On Thu, 25 Feb 2016 22:57:34 +0100, Ville Syrjälä wrote: > > On Thu, Feb 25, 2016 at 09:28:59PM +0100, Takashi Iwai wrote: > > On Thu, 25 Feb 2016 20:19:08 +0100, > > Ville Syrjälä wrote: > > > > > > Hi, > > > > > > My investigation into some sporadic i915 runtime PM failures seem to > > > point the finger at snd-hda-intel. > > > > > > I just tried to play around unloding and reloading snd-hda-intel and > > > sometimes I get snd-hda-intel loaded with runtime PM supposedly enabled, > > > but actually the device won't runtime suspend. At which point frobbing > > > with power/control is enough to kick it back into submission. > > > > Which platform are you testing? If it's SKL, BSW or later, multiple > > codecs are on a single HD-audio bus. In general, you have to adjust > > the runtime PM of all these codecs in addition to the runtime PM of > > the controller. Some of them are immediately runtime PM enabled but > > some of them aren't, left the default as is. > > This was on a HSW. OK, then the HDMI/DP has its own controller. > I also have CONFIG_SND_HDA_POWER_SAVE_DEFAULT=1 which I presume should > enable codec power saving by deafault? Yes, unless something overwrites it. Often there are udev rules to override something for that. > > It might be that your desktop environment adjusts the runtime PM of > > HD-audio stuff, often depending on the power state. But when you > > reload, this adjustment is also lost, so you'd have to adjust > > manually. > > There's no desktop environment. Well, unless you count systemd as such. > As you can see from the log I included at least the pci device power/control > file stayed at 'auto' the whole time until I flipped it to 'on' and then > back to 'auto' to fix the problem. It implies that the problem is the PM layer itself... > Also the problem didn't happen on every reload AFAICS, so there's > something rather non-deterministic happening. In anyway, please check the runtime PM status in the codec devices, i.e. /sys/bus/hdaudio/devices/*. The controller runtime PM is activated only when the codec is power-saved. If the codec is in runtime-suspended but the controller still doesn't, put some debug codes in azx_runtime_idle() in sound/pci/hda/hda_intel.c, whether any EBUSY condition there hits. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
