Re: DMA IRQ, or How To Prevent ipaq-sleep From Suspending A Zaurus Playing Music

On 9/14/06, Francesco Marchetti-Stasi <[email protected]> wrote:
>
> I've been searching for a while for the "official" way to stop
> ipaq-sleep from suspending my boxer while it was playing music (with
> mplayer).  Searching in the forums, on the wiki and with google only
> resulted in hacks I didn't like (e.g., wrapping mplayer in a script
> which stops and restarts ipaq-sleep).  I suspected I could use the IRQ
> parameter in ipaq-sleep configuration to solve the problem, but I wasn't
> able to find in /proc/interrupts an IRQ related to audio.  Yesterday I
> did some tests, and found out that setting IRQ = 18 in
> /etc/ipaq-sleep.conf works, namely, prevents suspending while playing
> music (and only when playing music, at least so far).
>
> Now, looking back in /proc/interrupts i found that IRQ 18 belongs to
> DMA.  I can imagine why this works, but still:
>
> - does anybody foresee any possible problems (i.e., unwanted blocks of
> suspending)?
>
> - why there is no IRQ for the audio system (which would give a far more
> elegant solution)? Does this depend on the OZ hardware?
>
> Having this answer, I would gladly write this piece of info in the wiki
>   / in the FAQ / wherever, since I am not the only one to look for such
> a solution.
>

I would also gretaly appreciate an answer to this as the "CPU
utilization" parameter to ipaq-sleep seems to do effectively nothing.
I have resorted to removing/renaming ipaq-sleep as I couldn't get it
not to start (*something* keeps starting it no matter what I try...).

-- 
Justin Patrin

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