cytek-jy

[cytek-jy]

I’ve sent the Ubuntu Wayland logs.

I believe that XFCE xrandr output was taken on an active session with screen blanking enabled.

To be sure I reran while disconnected and got this:

$ xrandr --verbose 
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 4096 x 4096
None-1 connected 3840x2160+0+0 (0x41) normal (normal left inverted right x axis y axis) 0mm x 0mm
	Identifier: 0x3f
	Timestamp:  30411
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       0
	CRTCs:      0
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 37 
		supported: 37
	non-desktop: 0 
		range: (0, 1)
  3840x2160 (0x41) 497.664MHz *current +preferred
        h: width  3840 start 3840 end 3840 total 3840 skew    0 clock 129.60KHz
        v: height 2160 start 2160 end 2160 total 2160           clock  60.00Hz

And reran while connected with nomachine with screen blanking enabled and got this:

$ xrandr --verbose 
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 4096 x 4096
None-1 connected 3840x2160+0+0 (0x41) normal (normal left inverted right x axis y axis) 0mm x 0mm
	Identifier: 0x3f
	Timestamp:  30411
	Subpixel:   unknown
	Gamma:      8.3e-08:8.3e-08:8.3e-08
	Brightness: 0.25
	Clones:    
	CRTC:       0
	CRTCs:      0
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 37 
		supported: 37
	non-desktop: 0 
		range: (0, 1)
  3840x2160 (0x41) 497.664MHz *current +preferred
        h: width  3840 start 3840 end 3840 total 3840 skew    0 clock 129.60KHz
        v: height 2160 start 2160 end 2160 total 2160           clock  60.00Hz

Hope this helps.

[cytek-jy]

Here is the output on the XFCE machine.

$ xrandr --verbose
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 4096 x 4096
None-1 connected 3840x2160+0+0 (0x41) normal (normal left inverted right x axis y axis) 0mm x 0mm
Identifier: 0x3f
Timestamp: 30411
Subpixel: unknown
Gamma: -9.2e-09:-9.2e-09:-9.2e-09
Brightness: 0.23
Clones:
CRTC: 0
CRTCs: 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
link-status: Good
supported: Good, Bad
CONNECTOR_ID: 37
supported: 37
non-desktop: 0
range: (0, 1)
3840x2160 (0x41) 497.664MHz *current +preferred
h: width 3840 start 3840 end 3840 total 3840 skew 0 clock 129.60KHz
v: height 2160 start 2160 end 2160 total 2160 clock 60.00Hz

I will share logs from the Ubuntu 24.04 wayland sessions tomorrow. Thanks!

[cytek-jy]

I have verified that the in !M tray item’s menus “Blank physical screen” is checked.

I was unable to upload the logs here so I have sent them in an email.

Given that I was able to replicate this on a fresh install of ubuntu (from ubuntu-24.04.3-desktop-amd64.iso) it may be that this problem is not specific to XFCE/LightDM.

Is there any other information I can provide? Thanks.

[cytek-jy]

I also tried to enable screen blanking on a fresh standard installation of Ubuntu 24.04 LTS and it also did not work, so I don’t think the problem is unique to XFCE / LightDM. This 24.04 LTS is using Gnome and Wayland.

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