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Buster/XFCE unlock screen is blank




Hi,

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.
I could find two ways to get the display back on:

1. Typing the password without any visual feedback (while the monitor
continues to be in the power save state) unlocks the screen and the user
session is displayed normally.

2. Switching to another VT, say vt1 or vt2 turns the monitor back on
and on switching
back to the vt of the original session the unlock prompt is displayed
normally and the screen can be unlocked.

For a single user system, this is not a big deal, but is an important
issue if multiple users are logged in simultaneously.

I am not sure to which package this bug belongs to.
The closest I could find online was this:
https://bbs.archlinux.org/viewtopic.php?id=240200 wherein installing
the nouveau video driver appeared to have fixed the issue. However,
that solution is not applicable in my case as I have an integrated
intel graphics controller.

I had discovered this behaviour after a dist-upgrade to buster from
the current stable. I then made a clean install onto a spare hdd using
debian-buster-DI-rc1-amd64-netinst.iso and choosing the XFCE desktop
and am able to reproduce this bug.
Asking around on debian-user, I found a couple of other users who have
also experienced this same issue.

I shall be happy to assist the developers in troubleshooting this
issue. Please let me know if any other info is needed. I am running on
Intel i5-4440 CPU with its integrated graphics controller.

Thank you,
Raj Kiran