Copying back the bug log with some side conversations between David and me:
David wrote: On 04/22/2014 06:16 PM, Felipe Sateler wrote: > On Fri, Apr 18, 2014 at 8:15 PM, David Smith <sidic...@gmail.com> wrote: > > On 04/18/2014 06:01 PM, Felipe Sateler wrote: > >> > >> This may be a problem of too high CPU usage. Can you try changing the > >> resample-method key in daemon.pa? > >> > >> I think the 'trivial' resampler should be the less cpu-hungry, so you > >> should probably try that first. > >> > > > > That doesn't make any sense though, my laptop is an 8-core laptop that's > > sitting idle almost all the time when the crackling/popping happens. > > > > It *COULD* be something related to the frequency of my CPU changing.. I > > realized that the new intel power management stuff is clocking my CPU > > all over the place.. In the old days it would only cycle between 3 or 4 > > different frequencies and it would be very slow about reclocking.. Now > > it's almost instantaneous reclocking of the CPU to save power and it's > > got a lot of different frequencies it can clock to.. > > > > If I set my CPU to a fixed frequency, either the lowest or the highest > > possible frequency the CPU supports, the entire problem disappears. > > Possibly the cpu frequency changes cause pulseaudio or alsa to loose sync. > > > > > But I'm not going to run my CPU on a fixed frequency like that because > > it's always either inconveniently slow or a power hog. So I need to use > > the configuration change to pulseaudio described above which seems to > > fix the problem entirely. > > By the configuration change you mean the one I suggested or the tsched > one you suggested earlier in the bug report? tsched=0 And I wrote: On Wed, Apr 23, 2014 at 6:54 PM, David Smith <sidic...@gmail.com> wrote: > On 04/23/2014 04:43 PM, David Smith wrote: >> The other really weird thing about it.. Whenever I seek in a >> audio/video file.. It will start crackling for a little bit and then >> go away.. And it happens everytime I seek no matter where in the file >> I go. Also if I play an audio file that's 30 mins long, it only >> crackles for the first 1-10 seconds or so and runs fine after that no >> matter what other things I do on the PC. -David > > That's why I thought it had something to do with the CPU clocking. > When you seek in an audio/video track, it causes the CPU usage to spike > and the CPU gets reclocked. > But I've got an 8-core Ivy Bridge CPU here, it's not a problem of the > CPU being too slow. > > When I set my CPU to a single frequency so it's not scaling up and down > to save power, then the crackling is almost completely gone.. Not > entirely though, but it also slaughters my battery life so it's not > worth it at all. > > So the best solution, by far, is tsched=0 and make sure all my power > management is enabled. Hmm, so we should probably document this in the README.Debian too. On Wed, Apr 23, 2014 at 9:51 PM, David Smith <sidic...@gmail.com> wrote: > On 04/23/2014 05:25 PM, Felipe Sateler wrote: >> Hmm, so we should probably document this in the README.Debian too. Do >> you mind if forward this discussion back to the log? > Well.. I just installed 4.0-6~bpo7+1 of pulseaudio and made sure it > overwrote my config files. > There's no tsched=0 in there, I did a reboot and I'm not hearing any > crackling. > > I know i've installed the backport of pulseaudio shortly after wheezy > came out and it still had crackling.. This must have fixed it within the > past year or so. > > Gonna try a few games and report back in a few days. > > I knew it was pulseaudio and not the drivers :D. > > -David > > -- Saludos, Felipe Sateler -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
