Comment # 9
on bug 84663
from Christoph Haag
I wish I had an idea what causes this. I think this is a general problem, but I can't put my finger on it. Yesterday at home I tried the oculus rift unity3d demo with -force-opengl in wine and got pretty much 75fps everywhere. Today at uni it drops to 45 fps when looking at the more complex objects in the demo. Then CPU usage is at ~113% and the GPU usage is relatively low. Something from disconnecting audio jacks, dvi monitor, usb hub with keyboard, mouse and usb DAC, suspending, waking up on battery, suspending again, waking up on power must have caused the state where it's performing badly. Trying with dri2 instead of dri3, setting vblank_mode=0, switching to another window manager, restarting X, connecting another dvi monitor, setting the display to another crtc, nothing seems to have any effect. I think at one point I disabled intel pstate cpu scaling and this didn't help either... The state where it's performing well happens rarely, but it seems that it randomly does happen. The next time I'll make sure to test borderlands 2 too to confirm whether there is some underlying problem and collect some profiling data...
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