On 2011-04-07 12:10, Takashi Iwai wrote: > At Thu, 7 Apr 2011 16:54:50 +0800, > Xu, Andiry wrote: >> >> Hi Takashi, >> >> Currently I encountered an HD audio issue reported by customer on a >> Lenovo x100e system. Sometimes, but not always, when starting a >> recording stream through the HDA controller, the controller generates a >> large amount of interrupts (~40 000 interrupts per second). After this >> has happened, jack sense (i e unsolicited events from the codec) stops >> working until the next system reboot.
This seems more reproducible now than it was a while ago, now it seems to happen more often than not. >> SD0STS returns a FIFO error (0x28) in interrupt handler. The interrupt >> service routine acknowledges this error but does not do anything to >> counteract the root cause to the problem, so it appears again and again. >> Restarting the stream does not seem to help. Enable MSI or not does not >> help either. >> >> The issue occurs on 2.6.35 and 2.6.38-rc8+, have not tried latest kernel >> yet but I think it's also there. FIFO error indicates FIFO overrun >> occurring while the RUN bit is set, but the driver simply acknowledge >> and clear the error. I wonder what the root cause and the right >> treatment are in this case. Any suggestions? Brainstorming: 1) We could try adding udelays at random places. 2) There are a few workarounds for different chips already in hda_intel.c, maybe try applying them here as well. Does that make sense to either of you? > FIFO_ERR is actually never handled, so basically we can ignore. > Simply disabling it like below works around your problem? > > Of course, a proper handling of FIFO error would be better, but > this may need more code rewrites. This does not fix the error in question, it removes the interrupts all right, but neither recording nor jack sense starts to work. -- David Henningsson, Canonical Ltd. http://launchpad.net/~diwic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/741825 Title: Lenovo x100e: Intermittent record and jack sense failure -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
