On Wed, 20 Dec 2017 11:49:33 +0100 (CET)
Roger Price <debian@rogerprice.org> wrote:
Hi, I'm running stretch with Xfce. Gnome is also installed. The
login greeter appears correctly, and allows login, but if I leave the
"greeter" screen too long, then something intervenes and puts the two
monitors into a sleep mode (iiyama E1700S orange light). I cannot
find any key combination which wakes up gdm3.
I'd try simply replacing GDM with lightdm. Just a workaround, but the
oroginal problem might by very hard to solve.