My system has an atom N270 + intel i915 graphic card.

Under Windows I can enjoy 720p bigbuckbunny youtube video fullscreen without any trouble.

Under Ubuntu 12.04 I have laggy and choppy fullscreen video and choppy video when not fullscreen.

I've seen that under ubuntu the cpu is almost always at 100% use.

What I must do in order to have videos playing well under ubuntu ?

I've already tried the following :

Force flash gpu detection : (no result) :

• mkdir /etc/adobe
• echo "OverrideGPUValidation = 1" | sudo tee -a /etc/adobe/mms.cfg

grub options (had results but not enough) :

• i915_enable_rc6=1
• i915_enable_fbc=1
• i915_lvds_downclock=1
• pcie_aspm=force

updated intel drivers (glasen ppa)

Using chrome instead of firefox (had impact but not enough)