No sound with C-Media CMI8788

No sound with C-Media CMI8788

[Ozan Çağlayan]

Hi,

I have two bug reports about the $subject. One of the users had tested
it with 1.0.21 and still can get no sound with it. I'm attaching the
alsa-info output + relevant dmesg lines:


[    7.797723] CMI8788 0000:05:06.0: PCI INT A -> Link[APC1] -> GSI 16
(level, low) -> IRQ 16
[    7.797794] CMI8788 0000:05:06.0: PCI INT A disabled
[    7.941267] AV200 0000:05:06.0: PCI INT A -> Link[APC1] -> GSI 16
(level, low) -> IRQ 16
[    7.941335] AV200 0000:05:06.0: PCI INT A disabled
[    8.020782] CMI8787HiFier 0000:05:06.0: PCI INT A -> Link[APC1] ->
GSI 16 (level, low) -> IRQ 16
[    8.020849] CMI8787HiFier 0000:05:06.0: PCI INT A disabled


!!################################
!!ALSA Information Script v 0.4.56
!!################################

!!Script ran on: Tue Sep  1 15:56:18 UTC 2009


!!Linux Distribution
!!------------------

Pardus 2009


!!DMI Information
!!---------------

Manufacturer:      Not provided
Product Name:      Not provided


!!Kernel Information
!!------------------

Kernel release:    2.6.30.1-123
Operating System:  GNU/Linux
Architecture:      i686
Processor:         AMD Athlon(tm) 64 FX-57 Processor
SMP Enabled:       Yes


!!ALSA Version
!!------------

Driver version:     1.0.20
Library version:    1.0.20
Utilities version:  1.0.20


!!Loaded ALSA modules
!!-------------------

snd_mpu401


!!Sound Servers on this system
!!----------------------------

Pulseaudio:
      Installed - Yes (/usr/bin/pulseaudio)
      Running - Yes

Jack:
      Installed - Yes (/usr/bin/jackd)
      Running - No
!!Soundcards recognised by ALSA
!!-----------------------------

 1 [UART           ]: MPU-401 UART - MPU-401 UART
                      MPU-401 UART at 0x330, irq 10


!!PCI Soundcards installed in the system
!!--------------------------------------

05:06.0 Multimedia audio controller: C-Media Electronics Inc CMI8788
[Oxygen HD Audio]


!!Advanced information - PCI Vendor/Device/Susbsystem ID's
!!--------------------------------------------------------

05:06.0 0401: 13f6:8788
    Subsystem: 13f6:8788


!!Loaded sound module options
!!--------------------------

!!Module: snd_mpu401
enable : Y,N,N,N,N,N,N,N
id : <NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>,<NULL>
index : -2,-2,-2,-2,-2,-2,-2,-2
irq : 10,65535,65535,65535,65535,65535,65535,65535
pnp : Y,Y,Y,Y,Y,Y,Y,Y
port : 816,1,1,1,1,1,1,1
uart_enter : Y,Y,Y,Y,Y,Y,Y,Y


!!ALSA Device nodes
!!-----------------

crw-rw----  1 root audio 116, 32 Sep  1 04:22 /dev/snd/controlC1
crw-rw----  1 root audio 116, 40 Sep  1 04:22 /dev/snd/midiC1D0
crw-rw----  1 root audio 116,  1 Sep  1 04:22 /dev/snd/seq
crw-rw----  1 root audio 116, 33 Sep  1 04:22 /dev/snd/timer


!!ALSA configuration files
!!------------------------

!!System wide config file (/etc/asound.conf)

# PulseAudio plugin configuration

# Let's create a virtual device "pulse" for mixer and PCM

pcm.pulse {
    type pulse
    hint {
        description "PulseAudio Sound Server"
    }
}

ctl.pulse {
    type pulse
    hint {
        description "PulseAudio Sound Server"
    }
}

# Let's make it the default!

pcm.!default {
    type pulse
    hint {
        description "Default"
    }
}

ctl.!default {
    type pulse
    hint {
        description "Default"
    }
}



!!Aplay/Arecord output
!!------------

APLAY

**** List of PLAYBACK Hardware Devices ****

ARECORD

**** List of CAPTURE Hardware Devices ****

!!Amixer output
!!-------------

!!-------Mixer controls for card 1 [UART]

Card hw:1 'UART'/'MPU-401 UART at 0x330, irq 10'
  Mixer name    : ''
  Components    : ''
  Controls      : 0
  Simple ctrls  : 0


!!Alsactl output
!!-------------

--startcollapse--
state.UART {
    control {
    }
}
--endcollapse--


!!All Loaded Modules
!!------------------

Module
ppp_deflate
zlib_deflate
ppp_async
crc_ccitt
ppp_generic
slhc
ipv6
snd_hifier
snd_virtuoso
snd_cs4236
snd_oxygen
snd_oxygen_lib
snd_wavefront
snd_wss_lib
nouveau
ppdev
snd_seq_dummy
snd_seq_oss
snd_seq_midi_event
snd_seq
snd_opl3_lib
snd_hwdep
snd_pcm_oss
snd_mixer_oss
snd_pcm
snd_mpu401
snd_mpu401_uart
parport_pc
drm
snd_rawmidi
snd_seq_device
snd_timer
snd
pcspkr
agpgart
k8temp
snd_page_alloc
lp
ns558
i2c_algo_bit
soundcore
gameport
parport
i2c_nforce2
cdc_acm
asus_atk0110
brd
ata_generic
sata_nv
pata_amd
pata_acpi
libata

