Or perhaps a conflict with the nvidia driver:

NVidia and XRandR 1.2

After I bumped into that thread, I ran a quick test. I exited X and changed the xorg.conf from nvidia to nv (I keep copies of both configuration files for easy changes). I started X, checked the KDE control center and I saw 75 Hz. I ran xrandr and I saw 75 Hz. Perhaps then xrandr is not the culprit. Seems the nvidia driver is somehow confusing xrandr.

So in a way, problem partially solved.

Edit: Problem Fully Solved (At Least For Me)

Sometimes persistent pays. Sometimes.

I ran across an nvidia forum thread, which led me to this page (read the very last item at the bottom).

The solution for me, to eliminate the vertical refresh rate number discrepancies, was to add the following to the Screen section in my xorg.conf:

Option "DynamicTwinView" "false"

Now there is no discrepancy when using the 169.09 nvidia driver. Every tool reports 75 Hz, including xrandr, which now reports both frequencies that the monitor supports (60 and 75 Hz). KDE now even offers me the option to use 60 Hz.

I hope this information helps others.

Good sleuthing, Woodsman. "And that's the end of that chapter."

That was indeed a great piece of investigative work there, woodsman. Good job!

Works. This certainly should be put into FAQ somewhere.

Everybody who participated in this thread deserves the kudos. I merely rearranged the pieces of the puzzle based upon the discussion. But thanks.

One caution, I have no idea how this solution affects people who use multiple monitors.

Just confirming that /Option "DynamicTwinView" "false"/ fixed the xrandr output for me as well. Good job tracking that one down Woodsman.

The DynamicTwinView false also works for me, I have a two-screen setup that uses an emachine monitor (eview 17f3) and a Vizio HDTV and never had the correct refresh rates displayed for either, I believe 50Hz was shown for both screens. Adding that option shows the correct refresh rates for both screens now, with the CRT running at 1280x1024@60Hz and the HDTV running at 1024x768@75Hz.

The only thing I notice right away is that you can't use the twinview setup through nvidia-settings like you could before, which only makes sense since it's disabled now. Not a big deal to me since the screens are already set up how I want them.

I'd also like to mention that you can also check to see what refresh rate your monitor is running at by checking the on screen display if there is one. Even though KDE was showing 50Hz as my only option for vertical refresh, pushing the button to bring up the OSD for my monitor always showed 59.9Hz when I was running at 1280x1024. Another way to check vertical refresh, if you are using an nvidia card and the proprietary drivers at least, is to run nvidia-settings and under the opengl settings for your monitor check the Sync to VBlank box. Then run glxgears and the output should give you an idea. Doing this on my box gives something like:

303 frames in 5.0 seconds = 60.450 FPS
301 frames in 5.0 seconds = 60.023 FPS
301 frames in 5.0 seconds = 60.030 FPS

Which fits pretty well with what I already know it's running at.

Thanks for the fix

hey guys check out this post, it fixed my problem http://www.nvnews.net/vbulletin/show...52#post1421852

Nevermind, I guess I should of read the full post, lol

And give it a good rating! (button on top-right of first post)

To anybody interested, the problem solution posted in this thread is still required with the 180.29 drivers. I was testing a similar xrandr problem with the generic nv driver and I thought I'd check the proprietary side again. No change: without the xorg.conf options xrandr gets confused.

IF your using the nvidia driver then add this option to your xorg.conf
under the "Device" section

Option "DynamicTwinView" "false"

This will fix the 50Hz refresh problem. For more details see this post
http://www.nvnews.net/vbulletin/show...52#post1421852

Nevermind I got a head of myself, this was answered in the first post, lol