HDMI screen not recognised after upgrade Gnome 3.20

[Thomas SIMON]

Thanks!
 
Sorry, I should have given some more details, I have a Lenovo Thinpad
Yoga 12, with Intel graphics 5500.
 
Thanks,
 
Thomas
 
 
On Thu, 2 Jun 2016, at 17:50, Josh Smith wrote:
> I upgraded to 3.20 and had some issues with the Nouveau drivers.
> Switched to proprietary Nvidia drivers and it worked much better. I'm
> using a DisplayPort3 however.
>
> On Thu, 2 Jun 2016 at 12:20 Usama Akkad <uahello at gmail.com> wrote:
>> 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
>>  >
>>
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