On Mo, 19.11.07 10:46 susemuse27@xxxxxx 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.
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