HDMI screen not recognised after upgrade Gnome 3.20

[Usama Akkad]

Hello Thomas,

For me sometimes the screen connected to HDMI is not recognized till I
remove the cable and reinsert it after boot. Then I might need to press
the key to activate external screen on my laptop.

try "xrandr" command to get info about the recognized screens.

Best wishes,
Usama

On 02-06-2016 18:16, Thomas SIMON wrote:
> Hello all,
> 
> I'm not sure if this is the right mailing list or if I should ask for
> help somewhere else (I'm not sure it's a bug so far...). Basically, the
> problem is simple, after upgrade of Ubuntu GNOME 16.04 with staging PPA,
> my external screen was working (plugged in with HDMI), even after the
> first restart. I went away and then switched off entirely my laptop,
> when I came back, no way to get the external screen recognised by the
> system (doesn't show on "Display" of system settings and doesn't show
> with randr command). 
> 
> Then, well, I used ppa-purge, but that didn't change anything and tried
> to plug in the screen with a VGA cable (and USB adaptor) and that still
> wasn't recognised. Finally, I tested the screen with another laptop
> (running Win 10) and that got the screen to work, so I'm pretty sure
> it's an issue related to the upgrade to Gnome 3.20. 
> 
> Would anybody be able to advise please?
> 
> Thanks a lot in advance,
> 
> Thomas
>