Messages in this thread | | | Subject | Re: Can not play audio with screen off | From | Nishanth Menon <> | Date | Mon, 16 May 2016 09:22:46 -0500 |
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On 05/15/2016 02:31 PM, Pavel Machek wrote: > Hi! > > I'm playing some more with N900, this time I'd like to use it as a > alarm clock... > > And now I realized I can not, because system performance is so > horrible with screen off that mpg123 + pulseaudio skips horribly. This > is without tweaking serial parameters, so CPU is definitely not going > into the idle/off modes. > > Loading CPU fixes the issue (I used cat /dev/zero > /dev/null). > > Hmm. And it seems to work better if I ssh in and launch mpg123 > remotely. Weird. > > Kernel 4.5-rc0. Will try on different ones. > > Any ideas? Is there interface to tell kernel that better performance > is needed for a while? >
pm_qos cpu_dma_latency? Drivers will have to be properly instrumented with appropriate latency values -> this will control the depth in C states that the system will attempt. NOTE: it is a dual edged sword, bad configurations can result in none of the C-states being entered.
-- Regards, Nishanth Menon
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