I've found this thread in NVNews.net forums:
http://www.nvnews.net/vbulletin/showthread.php?t=96673
>From the thread:
"Did you already try to set the mysterious PerfLevelSrc option?
/etc/modprobe.d/options:
options nvidia NVreg_RegistryDwords="PerfLevelSrc=0x2222"
It's never been explained by nvidia what it does, but it's evident that it
helps some people (including me) to avoid flickering and XID errors.
It seems to disable adjustment of clock frequencies and helped in my case to
avoid the flickering on a 7900 Go GS (Dell 9400). Of course the GPU gets hotter
without clocking down so use it with care."
>From another user:
"options nvidia NVreg_DeviceFileMode=432 NVreg_DeviceFileUID=0
NVreg_DeviceFileGID=27 NVreg_ModifyDeviceFiles=1 NVreg_SoftEDIDs=0
NVreg_Mobile=1 NVreg_RegistryDwords="PerfLevelSrc=0x2222"
And specifically for Ubuntu users:
"Anyway, so in ubuntu you'd have to add this:
Code:
options nvidia_new NVreg_Mobile=1
NVreg_RegistryDwords="PerfLevelSrc=0x2222"
in /etc/modprobe.d/nvidia-kernel-nkc
Mobile is probably not needed but I like having it to check that the arguments
actually worked.
Finally I can use my card! Thanks to everyone involved."
I'm currently trying this out. Maybe someone is interested, so this is
why I share these comments here.
** Also affects: nvidia-kernel-common (Ubuntu)
Importance: Undecided
Status: New
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Occasional screen-wide "blink" when using compiz
https://bugs.launchpad.net/bugs/164589
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