Bug 506003

Can you paste the output of `kscreen-doctor -o` and also mention which of the screens in the output is the one that experiences the issue?

```
% kscreen-doctor -o
Output: 1 DP-1 2e2f447a-1627-4080-8773-7f359c9d9818
        enabled
        connected
        priority 1
        DisplayPort
        replication source:0
        Modes:  1:3840x2160@60*!  2:3840x2160@30  3:2560x1440@60  4:1920x1200@60  5:1920x1080@60  6:1920x1080@60  7:1920x1080@60  8:1600x1200@60  9:1680x1050@60  10:1280x1024@60  11:1440x900@60  12:1280x800@60  13:1280x720@60  14:1280x720@60  15:1024x768@60  16:800x600@60  17:720x480@60  18:720x480@60  19:640x480@60  20:640x480@60  21:640x480@60  22:2560x1600@60  23:3200x1800@60  24:2880x1620@60  25:1600x900@60  26:1368x768@60 
        Geometry: 1280,0 2195x1235
        Scale: 1.75
        Rotation: 1
        Overscan: 0
        Vrr: Never
        RgbRange: Automatic
        HDR: disabled
        Wide Color Gamut: disabled
        ICC profile: none
        Color profile source: sRGB
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 80% and dimming to 100%
        DDC/CI: allowed
        Color resolution: automatic (10), range: [8; 16] bits per color
        Allow EDR: unsupported
Output: 2 DP-2 0337c83a-8942-4c76-8b26-cdfa90720bb5
        enabled
        connected
        priority 3
        DisplayPort
        replication source:0
        Modes:  27:1280x1024@60*!  28:1280x800@60  29:1280x720@60  30:1024x768@60  31:800x600@60  32:640x480@60  33:720x400@70 
        Geometry: 0,105 1280x1024
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: incapable
        RgbRange: Automatic
        HDR: incapable
        Wide Color Gamut: incapable
        ICC profile: none
        Color profile source: sRGB
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 100% and dimming to 100%
        DDC/CI: allowed
        Color resolution: automatic (10), range: [8; 16] bits per color
        Allow EDR: unsupported
Output: 3 HDMI-A-1 437ca33b-c469-4b0d-ba19-2fff9d237614
        enabled
        connected
        priority 2
        HDMI
        replication source:0
        Modes:  34:1920x1080@60*!  35:1920x1080@60  36:1920x1080@60  37:1920x1080@50  38:1680x1050@60  39:1280x1024@75  40:1280x1024@60  41:1440x900@75  42:1440x900@60  43:1280x800@60  44:1280x720@60  45:1280x720@60  46:1280x720@60  47:1280x720@50  48:1024x768@75  49:1024x768@60  50:800x600@75  51:800x600@60  52:720x576@50  53:720x576@50  54:720x576@50  55:720x480@60  56:720x480@60  57:720x480@60  58:720x480@60  59:720x480@60  60:640x480@75  61:640x480@73  62:640x480@67  63:640x480@60  64:640x480@60  65:640x480@60  66:720x400@70  67:1600x900@60  68:1368x768@60 
        Geometry: 3475,77 1920x1080
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: incapable
        RgbRange: Automatic
        HDR: incapable
        Wide Color Gamut: incapable
        ICC profile: none
        Color profile source: sRGB
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 100% and dimming to 100%
        DDC/CI: allowed
        Color resolution: automatic (10), range: [8; 16] bits per color
        Allow EDR: unsupported
```

The screen that stays on is the last one, HDMI-A-1

Thanks!

Please attach the output of
> kscreen-doctor --dpms show
while the screen is supposed to be off.

> sleep 40; kscreen-doctor --dpms show
with a configured display timeout of 30s should do the trick

The output of drm_info while it's on, and while it's supposed to be off might also be useful

Here's the output with a delay set to 30 seconds:

> % sleep 40; kscreen-doctor --dpms show
> dpms mode for screen DP-2: off
> dpms mode for screen DP-1: off
> dpms mode for screen HDMI-A-1: off

Here's the output while the session is locked, with the delay set to 20 seconds:

> % sleep 40; kscreen-doctor --dpms show
> dpms mode for screen DP-2: off
> dpms mode for screen DP-1: off
> dpms mode for screen HDMI-A-1: on

Oddly enough, now the one problematic screen appears to turn off, but then turn back on.

I'll attach the drm_info outputs as files as they're really long

Created attachment 182735 [details]
drm_info when every screen is on

Created attachment 182736 [details]
drm_info when the screens are supposed to be off but one isn't

> sleep 40; drm_info > drm_info-supposed_to_be_off.txt

Created attachment 182737 [details]
drm_info when the screens are supposed to be off but one isn't (screen locked version)

> sleep 40; drm_info > drm_info-supposed_to_be_off_locked.txt

Alright, that at least rules out a driver bug - if KWin knows the output isn't off, then either powerdevil isn't asking the output to be turned off, or KWin fails to do it somehow.

(In reply to Reboot from comment #5)
> Oddly enough, now the one problematic screen appears to turn off, but then
> turn back on.
That might be fixed with https://invent.kde.org/plasma/kwin/-/merge_requests/7868 then. If you could test the MR (or the patch applied on top of 6.4), that would be great, if not, we can wait for 6.4.3.

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Pleased to report I can no longer reproduce this issue on 6.4.3 :)