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Re: 4.0/i386 auich_calibrate() and GENERIC.NOACPI failure (microtime?)
In article <20080111155333.GA979%ece.cmu.edu@localhost>,
Chuck Cranor <chuck%ece.cmu.edu@localhost> wrote:
> I updated my i386/desktop to 4.0 yesterday, and discovered that the
>audio auich0 does not configure properly with the GENERIC.NOACPI kernel.
>It might be timecounter related?
>GENERIC kernel (correct audio):
> auich0: measured ac97 link rate at 55069 Hz, will use 55000 Hz
>GENERIC.NOACPI (audio plays at wrong rate):
> auich0: measured ac97 link rate at 43170 Hz, will use 48000 Hz
>55000 Hz is the correct value, 48000 Hz sounds wrong (music too fast).
>the auich driver uses the hardware and microtime() to compute the
>ac97 link rate. The GENERIC kernel uses kern.timecounter.hardware=ACPI-Fast,
>where as the GENERIC.NOACPI uses kern.timecounter.hardware=i8254.
> Anyone have any suggestions on how to debug this? Here are
>some links to dmesg output:
> GENERIC: http://yogi.pdl.cmu.edu/~chuck/40/dmesg-gen.txt
> GENERIC.NOACPI: http://yogi.pdl.cmu.edu/~chuck/40/dmesg-noacpi.txt
The clock on my alpha with /current runs too fast. Could it be related?
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