I've the same issue on my "HP EliteBook 840 G1" when I dock my laptop to my "HP 2013 UltraSlim-Dockingstation" I get the following error in "/var/log/syslog":
... May 4 19:20:18 hp-elitebook-840-g1--s0-v2 kernel: [ 64.811603] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery reached max voltage May 4 19:20:18 hp-elitebook-840-g1--s0-v2 kernel: [ 64.811619] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed May 4 19:20:18 hp-elitebook-840-g1--s0-v2 kernel: [ 65.062599] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery reached max voltage May 4 19:20:18 hp-elitebook-840-g1--s0-v2 kernel: [ 65.062614] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed ... I think this bug is related to: https://bugs.freedesktop.org/show_bug.cgi?id=76490 And I think the kernel fix is available: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0e5585dc870af947fab2af96a88c2d8b4270247c The question is when will this kernel be available in 16.04? ** Bug watch added: freedesktop.org Bugzilla #76490 https://bugs.freedesktop.org/show_bug.cgi?id=76490 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1573648 Title: 16.04 -> AMD APU via VGA gives blank screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1573648/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
