From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Courtier-Dutton Subject: Re: ALC650 GPIO bits Date: Wed, 03 Mar 2004 15:48:54 +0000 Sender: alsa-devel-admin@lists.sourceforge.net Message-ID: <4045FE66.1040701@superbug.demon.co.uk> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Takashi Iwai Cc: alsa-devel@lists.sourceforge.net List-Id: alsa-devel@alsa-project.org Takashi Iwai wrote: > 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