Messages in this thread | | | Date | Fri, 13 Jun 2008 20:28:13 +0200 | From | Takashi Iwai <> | Subject | Re: linux-next: Tree for June 12 |
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At Fri, 13 Jun 2008 21:56:31 +0200, Thomas Meyer wrote: > > Am Donnerstag, den 12.06.2008, 17:53 +1000 schrieb Stephen Rothwell: > > > Changes since next-20080611: > > > > Beginning with next-20080612 i've got no sound! > > git bisect told me that, the offending commit is cbc5a5b7d12b4d461bff132f76abc0d4f9f3d8fc (ALSA: hda - Add bdl_pos_adj option): > > I need to add the option bdl_pos_adj=0, to make sound work again, which gives this dmesg entry: > > [ 64.697747] hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj. > > The sound card is: > > $ cat /proc/asound/cards > 0 [NVidia ]: HDA-Intel - HDA NVidia > HDA NVidia at 0xfbff0000 irq 21 > > > $ /sbin/lspci -vv -s 00:06.1 > 00:06.1 Audio device: nVidia Corporation MCP55 High Definition Audio (rev a2) > Subsystem: Micro-Star International Co., Ltd. Unknown device 7250 > Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- > Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- > Latency: 0 (500ns min, 1250ns max) > Interrupt: pin B routed to IRQ 21 > Region 0: Memory at fbff0000 (32-bit, non-prefetchable) [size=16K] > Capabilities: <access denied> > Kernel driver in use: HDA Intel > Kernel modules: snd-hda-intel > > What makes me wonder is, that the commit says: > " The new option adds the size of the delay in frames. As default, > it's set to 1 -- that is, one sample delay. Even the hardware is > really correct, one sample delay is relatively harmless in comparison > with reporting wrong positions." > > Maybe my definition of "harmless" is not "no sound". > Would you please check this problem?
It was harmless for Intel and ATI hardwares :) We've not tested NVidia ones. Good that you caught it fast.
Could you check whether another value, e.g. bdl_pos_adj=32 works? Since the warning is shown with bdl_pos_adj=0, any position adjustment is necessary, but likely Nvidia hardware doesn't allow such a fine sample resolution like bdl_pos_adj=1.
Thanks,
Takashi
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