https://bugs.kde.org/show_bug.cgi?id=517490

random.dude <[email protected]> changed:

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--- Comment #20 from random.dude <[email protected]> ---
Still reproducible on Fedora 44 with plasma-login-manager 6.7.2 (AMD iGPU,
monitor on HDMI). 
Booting with the monitor powered off, then turning it on: the greeter shows the
password field and power buttons, but Enter does nothing and the buttons are
unresponsive.

Working workaround: force the connector as always-connected with the monitor's
EDID, so the greeter never starts headless. 
Copy /sys/class/drm/<card-connector>/edid to
/usr/lib/firmware/edid/monitor-edid.bin, include it in the initramfs, and add
kernel args drm.edid_firmware=HDMI-A-1:edid/monitor-edid.bin video=HDMI-A-1:e. 
With this the greeter works normally even when booting with the display off.

The workaround suggests that the issue is related to the greeter starting
without any active display and not correctly handling a later DRM hotplug
event. When the HDMI connector is forced to be present from boot using
drm.edid_firmware and video=HDMI-A-1:e, the greeter behaves normally even if
the monitor is powered on only afterwards. This may indicate that the issue
lies in Plasma Login Manager's handling of displays that appear after the
greeter has already started.

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