Looking more closely at the logs, this appeared in my syslog when the bug manifested itself yesterday for the first time in eight days:
May 28 13:56:27 greengage kernel: [683758.866789] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
Looking more closely at the logs, this appeared in my syslog when the bug manifested itself yesterday for the first time in eight days:
May 28 13:56:27 greengage kernel: [683758.866789] [drm:drm_ mode_getfb] *ERROR* invalid framebuffer id