At Wed, 7 Jan 2009 12:57:57 +0100, Salvatore Filippone wrote: > > On Wed, Jan 7, 2009 at 12:45 PM, Takashi Iwai <tiwai@xxxxxxx> wrote: > > At Mon, 29 Dec 2008 19:45:25 +0100, > Nigel Henry wrote: > > > > UPDATE: Salvatore has found a workaround, so that both codecs are > detected > > correctly. Any help from alsa developers for a permanent fix would be > > appreciated. See workaround at bottom of post. > > > (snip) > > <Quoting Salvatore> > > Saturday 16:05:58 > > > > Ok, I finally found a workaround. > > According to the thread starting at > > http://thread.gmane.org/gmane.linux.alsa.devel/58849 > > I grabbed the latest source code > alsa-driver-1.0.18a.17.g27a32.139.g6e583/ > > compiled with --with-debug=verbose and got the message > > Dec 27 15:13:06 localhost kernel: ALSA > > /mnt/travel/ALSA/alsa-driver-1.0.18a.17.g27a32.139.g6e583/pci/hda/../../ > alsa-kernel/pci/hda/hda_intel.c:779: > > codec_mask = 0x2 > > > > I then figure out that the sound device was at codec#0 when it worked, > > therefore I changed snd_hda_intel.c by forcing codec_mask > > if (!chip->codec_mask) { > > chip->codec_mask = azx_readw(chip, STATESTS); > > chip->codec_mask=0x03; > > snd_printdd("codec_mask = 0x%x\n", chip->codec_mask); > > } > > > > And now the sound works correctly. > > Of course this opens the question of why azx_readw does not return a > > correct mask; > > Well, this implies a BIOS bug. This value is set by BIOS to indicate > which codec slot is available. > > > maybe the developers will be interested and/or will suggest a > > fix that is a little more elegant/widely applicable? And why did the > base > > code work just once, for no clear reason ? (I did not have debug=verbose > at > > that time, so I don't have detailed messages in the system log). > > Not sure about this as I didn't track this bug. > When did it work once? Is the device enabled by BIOS properly? > > To summarize: > > 1. It always did work with FC7. I guess it worked likely just casually. The old driver didn't clear the register bit before probing, so it got uninitialized bits. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
