On Sat, 2007-09-01 at 00:53 -0400, Dave Vasilevsky wrote: > When playing audio with the snd-powermac driver on a PowerMac G4 > Quicksilver (Tumbler audio) the sound hangs after a few seconds. > > - The time before a hang varies from one second to one minute. > - Killing the process playing sound and starting again will allow > sound to continue (for a few more seconds). > - Many different userspace audio systems and different audio sources > all encounter this bug--definitely a kernel issue. > - Vanilla kernels from 2.6.20 up to git HEAD show this behavior. > Others have reported this bug on distro kernels.[1][2] > > I used git-bisect to find that the regression first occured after git > commit 68a64357d15ae4f596e92715719071952006e83c > "powerpc: Merge 32 and 64 bits asm-powerpc/io.h" by benh.[3] > > My kernel debugging skills are admittedly limited, but I scattered > printks through some relevant files and found that audio stops just as > snd_pmac_pcm_update in sound/ppc/pmac.c encounters a struct dbdma_cmd > with xfer_status == 0x8088. Normally it should be 0x84 (ie: ACTIVE | > RUN) or 0x0. Hopefully this means something to somebody. I'm willing > to do more debugging if more information is necessary, kindly CC me on > replies to this message.
.../... strange. I'm travelling at the moment. I'll try to have a look, but don't hesistate to "ping" me if you don't hear from me in the upcoming couple of weeks. Cheers, Ben. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/