SOUND!!! Yes it is now possible to get the ALC268 hda-intel audio chipset working along with the headphone jack. It has taken a few hours trying to hack a solution together from notes relating to other distros but I finally have something acceptable. I guess you want to know how to do it, instructions now follow.
I am using the gentoo-sources kernel 2.6.23-gentoo-r4 without alsa compiled in. Alsa will be compiled as a module. I am using the latest Alsa drivers 1.0.15. You may need to unmask and emerge the packages listed below.
This guide should provide the information to get Alsa setup http://www.gentoo.org/doc/en/alsa-guide.xml. Once Alsa is setup and the above packages installed run alsaconf (if not done so already) to setup alsa.
At this point I got some sound from the speakers and the 1.0.15 drivers gave me slightly different mixer options over the 1.0.14 drivers.The key to getting everything working is adding the following line to /etc/modprobe.conf
options snd-hda-intel model=toshiba
Reboot or restart alsasound to get the sound working. The headphone jack should mute the speakers when headphones are plugged in and unmute when they are removed. The sound from the speakers is also noticeably louder and richer and the integrated sub is generating the lower frequencies. I have not tried the other i/o jacks on the front of the notebook so I cannot say for sure if they are operational.