Hello
I have been struggling with the problems indicated in #870641 for some
time in relation to desktop machines - after locking the screen refuses
to wake up again. I believe I have discovered the solution, through
chance as much as anything else, and I expect it will also work with the
laptops.
I'm running :
Dell Optiplex 7040 with Intel HD 530 onboard graphics
Debian 10
kernel 4.19.0-12-amd64
xfce4 4.12.5
Xorg 1:7.7+19
Asus PA328 4k monitor
My particular problem was when the screen locked I couldn't wake it up
again. Some tricks worked, like typing in the dark sometimes woke it up,
or ctrl-alt-F1/F7/F8 etc etc but nothing actually solved the issue.
Explanation and solution
What appears to be happening is that when you install Debian 10 it
automatically installs a set of driver packages including
/xserver-xorg-video-intel/ (presumably if you have Intel graphics) In
the package description it reads (and I'm translating from French so
your version may be slightly different) :
"/Use of this driver is *not* recommended if the version of your
hardware is recent (from about *2007*). It is possible to uninstall this
driver and let the server use its own integrated modesetting driver/".
My hardware is definitely more recent than 2007 so I uninstalled this
package, rebooted and now everything is working as expected. It would
seem this driver should not be installed automatically anymore.
NB When waking up from being locked I noticed it takes about 6 seconds
for the greeter to show on the screen - so be patient. It is also
possible to arrive at the situation where you have to enter your
password twice, once for LIghtLocker and once for xscreensaver, but at
least that's logical, if not a little annoying.
Regards
Anthony
