I have trimmed lspci output, but actually it was important. I have not only Intel GPU but also Nvidia GPU.
A year ago I have written ugly hack to disable Nvidia GPU year ago for power saving. I am sure that is too ugly to commit to repository and I am not programming professional so I need a lot of time to write even ugly and tiny patch. Actually DRI2 works if I recompile the kernel with my patch. Following is printed by mpv with working graphics acceleration: $ EGL_LOG_LEVEL=debug LIBGL_DEBUG=verbose MESA_DEBUG=1 mpv movie.avi Playing: movie.avi (+) Video --vid=1 (mpeg4) (+) Audio --aid=1 (ac3) (+) Subs --sid=1 'movie.srt' (subrip) (external) libGL: OpenDriver: trying /usr/X11R6/lib/modules/dri/i965_dri.so libGL: Using DRI2 for screen 0 libEGL debug: Native platform type: x11 (autodetected) libEGL debug: added egl_dri2 to module array libEGL debug: DRI2: dlopen(/usr/X11R6/lib/modules/dri/i965_dri.so) libEGL debug: found extension `DRI_Core' libEGL info: found extension DRI_Core version 1 libEGL debug: found extension `DRI_IMAGE_DRIVER' libEGL debug: found extension `DRI_DRI2' libEGL info: found extension DRI_DRI2 version 4 libEGL debug: found extension `DRI_DriverVtable' libEGL debug: found extension `DRI_ConfigOptions' libEGL debug: found extension `DRI_TexBuffer' libEGL info: found extension DRI_TexBuffer version 3 libEGL debug: found extension `DRI2_Fence' libEGL debug: found extension `DRI2_Flush' libEGL info: found extension DRI2_Flush version 4 libEGL debug: found extension `DRI_IMAGE' libEGL info: found extension DRI_IMAGE version 11 libEGL debug: found extension `DRI_RENDERER_QUERY' libEGL debug: found extension `DRI_CONFIG_QUERY' libEGL debug: found extension `DRI_Robustness' libEGL info: Using DRI2 libEGL debug: the best driver is DRI2 [ffmpeg/audio] ac3: Channel layout '5.1(side)' with 6 channels does not match specified number of channels 2: ignoring specified channel layout AO: [sdl] 48000Hz stereo 2ch s32 VO: [opengl] 720x304 yuv420p AV: 00:29:00 / 02:14:49 (21%) A-V: 0.000 Cache: 0s+1MB [ffmpeg/audio] ac3: frame sync error Error decoding audio. AV: 00:41:39 / 02:14:49 (30%) A-V: 0.000 Cache: 0s+8MB [ffmpeg/audio] ac3: frame sync error Error decoding audio. AV: 00:41:42 / 02:14:49 (30%) A-V: 0.000 Cache: 9s+8MB Exiting... (Quit) pthread_mutex_destroy on mutex with waiters! libEGL debug: Display 0x1728778c8800 is destroyed with resources
