Difference between revisions of "Problem with broken sound on some ThinkPads"

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Information about the phenomena of broken sound on some ThinkPad models.
 
Information about the phenomena of broken sound on some ThinkPad models.
  
−
==Problem description==
+
==Dual sound chip problem description==
−
Even though the sound chip is a Crystal SoundFusion 4610, you'll have to use the cs4236 driver to enable sound on this machine, since this driver supports the CS4239 emulation that the 4610 chip offers.
+
There are two sound chips in these machines, a PCI based [[CS4610|Crystal SoundFusion 4610]], and an ISA based [[CS4239|Crystal SoundFusion 4239]].
  
−
==Affected Models==
+
The Linux drivers for the CS4610 (both OSS and ALSA) expect to find it paired with an AC'97 codec chip, while instead the CS4610 is paired with the ISA CS4239. This was done, because at the time this allowed DOS games to output sound using SoundBlaster Pro emulation.
−
===Affected 6xx/7xx Models===
 
−
*ThinkPad {{600E}}
 
−
*ThinkPad {{770X}}, {{770Z}}
 
−
 
 
−
===Unaffected 6xx/7xx Models===
 
−
*ThinkPad {{600X}}
 
  
−
The ThinkPad 600X sports a newer CS4624 sound chip, which apparently has the AC'97 codec part that the Linux driver requires.
+
To get sound under Linux you will have to use the OSS cs4232 or ALSA snd-cs4236 driver for the ISA soundchip instead.
−
 
 
−
===Unrelated 6xx/7xx models===
 
−
* ThinkPad {{600}}, {{600D}}
 
−
* ThinkPad {{770}}, {{770D}}, {{770E}}, {{770ED}}
 
−
 
 
−
According to one report, these models have only an ISA-based sound chip, namely a CS4237B.
 
−
Just use the snd-cs4236 ALSA driver or cs4232 OSS driver for these models.
 
−
 
 
−
==Status==
 
−
The PCI chip that you see in lspci (in my 770x case 4610) is the DSP half of the soundcard.  You also need a codec to do conversion between digital and analog, audio routing, etc.  The CS46xx driver expects to find an [http://www.intel.com/design/chipsets/audio/ AC'97-compatible] chip addressible through the PCI Cirrus logic chip to do these tasks.
 
−
 
 
−
However, in the affected laptops there is no AC'97 chip.  Instead the sound chip has an integrated ISA-based soundcard to do these tasks as well as providing legacy app support.  The cs46xx driver cannot find the AC'97 chip, nor can it support the ISA part for codec duties, so it dies with an error.  The current solution is to ignore the PCI part entirely and use sound though the legacy ISA part only, either through the ALSA snd-cs4236 or OSS cs4232 driver.
 
−
 
 
−
Alternatively, I have tried removing the dependency on the existence of an AC'97 codec in the cs46xx driver, theory being that it may be possible to use the cs4236 driver for the mixing functions.  This resulted in the driver loading and detecting all the resources of the cs4610, however interrupt issues seemed to be preventing it from outputting sound.
 
  
 
A good thread on the problem can be found in the [http://www.mail-archive.com/alsa-devel@lists.sourceforge.net/msg01181.html alsa-devel mailing list]
 
A good thread on the problem can be found in the [http://www.mail-archive.com/alsa-devel@lists.sourceforge.net/msg01181.html alsa-devel mailing list]
  
−
Here's some more information about sound hardware in the 600 series:
+
===Affected Models===
−
The 600 series has not one, not two, but THREE chips that look like sound cards to Linux. The actual Crystal chip is one of them, the mwave is another, and the video chipset has a DSP that can be used as sound circuitry if a designer opted to do so.
+
*ThinkPad {{600E}}
 +
*ThinkPad {{770X}}, {{770Z}}
  
−
==Solutions==
+
===Solutions===
−
===Activating the devices===
+
====Activating the devices====
 +
{{Todo|This should no longer be necessary with any recent distribution, if anyone can validate, and if so remove this section}}
 
First you must make sure that the sound devices are activated.
 
First you must make sure that the sound devices are activated.
  
 
Disable "Quick Boot" in your ThinkPad BIOS, otherwise the sound devices will not be activated by the BIOS.
 
Disable "Quick Boot" in your ThinkPad BIOS, otherwise the sound devices will not be activated by the BIOS.
−
To enter the BIOS, power cycle your ThinkPad and press F1 when the ThinkPad screen shows.
+
To enter the BIOS, press F1 before switching the ThinkPad on and until the first beep is heard.
  
 
You can also manually activate the sound card once booted:
 
You can also manually activate the sound card once booted:
 
* With apm and pnpbios, this is done with setpnp from the pcmcia package:
 
* With apm and pnpbios, this is done with setpnp from the pcmcia package:
−
  {{cmdroot|setpnp 0x0e on}}
+
:{{cmdroot|setpnp 0x0e on}}
−
  {{cmdroot|setpnp 0x0f on}}
+
:{{cmdroot|setpnp 0x0f on}}
  
 
* With acpi and pnpacpi, use these commands:
 
* With acpi and pnpacpi, use these commands:
−
  {{cmdroot|echo 'activate' > /sys/devices/pnp0/00:05/resources}}
+
:{{cmdroot|echo 'activate' > /sys/devices/pnp0/00:05/resources}}
−
  {{cmdroot|echo 'activate' > /sys/devices/pnp0/00:06/resources}}
+
:{{cmdroot|echo 'activate' > /sys/devices/pnp0/00:06/resources}}
 +
 
 +
It seems that with very new kernels and ACPI enabled, you will need to manually enable the device even if you have correctly disabled "Quick Boot".
  
