OS: Lubuntu 12.04 64-bit (Ubuntu 12.04 with LXDE)
System: HP DV7-1040ED notebook with Nvidia GPU: NVIDIA Corporation G96 [GeForce 9600M GT] (rev a1)
When working with certain applications windows become unresponsive or take ages to load and when I move my mouse outside of the window the application immediately becomes responsive again. Some examples:
- Thunderbird: opening Thunderbird goes fine but as soon as I click on a folder Thunderbird starts loading which takes way too long. If I just let Thunderbird continue it will eventually become responsive again. If I click on a folder and immediately move my mouse pointer outside the Thunderbird application window Thunderbird immediately loads the folder and remains responsive.
- Qtractor: if I load a project with a lot of plug-ins it takes up to 40 seconds for Qtractor to load the project and become responsive. If I load the same project and move my mouse pointer outside of the Qtractor window that same project loads within 10 seconds.
If necessary I could upload a screencast since this is quite a generic and vague issue. I've tried different window managers but that doesn't make any difference. On the same notebook I also have a Ubuntu 12.04 32-bit with Unity which doesn't show this behavior. My 64-bit Lubuntu machine at work seems to be unaffected also.
Regarding Qtractor loading that specific project, I've run a strace on Qtractor and it seems as if it's looping on loading the different DSSI plug-ins (ZynAddSubFX DSSI in this case). I'm running a non-debug build unfortunately and will install a debug build and post any useful outcome here. This issue only occurs when I start
qtractor /path/to/project from a terminal or from a desktop file. When I start Qtractor as is and then open the project from the menu it loads fine.
I hope someone's got a hunch of what's going on here and if any additional information is needed I'm happy to provide it.