Monitor won't wake from sleep after recent updates

[justfine]

Manjaro newb here.
After recent updates via pamac (linux66 6.6.80-1) my display (HDMI) refuses to wake up after going to sleep. I move the mouse to try to get display login screen and all I get is the display backlight briefly then message about no signal and going back to power saving mode. This is a new build which has been working fine for about 8 months with somewhat regular updates–every month or so.

At first I thought this was a lightdm issues but, looking through various logs beneath /var/log, checking journalctl -xe, and systemctl status of lightdm.service it looks like everything is running as expected.

I can get the display back if I switch over to console (ctrl-alt-f2), then do
restart of lightdm.service. This is why I thought it was lightdm at first.

More recently I discovered I can actually log in while the screen is blank. Some errant key presses started song playing. Just the display stays blank.

Only thing I can think of that things might have gone wrong prior to updates was I foolishly hit the “ignore” button in pamac to see what it did. Then realized there was no way to reverse that?!?!
I looked all over to see where the packages shown as ignored were persisted but, after exiting pamac and starting again the ignored packages were no longer listed so I assumed they were just being ignored only while pamac was running.

I keep seeing references to pacdiff to look for potential package problems but, I don’t have that command and can’t seem to find which package provides it.

Hoping somebody can point me in further troubleshooting steps.
Cheers.

[stephane]

see this

Xfce 4.20 screensaver and locking

I disabled screensaver and lock screen in settings completely. However after 5 min. the screen is turning black. Is this a bug in xfce 4.20 ? It’s rather annoying when you’re watching a show so there’s no mouse or keyboard action. Anyone experiencing the same and perhaps already know a solution ? These services are masked with commands sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target /etc/systemd/sleep.conf has these entries [Sleep] AllowSuspend=no …

[justfine]

Hi Stephane. Thanks for the reply!

I did see that thread and just re-read it. The only take-away I’m trying now is to disable display power management to see if the problem is related to that.

Kinda hope not since I would like my monitor to go to sleep at some point. This box uses enough power just sitting there.

$ xfce4-about --version | head -1; ps -ef | grep -E 'screen|locker' | grep -v grep
xfce4-about 4.20.0 (Xfce 4.20)
MYUSER         3468    3294  0 09:10 ?        00:00:00 xfce4-screensaver

[justfine]

So, in Power Manager >> Display tab >> Turning off “Display power management”

fixes the display not waking from sleep issue.
Of course, now monitor never sleeps. It just goes to blank screen with backlight still active. An improvement but, not where I want to be.

So underlying issue seems related to a power manager change or something the power manager calls to wake the monitor.