Hi all,

I have some weird behavior with my Realtek ALC650F chip and it was suggested at Alsa-user (by Dominique Dumont) to post my case here. It may concern a bug in the via82xx driver. I've used the same subject at Alsa-user in case someone wants to check the discussion over there.

I'm trying to get all audio (44.1 kHz music and 48 kHz video) through my SPDIF link. I have succeeded at this. I am able to get bitperfect 44.1 kHz digital audio with MythMusic and I'm able to get bitperfect 48 kHz digital audio with mplayer. However, after playing 48 kHz material the system doesn't switch back to 44.1 kHz mode! It seems to be stuck at 48 kHz. The only way to trigger the system back into 44.1 kHz is to play some 44.1 kHz sample through the iec958 device (which will play the 44.1 kHz sample too fast at 48 kHz). After this I'm able to get 44.1 kHz digital audio through the analog device again. :|

These are the settings I'm using:

alsamixer ========= Unmute "IEC958" Set "IEC958 Playback AC97-SPSA" to 0 (0%)

MythTV (General) ================ Audio output device: ALSA:default SPDIF passthrough device: ALSA:iec958:{AES0 0x02} [x] enable AC3 to SPDIF passthrough [x] enable DTS to SPDIF passthrough

MythTV (Music) ============== Audio output device: default

Ubuntu 8.04 - Sound Preferences =============================== Everything set to: Intel ICH5 - IEC958

.asoundrc ========= pcm.!default { type plug slave.pcm "analog-hw" # slave.pcm "digital-hw" # slave.pcm "dmix-digital" }

ctl.!default { type hw card 0 }

pcm.analog { type plug slave.pcm "analog-hw" }

ctl.analog { type hw card 0 }

pcm.analog-hw { type hw card 0 ## The default value for device is 0, so no need to specify ## - Uncomment one of the below or create a new "device N" line as appropriate ## for your sound card or # device 1 # device 4 }

ctl.analog-hw { type hw card 0 }

pcm.digital-hw { type hw card 0 ## - Comment out "device 1" above and uncomment one of the below or create a ## new "device N" line as appropriate for your sound card or # device 1 # device 2 device 4 }

ctl.digital-hw { type hw card 0 }

pcm.dmix-digital { type dmix ipc_key 1235 slave { pcm "digital-hw" period_time 0 period_size 1024 buffer_size 4096 rate 48000 } }

ctl.dmix-digital { type hw card 0 }

mplayer config ============== monitoraspect=16:9 fs=yes vo=xv # ao=alsa ao=alsa:device=iec958 # ao=alsa:device=hw=0.4 # ao=alsa:device=spdif afm=hwac3

$ cat /proc/asound/card0/codec97#0/ac97#0-0 =========================================== 0-0/0: Realtek ALC650F

PCI Subsys Vendor: 0x1509 PCI Subsys Device: 0x9202

Capabilities : DAC resolution : 20-bit ADC resolution : 18-bit 3D enhancement : Realtek 3D Stereo Enhancement

Current setup Mic gain : +0dB [+0dB] POP path : pre 3D Sim. stereo : off 3D enhancement : off Loudness : off Mono output : MIX Mic select : Mic1 ADC/DAC loopback : off Double rate slots: 10/11 Extended ID : codec=0 rev=1 LDAC SDAC CDAC DSA=0 SPDIF DRA VRA Extended status : SPCV LDAC SDAC CDAC SPDIF=3/4 SPDIF VRA PCM front DAC : 44100Hz PCM Surr DAC : 44100Hz PCM LFE DAC : 44100Hz PCM ADC : 44100Hz SPDIF Control : Consumer PCM Copyright Category=0x2 Generation=1 Rate=44.1kHz SPDIF In Status : Not Locked

I hope someone can shed some light. :)

Bart