https://bugs.kde.org/show_bug.cgi?id=496631

--- Comment #8 from Evert Vorster <evors...@protonmail.com> ---
Hi there!

Doing some more testing on this issue. 
This issue is not apparent when running this monitor as an external monitor on
Windows 11. 
Monitor is configured as 4K@120Hz. Windows enters power save mode and monitors
turns off normally. Then, on a wake up event the monitor wakes up normally, and
resumes 4K@120Hz. 

In Linux, when the monitor is configured as 4K@120Hz, when the computer goes
into powersave mode and turns the monitors off, this monitor turns off as well.
On wakeup, this monitor wakes up, but the desktop does not extend to it. Then,
the monitor turns enters power save again, which triggers the desktop to extend
to it, which wakes up the monitor, but it claims that it is not receiving a
signal. After a while it switches over to standby mode again. 

At 4K@30Hz, the monitor wakes up normally from standby mode. 

At 4K@60Hz, the monitor exhibits the same issues as with 120Hz.

>From this I can conclude that it is not my hardware. 
Also, it works normally with a refresh rate of 30Hz. 

The BenQ monitor does take a little longer to wake up from power saving that
what I am used to with other monitors, especially when running higher refresh
rates. 
Is there some hardcoded timeout that KDE has to check to see if the monitor has
woken up properly from standby? If so, can this be increased for higher refresh
rates than 30?

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