 
This only works with newer kernels that fully support pnpacpi, and provided that [http://bugzilla.kernel.org/show_bug.cgi?id=3912 this patch] has been applied (applied to Linus' tree in july 2005).
 
This only works with newer kernels that fully support pnpacpi, and provided that [http://bugzilla.kernel.org/show_bug.cgi?id=3912 this patch] has been applied (applied to Linus' tree in july 2005).
  
−
It seems that the default dma numbers change when pnpacpi is used (to dma1=1 dma2=5, for instance).
+
It seems that the default dma numbers change when pnpacpi is used (to dma1=1 dma2=3, for instance).
  
−
===Using ALSA===
+
If you're using acpi and pnpacpi, you can see which resources the sound card is using like this:
 +
:{{cmdroot|cat /sys/devices/pnp0/00:05/resources}}
 +
:{{cmdroot|cat /sys/devices/pnp0/00:06/resources}}
 +
 
 +
====Using ALSA====
 
Compile the sound driver as a module and load it after everything else.
 
Compile the sound driver as a module and load it after everything else.
 
You can add the following line to a boot script, ie. {{path|rc.local}} for that:
 
You can add the following line to a boot script, ie. {{path|rc.local}} for that:
 
  /sbin/modprobe snd-cs4236 index=0 port=0x530 cport=0x538 irq=5 dma1=1 dma2=0 isapnp=0
 
  /sbin/modprobe snd-cs4236 index=0 port=0x530 cport=0x538 irq=5 dma1=1 dma2=0 isapnp=0
  
−
This is reported to work at least with kernel 2.6.9.
+
This is reported to work at least with kernel 2.6.15.
−
 
 
−
===Using OSS===
 
−
Add the following line to a boot script, ie. {{path|rc.local}}:
 
−
modprobe sound
 
−
insmod ad1848
 
−
insmod uart401
 
−
insmod cs4232 io=0x530 irq=5 dma=1 dma2=0
 
  
−
In case an insmod or modprobe of cs4232 fails with the following error appearing at the console, via dmesg, or in {{path|/var/log/messages}}, double-check you have quick boot disabled!
+
On the 770x using kernel 2.6.16/2.6.17 you may try this:
−
  modprobe: FATAL: Error inserting cs4232: No such device
+
  /sbin/modprobe snd-cs4232 port=0x530 cport=0x120 irq=5 dma1=1 dma2=0 isapnp=0
  
−
====Audio loops====
+
There is a [[Script for configuring the CS4239 sound chip in PnP mode|nice script]] which can do all this for you, including activation of the device and detecting the correct resource settings to use.
−
If your OSS module loads like it should, but audio loops or sounds choppy then reloading the module should help:
 
−
{{cmdroot|rmmod cs4232 && modprobe cs4232}}
 

Latest revision as of 21:25, 9 August 2014

Information about the phenomena of broken sound on some ThinkPad models.

Dual sound chip problem description

There are two sound chips in these machines, a PCI based Crystal SoundFusion 4610, and an ISA based Crystal SoundFusion 4239.

The Linux drivers for the CS4610 (both OSS and ALSA) expect to find it paired with an AC'97 codec chip, while instead the CS4610 is paired with the ISA CS4239. This was done, because at the time this allowed DOS games to output sound using SoundBlaster Pro emulation.

To get sound under Linux you will have to use the OSS cs4232 or ALSA snd-cs4236 driver for the ISA soundchip instead.

A good thread on the problem can be found in the alsa-devel mailing list

Affected Models

Solutions

Activating the devices

TODO
This should no longer be necessary with any recent distribution, if anyone can validate, and if so remove this section

First you must make sure that the sound devices are activated.

Disable "Quick Boot" in your ThinkPad BIOS, otherwise the sound devices will not be activated by the BIOS. To enter the BIOS, press F1 before switching the ThinkPad on and until the first beep is heard.

You can also manually activate the sound card once booted:

  • With apm and pnpbios, this is done with setpnp from the pcmcia package:
# setpnp 0x0e on
# setpnp 0x0f on
  • With acpi and pnpacpi, use these commands:
# echo 'activate' > /sys/devices/pnp0/00:05/resources
# echo 'activate' > /sys/devices/pnp0/00:06/resources

It seems that with very new kernels and ACPI enabled, you will need to manually enable the device even if you have correctly disabled "Quick Boot".

This only works with newer kernels that fully support pnpacpi, and provided that this patch has been applied (applied to Linus' tree in july 2005).

It seems that the default dma numbers change when pnpacpi is used (to dma1=1 dma2=3, for instance).

If you're using acpi and pnpacpi, you can see which resources the sound card is using like this:

# cat /sys/devices/pnp0/00:05/resources
# cat /sys/devices/pnp0/00:06/resources

Using ALSA

Compile the sound driver as a module and load it after everything else. You can add the following line to a boot script, ie. rc.local for that: 

/sbin/modprobe snd-cs4236 index=0 port=0x530 cport=0x538 irq=5 dma1=1 dma2=0 isapnp=0

This is reported to work at least with kernel 2.6.15.

On the 770x using kernel 2.6.16/2.6.17 you may try this: 

/sbin/modprobe snd-cs4232 port=0x530 cport=0x120 irq=5 dma1=1 dma2=0 isapnp=0

There is a nice script which can do all this for you, including activation of the device and detecting the correct resource settings to use.

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