I recently installed a backported linux image: > linux-image-4.3.0-0.bpo.1-686-pae
with this the crashes do no occure Only things which occure are those FIFO underruns: > [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B > FIFO underrun they don't seem fatal. Regards.