I am now trying the 64studio beta kernel. You can install it by installing a single package.
64studio RT-Kernel 32bit (headers)
64studio RT-Kernel 64bit (headers)
All Ubuntu functionality is working on my system (although I am not using any restricted drivers). Realtime performance is a definite improvement over the Jaunty RT-kernel.
I will report back with a stability report in about 48 hours.
Edit: There have been no crashes since upgrading to this kernel. Real time performance has significantly improved. There have been no feature regressions for my system (Samsung R41 Madea notebook)
Edit2: For some reason similar crashes have since returned, similarly frequent; however, now the computer can be restarted with ALT-PRNTSC-REISUB. I am now trying the following in addition to the new kernel.
This approach found on a post on the OSS Notebook blog.
sudo dpkg -i libgl1-mesa-dri_7.4-0ubuntu3_i386.deb libgl1-mesa-glx_7.4-0ubuntu3_i386.deb
Edit3: The combined approach of aforementioned packages and the new kernel seem to render a stable Jaunty System. Finally, if I may add this! I also locked the two packages in synaptic to avoid upgrades that don't contain the fix.
Edit4: Apparently, there is *still*, even after all this trouble, the occasional hard freeze. It's rare enough to have a better-than-nothing usable system, but I am really thinking about getting myself a laptop that is somehow "officially supported" or something.