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Old 02-24-11, 07:53 AM   #1
johncom
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Default How to disable dithering on NV Qaudro FX

Conf.:
X.Org server 1.6.5
SLED 11 SP 1 ker. 2.6.32.12
NVdriver 260.19.36

Problem:
very bad performance out of "PCoIP - KVM extension" when using NV Qaudro FX 380/580 cards. The cards are OK when connected directly without PCoIP part.

The problem seems to be related to dithering - frequent unnecessary screen updates.
How can I permanently disable dithering?
How to check the state of dithering?
I have tried following with no success:
1.
nvidia-setting utility:
GPU-0 - DFP-0 - Dithering Controls - Dithering Auto (switch to disabled)
it keeps on being auto - How to save disabled option?
2.
configuration of xorg.conf
Section “Screen”
Identifier ...
Device ...

Option "Dac8Bit" "False"
Option "RegistryDwords" "DitherAlgo8=3; DitherAlgo6=3"
It does not work for me.

regards V.
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Old 02-24-11, 09:20 AM   #2
AaronP
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Default Re: How to disable dithering on NV Qaudro FX

Try

Option "FlatPanelProperties" "Dithering=Disabled"

or

Option "FlatPanelProperties" "DitheringMode=Static-2x2"
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Old 02-24-11, 07:41 PM   #3
danix
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Default Re: How to disable dithering on NV Qaudro FX

The nvidia-settings control panel in recent 270 releases also has an option to disable this (in the settings panel for each display).

[edit: sorry; the 260 control panel has this too, as noted by johncom, but the setting isn't persistent unless added to the X config.]
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Old 02-25-11, 09:02 AM   #4
johncom
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Default Re: How to disable dithering on NV Qaudro FX

Both Options do the job. Thank you for prompt answer.
Reagards V.
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