After recent update of Ubuntu the problem seems to be solved.
2.6.22-9-generic (package version 2.6.22-9.25)
alsa-base 1.0.14 (package version 1.0.14.1ubuntu1)
File ' /etc/modprobe.d/alsa-base' contains the following line:
options snd-hda-intel model=lenovo
How it's working now:
* Muting 'front' channel mutes the speakers
* Changing 'front' level (volume) with volume weel un-mutes the speakers
* Plugging headphones into the front jack mutes the speakers
* Unplugging the headphones un-mutes the speakers
* Checking 'headphones' mixer option actually gives sound to the front jack
Update on Toshiba satellite P205:
After recent update of Ubuntu the problem seems to be solved.
2.6.22-9-generic (package version 2.6.22-9.25)
alsa-base 1.0.14 (package version 1.0.14.1ubuntu1)
File ' /etc/modprobe. d/alsa- base' contains the following line:
options snd-hda-intel model=lenovo
How it's working now:
* Muting 'front' channel mutes the speakers
* Changing 'front' level (volume) with volume weel un-mutes the speakers
* Plugging headphones into the front jack mutes the speakers
* Unplugging the headphones un-mutes the speakers
* Checking 'headphones' mixer option actually gives sound to the front jack
Mic, front mic, mic boosts also work as intended.