Hi,
it seems that some mobo with ALC650 uses GPIO 0 as the mic bias +5V.
in ac97_patch.c, the GPIO 0 is turned on/off in conjunction with the mic/center sharing switch, but this handling appears only for the old ALC650 revision (D or older).
interestingly, there is a report that even a mobo with the newer revision of ALC650 has this GPIO bit. now, the question is why GPIO is not handled with the revision E and F. i can't remember the reason (google gives no good info) -- does anyone still know?
is there any mobo with a side effect of this GPIO?
Takashi
The best source I found for ALC650 info is from the Realtek web site.
http://www.realtek.com.tw/downloads/dlac97-1.aspx
1) They have a datasheet for the ALC650, although the datasheets have errors in them.
http://www.realtek.com.tw/downloads/downloads1-3.aspx?lineid=5&famid=12&series=8&Spec=True&refdesign=True
2) They have their own version of the alsa-driver, which you can look at to see what they do about things like this. Just download their linux driver. It is alsa-driver source code.
http://www.realtek.com.tw/downloads/dlac97-2.aspx?lineid=5&famid=12&series=8&Software=True#8Unix%20(Linux)
Cheers James
------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
