Bug 136212

Summary:	nVidia beta driver 1.0-9625 - kde display shows wrong refresh rate
Product:	krandr	Reporter:	Nick Warne <nick>
Component:	control center	Assignee:	Gustavo Pichorim Boiko <gustavo.boiko>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	danielstefanmader+kde, finex, myriam, wstephenson
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Compiled Sources
OS:	Linux
Latest Commit:		Version Fixed In:
Attachments:	nVidia bug report KDE display

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.