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Old 01-06-2007, 07:31 AM   #1
Registered: Nov 2004
Location: KHIE
Distribution: Debian et al
Posts: 81

Rep: Reputation: 16
xorg.conf Device/Screen Options

From man(5) xorg.conf:

Various Option flags may be specified in the Screen section. Some are driver-specific and are described in the driver documentation. Others are driver-independent, and will eventually be described here.
Eventually doesn't help today. The option I am particularly interested in is the backing store. Since I can find no documentation, I can't determine the correct spelling, syntax or even the format of the option statement. I have tried several variations without success.

Is there any documentation anywhere?
If so, where?
If not, is there an initiate willing to risk the wrath of Xorg by sharing the secret incantations?

Last edited by Azizcoos; 01-06-2007 at 07:32 AM.
Old 01-06-2007, 09:49 AM   #2
Gentoo Developer
Registered: Feb 2004
Location: Fort Lauderdale FL.
Distribution: Gentoo
Posts: 3,291
Blog Entries: 5

Rep: Reputation: 58
I think it only works with nvidia or ati;
Option      "backingstore" "true"
When enabled with a Nvidia card, you will find the following lines in your xorg log file /var/log/Xorg.0.log:
File: /var/log/Xorg.0.log

(**) NVIDIA(0): Option "BackingStore" "true"
(**) NVIDIA(0): Backing store enabled"
To see which extensions are loaded;


may need to be root.

Last edited by comprookie2000; 01-06-2007 at 09:53 AM.
Old 01-06-2007, 04:35 PM   #3
Registered: Nov 2004
Location: KHIE
Distribution: Debian et al
Posts: 81

Original Poster
Rep: Reputation: 16
Add one more to the list

Option      "backingstore" "true"
No joy.
name of display:    :0.0
version number:    11.0
vendor string:    The X.Org Foundation
vendor release number:    70101000
X.Org version: 7.1.1
screen #0:
  options:    backing-store NO, save-unders NO

cat /var/log/Xorg.0.log | grep acking
(==) fglrx(0): Backing store disabled
That last bit seems a little odd since I am using the debian driver, not the ati proprietary fglrx driver. Perhaps the backing store option needs to be set in the driver instead of xorg.conf. Now if I only had a clue where the driver config is...

Great sig, BTW.


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