Hello, > the ALSA documentation is incomplete and in many cases incorrect
Do you happen to remember off hand which parts are incorrect? I think we should report them to the ALSA project. - PM On Sun, 19 Feb 2023, 13:53 Ted Felix, <t...@tedfelix.com> wrote: > We rely completely on ALSA for timer stuff. The key routine for > setting the timer in RG is: > > AlsaDriver::setCurrentTimer() > > Unless there is a bug in there (which there may very well be, the > ALSA documentation is incomplete and in many cases incorrect), the > problems tend to be due to bugs in ALSA or the kernel. They usually get > sorted over time by the ALSA folks. If they notice them. This one > seems like an interesting combination of requirements to reproduce and > thus might fly under their radar. > > I recommend building the latest kernel and seeing if that fixes the > issue. My three-year-old Debian/Ubuntu oriented notes are here if you > need: > > http://www.tedfelix.com/linux/kernel-build.html > > In general, it's really easy to do. > > If it's still there, a bug report for the ALSA folks seems like the > way to go. They can help find the issue in ALSA, or even in Rosegarden > if that's where the problem is. > > Ted. > > On 2/11/23 4:42 AM, Will Godfrey wrote: > > Recently I found Rosegarden was losing the timer source, and the > transport was > > freezing - sometimes for nearly a second after which it would send a > bunch of > > notes, then carry on as normal. > > > > It was some time before I realised it only happened on my Ryzen 5 > machine (the > > one I use for music) and not on my office Intel one. I hadn't made any > changes > > to the system and got sidetracked into thinking maybe I'd somehow > managed to > > get infected with some malware. However I eventually remembered I'd done > a > > normal devuan update. The only significant change was the Linux kernel > V5.10 to > > V 6.1. Rolling that back cured the problem. > > > > Asking some questions on-line identified the problem. > > > > First off, I use the RT-Preemt kernel - the 'normal' one doesn't have > the issue > > at all. > > > > Secondly, the Ryzen has the AMD equivalent of hyper-threading, my older > Intel > > doesn't. > > > > Finally, since Linux V5.12 the scheduler has been modified to allow > dynamic > > preemption. Disabling this in the BIOS cures the problem, albeit with a > very > > small loss of performance. > > > > I wonder if there should be another look at how Rosegarden does it's > timing. I > > did try to set the timing source to the audio hardware. It seemed to > recognise > > it, but actually totally ignored it. Saving and reloading showed no time > source > > at all, yet still ran as if it was on System Timer. > > > > > _______________________________________________ > Rosegarden-user mailing list > Rosegarden-user@lists.sourceforge.net - use the link below to unsubscribe > https://lists.sourceforge.net/lists/listinfo/rosegarden-user >
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