Thanks! Indeed I updated to the latest BIOS version (no change). As you can see (with my still identical hardware) the bug persists in ubuntu 16.04.1 and kernel 4.4 (4.4.0-57.58 to be exact). I also just tested the latest mainline kernel release 4.9 (4.9.0-040900-generic) which did not fix it!
Thanks! Indeed I updated to the latest BIOS version (no change). As you can see (with my still identical hardware) the bug persists in ubuntu 16.04.1 and kernel 4.4 (4.4.0-57.58 to be exact). I also just tested the latest mainline kernel release 4.9 (4.9.0- 040900- generic) which did not fix it!