https://bugs.kde.org/show_bug.cgi?id=517290

Sanfod Rockowitz <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #7 from Sanfod Rockowitz <[email protected]> ---
This may not be the only issue, but one thing of note in in the logs is 

[1304978] Emitting DDCA_EVENT_DDC_ENABLED, card1-HDMI-A-1, ddc working: false

Background:  It is possible that, when a new monitor is detected, DDC
communication is not immediately enabled.  In that case, libddcutil emits
DDC_EVENT_DDC_ENABLED with flag DDCA_EVENT_DDC_WORKING not set.  The display
watch recheck thread watches to see if DDC communication becomes enabled.  If
it does, a second DDCA_EVENT_DDC_ENABLED event is emitted, with flag
DDCA_DISPLAY_EVENT_DDC_WORKING set.  (Note that for displays, such as laptop
displays, that truly do not support DDC, event  DDCA_DISPLAY _EVENT_DDC_ENABLED
will never be emitted.)

Prior to ddcutil release 2.2.7, this algorithm was not working properly, and a
DDCA_EVENT_DDC_ENABLED event could be prematurely emitted with
DDCA_EVENT_DDC_WORKING not set, which is what the log reports.  This was fixed
in release 2.2.7. 

Suggest you retest with libddcutil from release 2.2.7 installed.

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