On Sat, Dec 10, 2022 at 05:17:42PM +0100, Marek Marczykowski-Górecki wrote: > On Sat, Dec 10, 2022 at 02:00:06AM +0100, Marek Marczykowski-Górecki wrote: > > On Fri, Dec 09, 2022 at 01:40:15PM +0100, Marek Marczykowski-Górecki wrote: > > > On Fri, Dec 09, 2022 at 09:10:19AM +0100, Takashi Iwai wrote: > > > > On Fri, 09 Dec 2022 02:27:30 +0100, > > > > Marek Marczykowski-Górecki wrote: > > > > > > > > > > Hi, > > > > > > > > > > Under Xen PV dom0, with Linux >= 5.17, sound stops working after few > > > > > hours. pavucontrol still shows meter bars moving, but the speakers > > > > > remain silent. At least on some occasions I see the following message in > > > > > dmesg: > > > > > > > > > > [ 2142.484553] snd_hda_intel 0000:00:1f.3: Unstable LPIB (18144 >= 6396); disabling LPIB delay counting > > > > Hit the issue again, this message did not appear in the log (or at least > > not yet). > > > > (...) > > > > > > In anyway, please check the behavior with 6.1-rc8 + the commit > > > > cc26516374065a34e10c9a8bf3e940e42cd96e2a > > > > ALSA: memalloc: Allocate more contiguous pages for fallback case > > > > from for-next of my sound git tree (which will be in 6.2-rc1). > > > > This did not helped. > > > > > Looking at the mentioned commits, there is one specific aspect of Xen PV > > > that may be relevant. It configures PAT differently than native Linux. > > > Theoretically Linux adapts automatically and using proper API (like > > > set_memory_wc()) should just work, but at least for i915 driver it > > > causes issues (not fully tracked down yet). Details about that bug > > > report include some more background: > > > https://lore.kernel.org/intel-gfx/Y5Hst0bCxQDTN7lK@mail-itl/ > > > > > > Anyway, I have tested it on a Xen modified to setup PAT the same way as > > > native Linux and the audio issue is still there. > > > > > > > If the problem persists, another thing to check is the hack below > > > > works. > > > > Trying this one now. > > And this one didn't either :/ > > When it stopped working, I did two things: > 1. switched audio profiles ("configuration" tab in pavucontrol) several > times; this on its own did not helped > 2. reloaded sound related modules, but did not loaded them all back (see > attached list before and after). > > After this, it worked again for a few minutes. Not sure if/which the above > actions were relevant, tho... > > Another observation: when it stops working, it's never during a > playback. It's always that at some point starting an audio stream > results in a silence. Any other ideas? Or maybe there is another patch I should try? -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab
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