native OS driver
Reported MTS (with 3D) 2048x2048
Resolution: 2048x768
Compiz Version: 1:0.8.4-0ubuntu15.1 (from lucid-proposed)

And just to prove all of this, here's the console commands I tried

lordquackstar@quackdesk-linux:~$ glxinfo -l | grep -i max_texture_size
    GL_MAX_TEXTURE_SIZE = 2048

lordquackstar@quackdesk-linux:~$ ./compiz-check

Gathering information about your system...

 Distribution: Ubuntu 10.04
 Desktop environment: GNOME
 Graphics chip: ATI Technologies Inc R420 JP [Radeon X800XT]
 Driver in use: radeon
 Rendering method: AIGLX

Checking if it's possible to run Compiz on your system...

 Checking for texture_from_pixmap... [ OK ]
 Checking for non power of two support... [ OK ]
 Checking for composite extension... [ OK ]
 Checking for FBConfig... [ OK ]
 Checking for hardware/setup problems... [ OK ]

lordquackstar@quackdesk-linux:~$ compiz --replace
WARNING: Application calling GLX 1.3 function "glXCreatePixmap" when GLX 1.3 is not supported! This is an application bug!
compiz (core) - Warn: Exceeded max texture size

Launching fallback window manager

[Travis Watkins (amaranth)]

Actually 1:0.8.4-0ubuntu15 is what is causing this problem for you, it isn't a fix for this problem. It's a fix for the opposite problem: bug 428769

Since the choice is between you having a working system with compiz and the other bug reporter having a broken system this bug is Won't Fix.

[Leon Blakey (thelq)]

@Travis: I'm confused, I'm not using 15, I'm using 15.*1*, which is the most recent version available in lucid-proposed.

And I do have a working system. The MTS for my card is 2048x2048, and I am at 2048x768, just at the limit. And according to some developers at the Compiz IRC channel, this is a bug in the ubuntu wrapping of compiz, not compiz itself.

If this isn't a bug then I am doing something wrong, so what is it?

[Travis Watkins (amaranth)]

You're not doing anything wrong and it isn't a bug in our wrapper. It is a deliberate decision to block compiz from running in such a situation due to bug 428769

[Leon Blakey (thelq)]

Then why does the changelog say that they changed the greater than to greater than *or equal to*. Mine is equal, and I should be seeing the results of the change.

    - improve the maxTextureSize check to test for >= instead of
      just > (thanks to bryceh) LP: #428769

However as noted in comment #22 of that bug, this is an ATI card, not an integrated intel chip. If I can figure out where in the source the change occurred, I'll test it myself and see if I experience the blank screen.

[Travis Watkins (amaranth)]

Right, it used to check to see if you had a resolution higher than 2048 and fall back to metacity if that was the case. Now it checks if you have a resolution higher than or equal to 2048 and falls back to metacity. The fix in bug 428769 wasn't a fix for your issue, it was the cause of your issue.