[LAU] Ardour 2.1 Mixer Levelmeters acting very slow with acpi=off

[Susanne Schneider]

Thomas,
I do not get anything like:

"Clocksource tsc unstable (delta = -107437170 ns)"
in dmesg...

when booting with "acpi=off",
cat /sys/devises/..../current_clocksource  returns: "tsc"

when booting in regular mode (acpi enabled),
cat /sys/devises/..../current_clocksource  returns: "acpi_pm"

thanks and best regards
Susanne 


Thomas Kuther schrieb:
> On Mo, 19.11.07 10:46 susemuse27 at 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.
>
>
>   
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