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-   -   Incorrect frequencies returned by xrandr (http://www.nvnews.net/vbulletin/showthread.php?t=100869)

torturedutopian 10-23-07 01:30 PM

Incorrect frequencies returned by xrandr
Hi everyone !

Here's an issue I've been experiencing for about one year, with different linux versions, and two different gfx boards : 6600 and 8600 GTS.

I generated my xorg.conf with nvidia-settings. So the right frequencies are supposed to be obtained through EDID. (this is a LG L1915S LCD screen)

Indeed, in nvidia-settings, I see 60 Hz and 75 Hz as available frequencies. My monitor OSD confirms those frequencies.

However, other pieces of software seem to be confused.

Example, when I type "xrandr" I get the following frequencies :

1280x1024      50.0    51.0
I see those very same frequencies in the Gnome resolution selector as well.

I figured out that when choosing 50 Hz, it actually set 60 Hz, and when choosing 51 Hz, the actual frequency was 75 Hz.

See : http://mahen.free.fr/images/frequencies.jpg

Why am I complaining ? ;) Actually because I'm afraid it may have some other unexpected consequences. Example : in compiz, the option to detect the refresh frequency automatically give me a little choppy experience.

What do you people think about this ? :)
Thanks a lot for reading & best regards !

netllama 10-23-07 01:32 PM

Re: Incorrect frequencies returned by xrandr
This is expected behavior. See the driver README's discussion of DynamicTwinview.

torturedutopian 10-23-07 01:36 PM

Re: Incorrect frequencies returned by xrandr
Thanks for the incredibly fast reply, I guess I didn't spend enough time investigating, sorry :-/


torturedutopian 10-23-07 02:07 PM

Re: Incorrect frequencies returned by xrandr
Appending the "Option "DynamicTwinView" "false"" to my xorg / device section, I now get a muuuch smoother experience.

Example, in the game "Ankh", which was a little choppy before (w/ compiz enabled, at least). And it seems also better with Compiz, this time I get keep the "detect framerate" ticked.

Hurray, thanks a lot :)

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