snd_hda, codec attaching randomly?
David Demelier
demelier.david at gmail.com
Thu Mar 10 07:44:57 UTC 2011
Hello,
I've setup a brand new computer from scratch, it has two HDMI output
(via the on board and via the ati graphic card) with one codec for the
main board.
Usually I have these pcm :
pcm0: <HDA ATI R6xx HDMI PCM #0 HDMI> at cad 0 nid 1 on hdac0
pcm1: <HDA Realtek ALC888 PCM #0 Analog> at cad 0 nid 1 on hdac1
pcm2: <HDA Realtek ALC888 PCM #1 Analog> at cad 0 nid 1 on hdac1
pcm3: <HDA Realtek ALC888 PCM #2 Digital> at cad 0 nid 1 on hdac1
pcm4: <HDA Intel G45 HDMI PCM #0 DisplayPort> at cad 3 nid 1 on hdac1
But sometime when I boot the pcm4 disappear, with a lot of :
hdac1: hdac_widget_connection_parse: nid=2 WARNING: zero cnid entnum=4
j=0 index=0 entries=17 found=0 res=0x00000000
hdac1: hdac_widget_connection_parse: nid=2 WARNING: zero cnid entnum=4
j=1 index=0 entries=17 found=1 res=0x00000000
hdac1: hdac_widget_connection_parse: nid=2 WARNING: zero cnid entnum=4
j=2 index=0 entries=17 found=2 res=0x00000000
hdac1: hdac_widget_connection_parse: nid=2 WARNING: zero cnid entnum=4
j=3 index=0 entries=17 found=3 res=0x00000000
[.. snip ..]
Here you can see the normal dmesg file :
http://files.malikania.fr/normal.txt
And here when the pcm disappear :
http://files.malikania.fr/notnormal.txt
A simple diff from the files show some weird things:
diff -ub normal.txt notnormal.txt
--- normal.txt 2011-03-10 08:06:14.000000000 +0100
+++ notnormal.txt 2011-03-10 08:06:18.000000000 +0100
@@ -116,24 +116,90 @@
hdac0: HDA Codec #0: ATI R6xx HDMI
pcm0: <HDA ATI R6xx HDMI PCM #0 HDMI> at cad 0 nid 1 on hdac0
hdac1: HDA Codec #0: Realtek ALC888
-hdac1: HDA Codec #3: Intel G45 HDMI
+hdac1: HDA Codec #3: Intel Q57 HDMI
+hdac1: hdac_widget_connection_parse: nid=2 WARNING: zero cnid entnum=4
j=0 index=0 entries=17 found=0 res=0x00000000
+hdac1: hdac_widget_connection_parse: nid=2 WARNING: zero cnid entnum=4
j=1 index=0 entries=17 found=1 res=0x00000000
[... message repeated a lot of time ...]
pcm1: <HDA Realtek ALC888 PCM #0 Analog> at cad 0 nid 1 on hdac1
pcm2: <HDA Realtek ALC888 PCM #1 Analog> at cad 0 nid 1 on hdac1
pcm3: <HDA Realtek ALC888 PCM #2 Digital> at cad 0 nid 1 on hdac1
-pcm4: <HDA Intel G45 HDMI PCM #0 DisplayPort> at cad 3 nid 1 on hdac1
Why does the HDMI codec is renamed to Q57?
I didn't tweak snd_hda(4) much, I only added the following in my
/boot/devices.hints to get a proper jack-sense on my front panel:
hint.hdac.1.cad0.nid27.config="as=1 seq=15"
Cheers,
--
David Demelier
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