19 Nov
2007
19 Nov
'07
6:22 a.m.
On Mo, 19.11.07 10:46 susemuse27(a)gmx.de wrote:
hi,
I should have known this earlier: when starting my 2.6.24.rc2-rt1
with option "acpi=off" the audio performance increases significantly
and I could be happy - but - the levelmeters in Ardour's Mixer are
now acting strangely: They rise quickly but the falloff rate is at
lowest level and can't be adjusted. I've tried with a different
kernel, 2.6.23.1-rt11 - it's the same. Of course I can live with
that, it doesn't prevent me from enjoying my musical activity, but it
takes some patience... With acpi on action Ardour works fine. Did
anybody make similar experience and can give me a hint where to start
my investigations? thanks Susanne
data:
Asus Laptop AMD Athlon 64
ATI-MobilityRadeon9700
openSuse 10.2-32Bit
USB-Lexicon Omega Studio
Ardour built with VST-support
Hi Susanne,
this sounds like a problem with the clocksource.
That could be caused by powernow-k8 and cpufrequency scaling.
I assume when the cpu is powered down right after startup, you see some
messages in dmesg saying:
------
Clocksource tsc unstable (delta = -107437170 ns)
------
If so, you could try to disable cpu frequency scaling
or make sure the system starts and runs with performance governor.
cat /sys/devices/system/clocksource/clocksource0/current_clocksource
shows the currently used clocksource. Please post the output of that
when booting with acpi=off and acpi enabled.