If you disable VDPAU entirely, by turning off hardware decoding and switching the video output module to XCB, does zoom work? You can't test hardware zooming without the libvdpau-va-gl1 package installed and either Automatic or VDPAU selected as the decoder and output module.
If you disable VDPAU entirely, by turning off hardware decoding and switching the video output module to XCB, does zoom work? You can't test hardware zooming without the libvdpau-va-gl1 package installed and either Automatic or VDPAU selected as the decoder and output module.