Ubuntu 8.04.1 / ALSA / Problems with sound (crackling)

[jebulis]

I've installed Ubuntu 8.04.1 and ran all the fixes provided here https://help.ubuntu.com/community/AspireOne
Everything else is working as it should, but the sound output is still distorted. To put it in simple terms, you can either have

1. Sound with the PC-speaker "joining in" and distorting the output
2. No sound at all

If I disable or blacklist the PC-speaker, I get absolutely no sound. If try changing different channel volumes, it only affects the wave or "normal" sound output (provided by the ALC268 chip), but the distortion itself remains the same.

I've also tried the instructions provided here https://help.ubuntu.com/community/SoundTroubleshooting#head-083f68c150e8cc9de635a7ab89b8ccfc6100ecf8 but so far nothing has helped.

Any ideas?

Edit:
Tried installing 1.0.19 ALSA drivers, but the problem persists.

 

[einarth]

andrey found and posted the solution to the sound problem in a different thread.

The key is to edit /etc/modprobe.d/blacklist and add a line stating "blacklist snd_pcsp". Reboot, and the noise disappears. I believe that this is exactly disabling the PC speaker.

 

[binnary]

andrey found and posted the solution to the sound problem in a different thread.

The key is to edit /etc/modprobe.d/blacklist and add a line stating "blacklist snd_pcsp". Reboot, and the noise disappears. I believe that this is exactly disabling the PC speaker.

Yes it works! Now we have to find a solution for de SD card reader and for de storage expansión and we will have full ubuntu support for de Acer Aspire ONE!

Thanks for all folks!

 

[ptechno]

Hello,
Lets see, what Ive done is:
Rebuild ALSA, added a line for internal MIC ("options snd-hda-intel model=auto") and added this in blacklist ("blacklist snd_pcsp")
I hear well videos using headphones, but Im not sure if its working 100%, should it work perfectly fine after what ive done?
And... there's still no way for fixing everything?
Thanks ;-)

 

[2manydjs]

Sound after Suspend/Resume Workaround

Difficulty Level: Easy

The snd_hda_intel module does not reload properly after suspending the EeePC. While this isn't a perfect workaround,
WARNING: Some processes, such as the gnome-volume-manager do not like this workaround and will complain after resuming. Currently, there is no fix for this.
Create the file: /usr/lib/pm-utils/sleep.d/45sound

#!/bin/bash

if [ ! -x /sbin/alsa ]; then
        exit 0;
fi

case "$1" in
    hibernate|suspend)
        /sbin/alsa suspend
        ;;
    thaw|resume)
        /sbin/alsa resume
        ;;
    *)
        ;;
esac

exit $?

Set the execution bit this file. Run this command:
sudo chmod +x /usr/lib/pm-utils/sleep.d/45sound

A not so elegant hack to get audio working after suspend.

 

[jebulis]

andrey found and posted the solution to the sound problem in a different thread.

The key is to edit /etc/modprobe.d/blacklist and add a line stating "blacklist snd_pcsp". Reboot, and the noise disappears. I believe that this is exactly disabling the PC speaker.

If I do that, I lose all sound, internal speakers and headphones.

EDIT:

It seems to be all or nothing with this laptop, either I get no sound at all or I get the Realtek ALC268 supplied sound with the PC Speaker providing distortion. Even if I set the PC Speaker volume to zero, I then also lose all volume from the ALC268 Master channel.

Blacklisting snd_pcsp leads to the same result, I lose all sound. Is there a way to re-install the ALSA snd-hda-intel drivers without PC Speaker?