Hello. Have you ever seen the errors below inside the log of the ARM Chromebook model XE303C12 ? [ 2416.631903] vidioc_try_fmt:379: Unsupported format for destination. [ 2416.631937] vidioc_try_fmt:379: Unsupported format for destination. [ 2437.287065] vidioc_g_selection:764: Can not get compose information [ 2437.294194] vidioc_g_fmt:347: Format could not be read [ 2437.300364] vidioc_g_selection:764: Can not get compose information [ 2437.301979] vidioc_g_fmt:347: Format could not be read [ 2441.711496] vidioc_g_selection:764: Can not get compose information [ 2441.713115] vidioc_g_fmt:347: Format could not be read [ 2455.174443] vidioc_g_selection:764: Can not get compose information [ 2455.175663] vidioc_g_fmt:347: Format could not be read I'm not sure but they could be correlated with the warnings I get when I try to watch an mp4 file using SMPlayer : libEGL warning : egl failed to create dri2 screen libEGL warning : failed to get driver name for fd -1 libEGL warning : MESA-LOADER : failed to retrieve device informations I'm looking for the technical reason why,when I play an mp4 video with VLC or SMplayer (and for sure other multimedia players),the video proceeds in spurts. Thanks. -- Mario.