I use a Intel i7 Dell-laptop. I installed Ubuntu 12.04(64bit) from scratch. I realized the CPU temperature increased immediately(it's not difficult to detect temperature with this computer only by hand) . When I played flash players in youtube or elsewhere I saw in the system manager that only one core increased working frequency despite all other. And that core was like 80-90% while the others stayed at 5%. Any suggestions? Should I install 32bit version of Ubuntu?
I've been reading about a lot of issues with CPU overheating in Ubuntu, particularly with Sandybridge processors, with the blame being placed on all sorts from flash to internet explorer(?!). From my own research and experimenting with different distros, it seems the issue is with the linux kernel. 12.04 was supposed to solve these issues, but the 3.2 kernel in this distro still doesn't seem to play well with sandybrige; I'm using 12.04 with a quad core i7, and while my overheating issues are not as extreme as some I've read about, it does non-the-less overheat, and harnesses nowhere near the full power of my processor. Kernel 3.4 was supposed to bring, amongst other things, improved sandybridge performance; I've installed the Ubuntu specific 3.4 kernel, and there is some improvement, but put into the context of what my processor is capable of (and fully achieves in Win7) it's still just not good enough. Such a shame, I love Linux, and Ubuntu, but if it can't harness new tech, what's the point?
Flash is very poorly optimized to work on Linux, it probably will work kinda funky in whatever installation you might have.
So I would recommend switching to HTML5 version of Youtube: http://www.youtube.com/html5
Also installing the CPU Frequency widget: https://launchpad.net/indicator-cpufreq