I don't know how, but I managed to turn on hardware rendering on flash. I have:

EnableLinuxHWVideoDecode=1
OverrideGPUValidation=1

in /etc/adobe/mmc.cfg

It doesn't matter if I turn EnableLinuxHWVideoDecode=0 or right click on flash and uncheck acceleration, it always hardware render it and play very poor full screen. Windowed mode is OK with low cpu usage. What might be goig on here? Did I miss anything? I installed all mesa related package like video-intel-mesa. My graphic is just a generic intel HD 4000

Thank you in advance

Tata.