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Old 10-18-09, 05:56 AM   #1
marcel83
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Default BUG: Temporary freezes with compositing enabled with 190.xx drivers

Hi

I've been testing the 190.36 and 190.40 drivers lately. They work fine as long as no compositing is used, OpenGL apps work great, too, but as soon as I enable compositing (either KWin or Compiz) the display keeps locking up all the time, that is, it freezes for some time (1-10 seconds) then works for a few seconds before it freezes again. I don't have this problem with the 185.18.31 drivers.
Any idea what could cause this?

Thanks in advance.
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Old 10-18-09, 01:51 PM   #2
conky
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Default Re: BUG: Temporary freezes with compositing enabled with 190.xx drivers

Option "UseEvents" "true"

This is your problem. UseEvents is broken with the 190 drivers. Set this to false in your xorg.conf.
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Old 10-19-09, 06:38 AM   #3
marcel83
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Default Re: BUG: Temporary freezes with compositing enabled with 190.xx drivers

Thanks, that solved the problem for now (well, actually it really just hides the actual problem but I can live with that).
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Old 10-19-09, 10:36 AM   #4
Milena
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Default Re: BUG: Temporary freezes with compositing enabled with 190.xx drivers

i got the same problem with kwin + compositing effects and any opengl related applications, especially wine games, x freezes occasionally for 1-5 seconds. thanks for the info about the "UseEvents" option, i was reading the readme and it says:

Enables the use of system events in some cases when the X driver is waiting for the hardware. The X driver can briefly spin through a tight loop when waiting for the hardware. With this option the X driver instead sets an event handler and waits for the hardware through the poll() system call.

does it cause any disadvantages i should be aware of ?

thanks in advance and best regards
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Old 10-22-09, 09:24 AM   #5
marcel83
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Default Re: BUG: Temporary freezes with compositing enabled with 190.xx drivers

You might notice a slightly higher CPU load in some situations due to the busy waiting. Other than that there probably shouldn't be any disadvantages.
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