8 Apr
2007
8 Apr
'07
9:38 a.m.
Andrew Burgess <aab(a)cichlid.com>om>:
Paul Davis wrote:
>> What could cause clicks without xruns? I'm baffled.
>PCI bus hogging, for one thing. consider running a script like this
...
Here one that works automatically for all multimedia
devices:
# find multimedia devices
pcis=$(lspci -v | grep Multimedia | awk '{ print $1; }')
if test -z "$pcis"; then
echo WARNING: no multimedia devices found on pci bus
else
for p in $pcis; do
echo set maximum latency timer for $p
setpci -s $p latency_timer=ff
done
fi
It does not work for me:
$ lspci | grep Multi | head -1 | cut -b-75
0000:00:05.0 Multimedia audio controller: nVidia Corporation nForce MultiMe
$ setpci -s 0000:00:05.0 latency_timer
lspci: -s: Invalid slot number
$ setpci -s 00:05.0 latency_timer
00
I have to remove the first 0000: from lspci, as in:
$ cat /usr/local/sbin/pci.set.audio
#!/bin/sh
val=${1:-ff}
# find multimedia devices
pcis=$( lspci -n | grep ' 0401: ' | cut -f1 -d\ | cut -f2- -d: )
if test -z "$pcis"; then
echo WARNING: no multimedia devices found on pci bus
else
for p in $pcis; do
lspci -s $p
echo -en \\tmaximum latency timer:\
setpci -s $p latency_timer | tr -s ' \n' ' '
setpci -s $p latency_timer=$val > /dev/null
echo -n '-> '
setpci -s $p latency_timer
done
fi
$
Though all devices does not change:
# pci.set.audio | cut -b-68
0000:00:05.0 Multimedia audio controller: nVidia Corporation nForce
maximum latency timer: 00 -> 00
0000:00:06.0 Multimedia audio controller: nVidia Corporation nForce2
maximum latency timer: 00 -> 00
0000:01:09.0 Multimedia audio controller: VIA Technologies Inc. ICE1
maximum latency timer: 00 -> f8
#
Regards,
/Karl
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Karl Hammar Aspö Data karl(a)aspodata.se
Lilla Aspö 2340 Networks
S-742 94 Östhammar +46 173 140 57 Computers
Sweden +46 70 511 97 84 Consulting
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