Messages in this thread | | | From | Andrew Rodland <> | Subject | Re: voluntary-preempt T3 latency spikes with fan speed change | Date | Mon, 11 Oct 2004 13:03:01 -0400 |
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torbenh@gmx.de wrote:
> > hi... > > i am seeing latency spikes (ie jack xruns) when the fan of my > asus l3d laptop changes speed. > > is there any chance to fix this ? > i have turned off acpi in the kernel, as this gives me latency spikes > all over. > > i am quite new to the VP patches, and want to help where i can. > > i also got a quite strange latency trace here: > > could someone sched some light on this please ? >
I can't say for certain, but I'm guessing that your laptop has a deeply broken BIOS that implements ACPI and suchlike by using SMM, which blocks out interrupts, and there's nothing, I believe, you can do about it. Disabling ACPI seems sensible; at least you can avoid causing these delays intentionally, but if some sensor interrupt triggers a flip into SMM to enable the fan, you're just screwed for a number of milliseconds.
Andrew
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