Display freezes when dragging windows while GL program is active

[Alistair Buxton]

To reproduce:

1. Start glxgears or similar.
2. Attempt to drag a window.

At best, the window will lag behind the mouse pointer by 2-3 seconds. At worst it can freeze the display totally until you stop dragging the window.

The odd thing about this is that glxgears claims to be running at 60FPS the whole time, even when the screen does not update for several seconds.

Also, the size of the glxgears window does not matter. Even a tiny GL window locks compiz completely.

This is almost certainly a problem related to nvidia binary driver. I'm using 310.

Video of bug happening: https://www.youtube.com/watch?v=wioiW72BiqE

This is probably a regression of #764330. Opening a new bug as requested on that bug report.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: compiz 1:0.9.8.4+bzr3407-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Wed Nov 28 22:54:32 2012
MarkForUpload: True
PackageArchitecture: all
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)

[Alistair Buxton (a-j-buxton)]

I ssh'd into the machine to check top, and this is what I see while reproducing. Note I have a quad core, so 50% CPU = two cores maxed.

[Alistair Buxton (a-j-buxton)]

I've just tested this with ppa:unity-team/sru and the bug is present there too.

[Daniel van Vugt (vanvugt)]

Indeed this is one of the test cases I started using yesterday for bug 1049214. It is bug 1049214.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.