Hi, My fault.
This is what is in datasheets: >There are two option circuits for MIC to disable bias voltage. For >ALC650 ver.E or later, there is Vrefout-disabled function, so >bias voltage from Vrefout(pin28) is recommended as option2 circuit. >When MIC is shared with Center/LFE, software should >disable Vrefout. For ALC650 ver.C/ver.D, Vrefout-disabled function >is not implemented yet, so GPIO is used to switch bias >voltage as option1/option3 circuit. ALC650 ver. C, D and uses GPIO ALC650 ver. E and later can use GPIO or Vrefout (register MX74 MISCELLANEOUS CONTROL bit 12 - it is used similiar as GPIO), maybe all motherboards uses GPIO (but vrefout needs less components) and there is this too: >Vrefout Disable (Supported by the ALC650 Rev. E and Rev.F) >0: Vrefout is driven by the internal reference (Default) >1: Vrefout is in high-Z mode. >Software must set this bit to disable Vrefout output before MX6A.10 >is set (MIC1 and MIC2 are shared as Center and LFE output). Peter Zubaj ====================== REKLAMA ======================== Java Desktop System predstavuje prvu pouzitelnu alternativu voci Windows za poslednych 15 rokov, pretoze prinasa zákaznikom bezpecne a doveryhodne desktopove riesenie za zlomok ceny Windows. Viac informacii najdete na : http://www.somi.sk/sun/java_desktop.php ======================================================= ------------------------------------------------------- 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_id56&alloc_id438&op=click _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