Re: No sound with C-Media CMI8788

[Clemens Ladisch]

Ozan Çağlayan wrote:
> I have two bug reports about the $subject. One of the users had tested
> it with 1.0.21 and still can get no sound with it.
> 
> CMI8788 0000:05:06.0: PCI INT A -> Link[APC1] -> GSI 16 (level, low) -> IRQ 16
> CMI8788 0000:05:06.0: PCI INT A disabled
> AV200 0000:05:06.0: PCI INT A -> Link[APC1] -> GSI 16 (level, low) -> IRQ 16
> AV200 0000:05:06.0: PCI INT A disabled
> CMI8787HiFier 0000:05:06.0: PCI INT A -> Link[APC1] -> GSI 16 (level, low) -> IRQ 16
> CMI8787HiFier 0000:05:06.0: PCI INT A disabled

This looks as if none of the drivers manages to detect a valid PCI
subvendor/device ID.

In the file sound/pci/oxygen/oxygen_lib.c, after the line containing
"subdevice = oxygen_read_eeprom(chip, 2);" (about line number 262),
please add the line

  printk(KERN_INFO "subdevice ID: %04x\n", subdevice);

and recompile the driver.  This should show what the actual subdevice ID
of your card is.


Best regards,
Clemens
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Re: No sound with C-Media CMI8788

[Clemens Ladisch]

I wrote:
> In the file sound/pci/oxygen/oxygen_lib.c, after the line containing
> "subdevice = oxygen_read_eeprom(chip, 2);" (about line number 262),
> please add the line
> 
>   printk(KERN_INFO "subdevice ID: %04x\n", subdevice);

I think the cause for your unknown subdevice ID is that your card does
not have an EEPROM chip.  (This is a feature, it saves you $0.25!)
In this case, adding the following lines at that place should make
the driver load correctly:

	if (subdevice == 0xffff)
		subdevice = 0x8788;


HTH
Clemens

Re: No sound with C-Media CMI8788

[Ozan Çağlayan]

Clemens Ladisch wrote On 02-09-2009 15:23:
> I wrote:
>   
>> In the file sound/pci/oxygen/oxygen_lib.c, after the line containing
>> "subdevice = oxygen_read_eeprom(chip, 2);" (about line number 262),
>> please add the line
>>
>>   printk(KERN_INFO "subdevice ID: %04x\n", subdevice);
>>     
>
> I think the cause for your unknown subdevice ID is that your card does
> not have an EEPROM chip.  (This is a feature, it saves you $0.25!)
> In this case, adding the following lines at that place should make
> the driver load correctly:
>
> 	if (subdevice == 0xffff)
> 		subdevice = 0x8788;
>   

Hi,

I'll prepare patched drivers and try to get feedback from the
complaining users. Just a side note: Both user confirms that the cards
was working when they were using the 20081203 snapshot. So it should
have been broken between that one and May 09.

Thanks!

Re: No sound with C-Media CMI8788

[Ozan Çağlayan]

Clemens Ladisch wrote:
> I wrote:
>   
>> In the file sound/pci/oxygen/oxygen_lib.c, after the line containing
>> "subdevice = oxygen_read_eeprom(chip, 2);" (about line number 262),
>> please add the line
>>
>>   printk(KERN_INFO "subdevice ID: %04x\n", subdevice);
>>     
>
> I think the cause for your unknown subdevice ID is that your card does
> not have an EEPROM chip.  (This is a feature, it saves you $0.25!)
> In this case, adding the following lines at that place should make
> the driver load correctly:
>
> 	if (subdevice == 0xffff)
> 		subdevice = 0x8788;
>   

Okay, that worked. But I assume that this is a device specific solution
right? If there are other cards without an EEPROM chip, forcing them to
0x8788 shouldn't make sense? How should this be correctly handled?

Thanks!

Re: No sound with C-Media CMI8788

[Clemens Ladisch]

Ozan Çağlayan wrote:
> Clemens Ladisch wrote:
> > 	if (subdevice == 0xffff)
> > 		subdevice = 0x8788;
> 
> Okay, that worked.

Applied, should soon appear in the stable 2.6.30.x kernel.

> But I assume that this is a device specific solution right?

If the CMI8788 chip does not find an EEPROM, it reports the default ID.

> If there are other cards without an EEPROM chip, forcing them to
> 0x8788 shouldn't make sense?

The Windows driver treats such a card as the reference design.  Only
such cards can omit the EEPROM and expect to be treated correctly.


Best regards,
Clemens
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