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alldayidream

Member

Registered: 2022-02-14

Posts: 4

[SOLVED] Monitor no signal after suspend

After a recent system update my monitor no longer finds a signal after suspend. It was working as expected previously.

I'm using dwm and slock, running on an AMD GPU with a service for before and after.

Before=sleep.target calls

Environment=DISPLAY=:0
ExecStartPre=/usr/bin/xset dpms force off
ExecStart=/usr/bin/slock

After=sleep.target calls

Environment=DISPLAY=:0
ExecStartPre=/usr/bin/xset dpms force on
ExecStart=/usr/bin/xreset

/usr/bin/xreset bash script

xrandr --output HDMI-1 --mode 2560x1440 --rate 74.60

After resuming from suspend the After=sleep.target calls service is called (I checked with a debug line in /usr/bin/xreset) to log the output of xset q:

DPMS is Enabled
  Monitor is On

The only workaround I have is to switch to another tty and that wakes the monitor, or by restarting dwm

I've tried searching for a solution, would appreciate any help. Thanks

Last edited by alldayidream (2022-10-17 14:59:44)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 77,205

Re: [SOLVED] Monitor no signal after suspend

What's the output of "xrandr --display :0 -q" when the output lost the signal?
(You can "xrandr --display :0 -q | curl -F 'file=@-' 0x0.st" to feed it into a pastebin service from the console)

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alldayidream

Member

Registered: 2022-02-14

Posts: 4

Re: [SOLVED] Monitor no signal after suspend

Same output for both before suspend, and after suspend and no signal

Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
DP-1 disconnected primary (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     59.95 +  74.60*   72.04    60.00    50.00

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 77,205

Re: [SOLVED] Monitor no signal after suspend

What does it look like if you don't run the xreset script?
Why do you run it itfp?
And what if you make it

xrandr --output HDMI-1 --off
sleep 3
xrandr --output HDMI-1 --mode 2560x1440 --rate 74.60

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alldayidream

Member

Registered: 2022-02-14

Posts: 4

Re: [SOLVED] Monitor no signal after suspend

What does it look like if you don't run the xreset script?

The same output as post #3

Why do you run it itfp?

Before the system update a couple of days ago, everything was working as expected, after suspend slock would be open/visible, the newly added After=sleep.target service is a hack to fix the current issue

The suggested solution of adding

xrandr --output HDMI-1 --off

has fixed the problem

Thanks again for your help

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 77,205

Re: [SOLVED] Monitor no signal after suspend

Ftr, the cause is probably that the output unregisters (hence the workaround requirement) and the HDMI handshake fails (because HDCP was made to annoy us) and needs an extra invitation.

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