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Re: Buster/XFCE unlock screen is blank

Hi Russ,

On Fri, May 31, 2019 at 06:32:52PM -0700, Russ Allbery wrote:
> (This probably belonged on debian-user, but since I have background on
> this specific problem and already did the research.)

While this seems to be a problem for debian-user its very sensible that
the issue was raised here as well.  I stumbled upon this issue on two
laptops and I consider this a serious issue for the Buster release that.
Users ending up with a black screen in a not so uncommon setup is
something we need to avoid.  I intended to write a bug report about this
> Raj Kiran Grandhi <grajkiran@xxxxxxxxx> writes:
> > In a fresh install of Buster with XFCE desktop, locking the screen
> > blanks the monitor and the monitor enters a power save state. After
> > that, neither moving the mouse nor typing on the keyboard would turn
> > the monitor back on.
> Ctrl-Alt-F7 will also restore the desktop (which I think is just another
> version of your solution 2 of switching VTs).
> This appears to be a bug in light-locker specifically, which is the
> default screen lock program with XFCE with lightdm.  See, for instance:
> https://github.com/the-cavalry/light-locker/issues/114
> Switching to another greeter from the default gtk-greeter appears to help
> according to that bug, which may mean that the bug is actually in
> lightdm-gtk-greeter.  There doesn't appear to be a Debian bug for this; it
> might be a good idea to open one against light-locker (or, if you confirm
> switching to slick-greeter per that bug, lightdm-gtk-greeter).

Yes, please file the bug (and may be report the bug number here).  We
should not release with a broken greeter as default since we can not
assume that normal users will find out the "switch VT trick" and instead
will assume the box is frozen. 

Kind regards