try trancoding many videos at the same time or wait over 30 minutes, sometimes it freezes immediately and sometimes happen after 10-20 minutes. At the moment it freeze immediately and dmesg -w doesnt put anything out after that and the blinking cursor at the end stops blinking. I tried with the intel-gpu-top, with the i915.conf file and with intel gvt-g, not at the same time, one after one, but nothing works... thanks for help.