On Thu, 2007-08-30 23:43:26 +0200, Jan-Benedict Glaw <jbglaw@xxxxxxxxxx> wrote:
>
> Just out of interest, I ordered another, similar card (Ultron
> Octosound 7.1, lspci: "C-Media Electronics Inc CM8738 (rev 10)",
> /proc/asound/cards: "C-Media PCI CMI8738-MC8 (model 68)")
>
> Plugged all in, fired up speaker-test, everything seems to work right
> out of the box.
>
> Fired up an alsaplayer to play some FLAC. Switched on "Four Channel
> Mode" for a test, which nicely adds sound to the rear left/right
> outputs.
>
> After the FLAC ended, I fired up speaker-test again (and of course
> switched off "Four Channel Mode".) This time, it's different than
> before: front center/LFE, front left/right and side left/right are
> okay, but rear right/left are highly distorted.
Did this now:
* Power-cycle
* speaker-test
* dump registers (1)
* alsaplayer (simple stereo FLAC)
* dump registers (2)
* speaker-test
* dump registers (3)
Everything that's important to speaker-test should be the same in (1)
and (3), I guess. (Hand-crafted register disassembly at the end.)
(1):
00: 00 00 00 00
04: 10 e0 00 00
08: 0c 00 09 80
0c: 00 00 00 2b
10: 80 00 00 00
14: 00 80 00 80
18: a0 20 c0 08
1c: 00 00 00 00
20: 10 00 d8 00
24: 01 01 00 04
28: ff ff ff ff
2c: ff ff ff ff
30: 00 00 00 00
34: 00 00 00 00
38: 00 00 00 00
3c: 00 00 00 00
(2):
00: 00 00 00 00
04: 10 fc 00 00
08: 0f 00 09 00
0c: 00 00 00 2b
10: 80 00 00 00
14: 00 00 00 00
18: 20 a0 80 08
1c: 00 00 00 00
20: 10 00 d8 00
24: 01 01 00 04
28: ff ff ff ff
2c: ff ff ff ff
30: 00 00 00 00
34: 00 00 00 00
38: 00 00 00 00
3c: 00 00 00 00
(3):
00: 00 00 00 00
04: 10 fc 00 00
08: 0f 00 09 80
0c: 00 00 00 2b
10: 80 00 00 00
14: 00 80 00 80
18: a0 a0 c0 08
1c: 00 00 00 00
20: 10 00 d8 00
24: 01 01 00 04
28: ff ff ff ff
2c: ff ff ff ff
30: 00 00 00 00
34: 00 00 00 00
38: 00 00 00 00
3c: 00 00 00 00
Diff (1) -> (3):
--- alsa.post-speaker-test1 2007-08-31 10:19:26.000000000 +0200
+++ alsa.post-speaker-test2 2007-08-31 10:25:00.000000000 +0200
@@ -1,12 +1,12 @@
C-Media PCI CMI8738-MC8 (model 68) at 0x1800, irq 19
00: 00 00 00 00
-04: 10 e0 00 00
-08: 0c 00 09 80
+04: 10 fc 00 00
+08: 0f 00 09 80
0c: 00 00 00 2b
10: 80 00 00 00
14: 00 80 00 80
-18: a0 20 c0 08
+18: a0 a0 c0 08
1c: 00 00 00 00
20: 10 00 d8 00
24: 01 01 00 04
Register 0x04
~~~~~~~~~~~~~
Before: 0x07 << CM_ASFC_SHIFT | 0x00 << CM_DSFC_SHIFT | CM_BREQ
After: 0x07 << CM_ASFC_SHIFT | 0x07 << CM_DSFC_SHIFT | CM_BREQ
(DAC Sample Frequency changed)
Register 0x08
~~~~~~~~~~~~~
Before: CM_CHB3D5C | CM_SPDIF_SELECT1 | 0x03 << CM_CH1FMT_MASK | 0x00 << CM_CH0FMT_SHIFT
After: CM_CHB3D5C | CM_SPDIF_SELECT1 | 0x03 << CM_CH1FMT_MASK | 0x03 << CM_CH0FMT_SHIFT
(Ch0 Format changed)
Register 0x18
~~~~~~~~~~~~~
Before: CM_TXVX | CM_FM_EN | CM_AC3EN2 | CM_VIDWPPRT | CM_ENCENTER | CM_FLINKOFF
After: CM_TXVX | CM_FM_EN | CM_AC3EN2 | CM_VIDWPPRT | CM_SPDF_AC97 | CM_ENCENTER | CM_FLINKOFF
(SPDIF/Out changed from 44.1kHz to 48kHz)
My guess is that the change to SPDIF/Out frequency and DAC Sample
Frequency are annoying at best, but irrelevant here. Am I probably
right that the changed ch0 format is the cause of the distortion?
MfG, JBG
--
Jan-Benedict Glaw jbglaw@xxxxxxxxxx +49-172-7608481
Signature of: Alles sollte so einfach wie möglich gemacht sein.
the second : Aber nicht einfacher. (Einstein)
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