https://bugs.kde.org/show_bug.cgi?id=482713

--- Comment #9 from Jakob Petsovits <jpe...@petsovits.com> ---
(In reply to zvova7890 from comment #6)
> I don't think it is my case, but with 6.1 I have issues when the monitor
> goes to sleep (DPMS). Probably, when it wakes up, Powerdevil tries to work
> with HDMI/DP i2c too early, and the monitor sometimes isn't yet ready to
> respond.

Thanks for running this experiment. Might be related to Bug 476540, which is
also seemingly related to DPMS. (My theory is that we should disable any
brightness commands while DPMS has the monitor turned off, and then apply the
last requested brightness after the monitor comes back.)

Could you check what the value of `status` is when ddca_open_display2() fails?
ddcutil_status_codes.h doesn't have a "wait and try again" status code like
EAGAIN, but I wonder if perhaps DDCRC_DPMS_ASLEEP (value -3030) serves a
similar purpose in this case.

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