so as title says, every few seconds whole desktop is freezing for a second. My investigation has shown that when freeze occur, in htop xfwm4 process turns from S state to D state, seems like it's disk_sleep. So I ran "strace -e trace=open,close,read,write,connect,accept xfwm4 --replace" command, and it turned on that after every freeze there was 2 additional lines in console
close(6) = 0
open("/dev/dri/card0", O_RDWR) = 6
so I guess it's some DRI related problem.
I have Lenovo Z51-70 notebook with CPU Intel Core i5-5200U with Intel HD5500 and AMD Radeon R9 M375. All packages are up-to-date, xfwm4 is in 4.12.4 version, Debian 64bit, kernel 4.9.0-3.
Unlikely a bug in xfwm4.
Try disabling vsync in the compositor settings (xfwm4-tweaks-settings), it's useless anyway.
It looks like vsync was in fact a problem. Thanks. I would never thought about that.
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