Bug 136212 - nVidia beta driver 1.0-9625 - kde display shows wrong refresh rate
Summary: nVidia beta driver 1.0-9625 - kde display shows wrong refresh rate
Status: RESOLVED UPSTREAM
Alias: None
Product: krandr
Classification: Miscellaneous
Component: control center (show other bugs)
Version: unspecified
Platform: Compiled Sources Linux
: NOR normal
Target Milestone: ---
Assignee: Gustavo Pichorim Boiko
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2006-10-23 23:27 UTC by Nick Warne
Modified: 2012-06-20 07:52 UTC (History)
4 users (show)

See Also:
Latest Commit:
Version Fixed In:

Attachments
nVidia bug report (75.92 KB, text/plain)
2006-10-23 23:29 UTC, Nick Warne 		Details
KDE display (35.19 KB, image/png)
2006-10-23 23:31 UTC, Nick Warne 		Details
View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description Nick Warne 2006-10-23 23:27:25 UTC 
Version:            (using KDE KDE 3.5.5)
Installed from:    Compiled From Sources
Compiler:          GCC 3.4.6 -march=athlon-tbird
OS:                Linux

Tonight I installed latest nVidia beta driver 1.0-9625.  All indications show my TFT to be running at 60Hz.

kcmshell [kdeinit] display shows it is running at 50Hz.

Nick
Comment 1 Nick Warne 2006-10-23 23:29:07 UTC 
Created attachment 18239 [details]
nVidia bug report

nVidia bug report that details X configuration.
Comment 2 Nick Warne 2006-10-23 23:31:32 UTC 
Created attachment 18240 [details]
KDE display

What KDE display now shows
Comment 3 Nick Warne 2006-10-24 00:24:32 UTC 
I got a reply from nVidia poeple:

"Why is the refresh rate not reported correctly by utilities that use the XRandR X extension (e.g., the GNOME "Screen Resolution Preferences" panel, `xrandr -q`, etc)?
  The XRandR X extension is not presently aware of multiple display devices on a single X screen; it only sees the MetaMode bounding box, which may contain one or more actual modes. This means that if multiple MetaModes have the same bounding box, XRandR will not be able to distinguish between them.
In order to support DynamicTwinView, the NVIDIA X driver must make each MetaMode appear to be unique to XRandR. Presently, the NVIDIA X driver accomplishes this by using the refresh rate as a unique identifier.
You can use `nvidia-settings -q RefreshRate` to query the actual refresh rate on each display device.
This behavior can be disabled by setting the X configuration option "DynamicTwinView" to FALSE."

Ref:

http://download.nvidia.com/XFree86/Linux-x86/1.0-9625/README/chapter-04.html (last paragraph)

Nick
Comment 4 Davide Perini 2006-10-27 20:50:48 UTC 
I've got same problem on FC6 using same driver.
I can disable this behavior with "DynamicTwinView" to False as told by Nick.

Please correct this problem.
Thanks!
Comment 5 Lubos Lunak 2009-11-10 17:47:16 UTC 
There is nothing to fix in KDE, see comment #3.