Bug#908329: lightdm: LightDM shuts down the screen on lock and won't turn it on

[Rafał Olejnik <ja@pakos.biz>]

On Mon, 28 Jan 2019 08:44:29 +0100 Olivier Berger 
<olivier.berger@telecom-sudparis.eu> wrote:
> On Sat, Dec 08, 2018 at 09:41:03PM +0100, Mikhail Morfikov wrote:
> >
> > I think I have a similar (or the same) issue.
> >
> > Basically, when I lock the screen (via light-locker), the screen 
goes black,
> > but it doesn't turn off. Keystrokes and mouse seem to dead because 
they don't
> > turn the screen on. When I press ctrl+alt+F7, then I get the 
message: "This
> > session is locked, you'll be redirected to the login dialog in a 
few sec", and
> > after a few seconds I get the login screen. I don't even have to 
wait for the
> > redirect -- I can simply press ctrl+al+F7 and ctrl+alt+F8 (I have 
to press both
> > of them). One curious thing -- when I start typing while the screen 
is black,
> > the login form can be filled with password, and after pressing 
enter I can log
> > in.
> >
>
> Happens the same here, with XFCE, lighdm and light-locker and an Intel
> Corporation HD Graphics 620 card.
>
> Hope this helps.
>
> Best regards,
> --
> Olivier BERGER
> https://www-public.imtbs-tsp.eu/~berger_o/ - OpenPGP 
2048R/0xF9EAE3A65819D7E8
> Ingenieur Recherche - Dept INF
> Institut Mines-Telecom, Telecom SudParis, Evry (France)
>
>

>


Confirm, i'm having this issue on two systems with xfce 4.12.5, lightdm 
1.26.0-3, ligt-locker 1.8.0-3 and two different intel cards:

00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core 
Processor Integrated Graphics Controller (rev 06)
        Subsystem: Lenovo 4th Gen Core Processor Integrated Graphics 
Controller
        Kernel driver in use: i915
        Kernel modules: i915

00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 
(rev 07)
        Subsystem: Dell UHD Graphics 620
        Kernel driver in use: i915
        Kernel modules: i915

So far couldn't find any solution but have seen more ppl complaining.

--
Regards,
Rafał Olejnik