At Wed, 29 Aug 2007 17:34:19 +0200,
Thomas Richter wrote:
>
> Hi folks,
>
> the patch below, to be applied to sound/pci/hda/patch_sigmatel.c fixes the audio
> output on the Fujiutsu/Siemens lifebook T4210 (and probably on others). It is
> suitable for the kernel 2.6.23-rc4 (and probably others).
>
> Without the patch, audio fails and the hda driver fails to load with
>
> No available DAC for pin 0x0
>
> However, the indicated pin has no connections in first place and thus should be ignored.
> With the patch applied audio output works fine.
The problem is that nid = 0 is used. So, your patch just hides
another bug.
Please check whether the bug still exists with git.kernel.org
perex/alsa.git mm branch. If still there, build with
CONFIG_SND_DEBUG and show the autoconfig output.
thanks,
Takashi
>
> Here's the patch:
>
> /* snip */
> --- patch_sigmatel_old.c 2007-08-29 17:17:51.000000000 +0200
> +++ patch_sigmatel.c 2007-08-29 17:21:25.000000000 +0200
> @@ -1250,6 +1250,16 @@
> nid = cfg->line_out_pins[i];
> conn_len = snd_hda_get_connections(codec, nid, conn,
> HDA_MAX_CONNECTIONS);
> + /* FIX THOR: For some hardware (notably the Fujiutsu/Siemens T4210
> + ** lifebook), we have nids with no pins whatsoever. Ignore
> + ** them.
> + */
> + if (conn_len == 0) {
> + snd_printk(KERN_ERR "%s: Found zero connections for pin 0x%0x "
> + "ignoring it.\n",__func__,nid);
> + continue;
> + }
> +
> for (j = 0; j < conn_len; j++) {
> wcaps = snd_hda_param_read(codec, conn[j],
> AC_PAR_AUDIO_WIDGET_CAP);
> /* snip */
>
> Greetings,
> Thomas
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