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On 01/09/17 07:11, Richard Brown wrote: > Hi > > Linux rich-desktop 4.10.0-33-generic #37-Ubuntu SMP Fri Aug 11 10:55:28 > UTC 2017 x86_64 x86_64 x86_64 GNU/Linux Can we just clarify a sec exactly what you mean by "monitor not working on HDMI"? Do you mean it's completely non-responding, or does the BIOS/EFI display during boot, text mode boot messages show up and only X doesn't work? Does the system boot at all when the monitor is on HDMI? Presumably it's just sat there waiting for input (this is what you need SSHD running for to find out) but is actually operational. Can you access the other VTTYs by hitting CTRL+ALT+Fx? With the HDMI connected monitor non-responsive, after booting the machine try hitting CTRL+ALT+F4 a couple of times - it *should* drop you to a text mode login prompt (but probably won't thanks to the way Ubuntu/systemd have messed with stuff over the years). I'm loathe to give you more advice without knowing a bit (actually, quite a lot) about what's going on here. That being said, it certainly won't hurt also installing a slightly newer patched Mesa and friends. A 4.12 kernel would also be a good idea but thanks to Ubuntu being Ubuntu they as usual haven't bothered releasing a trivially installable mainline version yet. Kabylake and newer silicon is still a bit sketchy in terms of support I'm afraid (in all OS's, including Windows), although you really shouldn't be having this many issues just getting a basic HDMI display up and running out of the box. Install newer driver stack: sudo add-apt-repository ppa:oibaf/graphics-drivers sudo apt-get update sudo reboot Cheers -- The Mailing List for the Devon & Cornwall LUG https://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq