Hi,
I'm writting a 2D-app with double buffering. I use the env variable
vblank_mode=3
for syncing to vblank and avoiding tearing. The monitor VertRefresh is
set at 60 Hz.
I'm using Xorg 7.1.1 + mesa 6.51 + i810 1.7.2
I have noticed a strange behaviour:
- In a light app where more than 60 FPS are achieved, the app syncs to
vblank (getting 60FPS) and
there is not tearing.
- If I insert some sleep in the applications to get less than 60FPS, it
syncs to 30Hz, 15Hz and so on. Perfect.
- In a heavy app where less than 60 FPS are achieved, setting
vblank_mode=3 doesn't sync with
VertRefresh (ie: getting 37FPS) and tearing appears.
¿Is it normal?
¿Maybe pending interrupts are not being handled properly?
Thanks in advance
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