lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 16 May 2016 17:06:50 +0200
From:	Pavel Machek <>
To:	Nishanth Menon <>
	kernel list <>,
	linux-arm-kernel <>,,,,,,,
Subject: Re: Can not play audio with screen off


> > 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.

Ok, so far it looks like artefact of -rc0 kernel. Lets see if it


(cesky, pictures)

Powered by blists - more mailing lists