Subject: Re: [linux-audio-user] Noise related to video.
From: Samuel S Chessman (chessman_AT_tux.org)
Date: Mon Nov 05 2001 - 23:07:44 EET
On Tue, 6 Nov 2001, Patrick Shirkey wrote:
<snip/>
> My video card is a geforce2 mx 32mb agp and I am using xfree86-4.1.0.
> Does anyone have any ideas that I can try to get rid of this noise. I'm
> sure it is a settings problem becuase it wasn't there while using
> mandrake.
>
Perhaps it's the video driver hogging the PCI bus, a known issue
since 1998: See http://www.zefiro.com/vgakills.txt for a reference.
This is not DMA or interrupt conflict but can be configured for some
drivers in XF86Config. Not having a geforce2 I can't be more specific.
I know it's an AGP card but...
The Audio Quality HOWTO says:
Video Cards from Hell
Several years ago the manufacturers of PCI video cards discovered a way
to increase their performance by playing unfairly with the PCI bus. This
can put a lot of awful "zipper" noise into the audio output when you
move windows around the screen.
A Possible Solution: XF86Config
Check your XF86Config file and see if there is a line like this:
Option "pci_retry"
It would be under the "Device" section. Jorn Baayen suggests to try
disabling it (comment it out). Also try enabling the pci_burst option.
Sam
--
Sam Chessman chessman_AT_tux.org
In theory, there is no difference between theory and practice.
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