xorg weird behavior

[oshunluvr]

On the same computer I have 2006 and 2007 installed. On the 2007/xorg 7.1 install, krandrtray reports a VertRefresh of 50 Hz, but nvidia-settings reports 60 Hz - the setting I used in my xorg.conf.

 

Anyone else notice this discrepancy?

[daniewicz]

I observed this problem with Mandriva 2008 as well. The solution is discussed here:

http://www.linuxquestions.org/questions/sl...9701/page2.html

 

 

To eliminate the vertical refresh rate number discrepancies, add the following to the Screen section in xorg.conf:

Option "DynamicTwinView" "false"

[medo3891]

It's a problem in krandr (IIRC), that makes it report a false refresh rate. The solution would be add Option "DynamicTwinView" "false" to xorg.conf under Section "Device". But honestly I don't bother. Let Krandr report it falsely, doesn't matter really as long as the right refresh rate for the monitor is being used.

 

BTW best way to check the actual refresh rate is to use the buttons on the monitor itself (some monitors do support that feature).

 

daniewicz: it's under Section "Device" not Screen.

[adamw]

The bug is not in krandr. The 'bug' is in the NVIDIA driver itself. For some obscure reason, it abuses X.org's refresh rate reporting mechanisms when twinview mode is enabled; the first attached display shows up with a refresh rate of 50Hz, the second with 51Hz, and so on. It's not krandr's fault, it's just reporting the figure it gets, as it should. It's the NVIDIA driver that reports bogus figures.

 

In 2008 Spring, BTW, we disable twinview mode by default to avoid this issue, as we used to get *tons* of reports of it. As medo says, it's not really a problem: your monitor *is* using the correct refresh rate.

[daniewicz]

Thanks Adam.