I tried an upstream kernel ( 4.4.12-040412-generic #201606011712 ). Attaching after suspend/resume no longer results in a crash.
The screen frequently fails to restore on the first try. dmesg has these lines in that case: [drm:intel_mst_disable_dp [i915]] *ERROR* failed to update payload -22 [drm] GPU HANG: ecode 8:-1:0x00000000, reason: Kicking stuck wait on blitter ring, action: continue [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun But, in an improvement from the Ubuntu kernel, I can unplug and try again with success. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1581560 Title: system crash when attaching external display To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1581560/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
