SUMMARY KDE desktop is unreachable after some time idle STEPS TO REPRODUCE With the recent update to Plasma 6.4.x, I started seeing a new problem (not seen in 6.1.x): * Laptop is connected to external display via HDMI. * Laptop lid is closed. Plasma power settings adjusted to ignore lid switch. * Leave laptop unattended for some time (e.g. overnight) * Try to wake external display using external keyboard OBSERVED RESULT External display does not wake up. EXPECTED RESULT External display wakes up. Shows SDDM login prompt. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Kernel 6.12.35-1-lts KDE Plasma Version: 6.4.x KDE Frameworks Version: 6.15.0 Qt Version: 6.9.1 ADDITIONAL INFORMATION Laptop is reachable via ssh. Workaround is restarting SDDM via ssh. This recovers display & shows login screen okay. I looked inside the journal. First message on attempt to wake via keyboard shows a kwin error: * kwin\_wayland\[22936\]: kwin\_xwl: Could not find a matching X RandR CRTC/output to set as primary for KWin::DrmOutput(0x63655bdc06a0, name="eDP-1", geometry=QRect(0,0 1920x1080), scale=1) After this first entry, there's a larger list of failures. Here's the next few entries: Jul 09 13:53:38 seranto-009 kwin_wayland[22936]: kwin_xwl: Could not find a matching X RandR CRTC/output to set as primary for KWin::DrmOutput(0x63655bdc06a0, name="eDP-1", geometry=QRect(0,0 1920x1080), scale=1) Jul 09 13:53:38 seranto-009 kwin_wayland[22936]: kwin_scene_opengl: Could not delete render time query because no context is current Jul 09 13:53:39 seranto-009 kded6[23144]: xsettingsd: Reloading configuration Jul 09 13:53:39 seranto-009 kded6[23144]: xsettingsd: Loaded 16 settings from /home/james/.config/xsettingsd/xsettingsd.conf Jul 09 13:53:39 seranto-009 polkit-kde-authentication-agent-1[23163]: qt.qpa.wayland: There are no outputs - creating placeholder screen Jul 09 13:53:39 seranto-009 kactivitymanagerd[23155]: qt.qpa.wayland: There are no outputs - creating placeholder screen Jul 09 13:53:39 seranto-009 insync[23332]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash Jul 09 13:53:39 seranto-009 kdeconnectd[23262]: 2025-07-09T13:53:39 qt.qpa.wayland: There are no outputs - creating placeholder screen Jul 09 13:53:39 seranto-009 ksecretd[22885]: qt.qpa.wayland: There are no outputs - creating placeholder screen Jul 09 13:53:39 seranto-009 xdg-desktop-portal-kde[23165]: qt.qpa.wayland: There are no outputs - creating placeholder screen Jul 09 13:53:39 seranto-009 yakuake[23335]: qt.qpa.wayland: There are no outputs - creating placeholder screen Jul 09 13:53:39 seranto-009 konsole[23462]: qt.qpa.wayland: There are no outputs - creating placeholder screen Jul 09 13:53:39 seranto-009 kded6[23051]: qt.qpa.wayland: There are no outputs - creating placeholder screen Jul 09 13:53:39 seranto-009 systemsettings[23463]: qt.qpa.wayland: There are no outputs - creating placeholder screen
Further observation: Fault manifests when external HDMI display has been switched off for a while. Actual duration is unclear.
I have the same problem. I posted more info about it on the Forum from Arch Linux, as well what I already tried and some ideas: https://bbs.archlinux.org/viewtopic.php?pid=2268957 What is happening here: 1. The Laptop Awakes. 2. kwin (?) sends some handshake to HDMI (monitor in stand-by). 3. The monitor starts turning on. 4. HDMI handshake request times out from KWIN. 5. The monitor is ON but it has no signal. 6. Monitor turns off again. 7. Placeholder screen has blocked input access. (Need to open lid, press enter, close lid) 8. HDMI monitor is ON again and everything is good until the next suspend state. How it could be mitigated: 1. Increase the time-out to X seconds and try to reach the same monitor again or try to connect multiple times for X seconds. 2. Allow receiving input (keyboard, mouse) inside the placeholder screen itself. (If I could press enter, the monitor would wake up (like opening the lid) Some logs from the forum post: ``` Oct 22 14:34:35 theluga plasmashell[1178]: requesting unexisting screen available rect -1 Oct 22 14:34:35 theluga plasmashell[1178]: requesting unexisting screen available rect -1 Oct 22 14:34:35 theluga plasmashell[1178]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga kscreenlocker_greet[2644]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga org_kde_powerdevil[1200]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga kwin_wayland[1013]: Could not find a matching X RandR CRTC/output to set as primary for KWin::DrmOutput(0x648acddd91c0, name="HDMI-A-1", geometry=QRect(0,0 1920x108> Oct 22 14:34:35 theluga kwin_wayland[1013]: Could not find a matching X RandR CRTC/output to set as primary for KWin::DrmOutput(0x648acddd91c0, name="HDMI-A-1", geometry=QRect(0,0 1920x108> Oct 22 14:34:35 theluga yakuake[1368]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga xdg-desktop-portal-kde[1408]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga ksecretd[1415]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga kdeconnectd[1361]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga kactivitymanagerd[1194]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga polkit-kde-authentication-agent-1[1199]: There are no outputs - creating placeholder screen Oct 22 14:34:35 theluga kwin_wayland[1013]: Could not find a matching X RandR CRTC/output to set as primary for KWin::DrmOutput(0x648acddd91c0, name="HDMI-A-1", geometry=QRect(0,0 1920x108> ```
My problem was solved with the update of plasma-destop to 6.5.0-1.
Great news! How about you, James?
(In reply to Nate Graham from comment #4) > Great news! How about you, James? I'm running the upgrade today; will update y'all tomorrow.
My "overnight" test passed. Things are much improved. I'll keep an eye on things over the next few days.
BTW. Upgraded system info is: Operating System: EndeavourOS Kernel Version: 6.12.53-1-lts (64-bit) KDE Plasma Version: 6.5.0 KDE Frameworks Version: 6.19.0 Qt Version: 6.10.0 Graphics Platform: Wayland
I've been running daily for a few days now. Problem has not been seen again. Looks good.
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