[Bug 201795] [Regression] Wrong 4k resolution detected with DisplayPort to HDMI adapter on amdgpu

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201795

--- Comment #18 from Nicholas Kazlauskas (nicholas.kazlauskas at amd.com) ---
It's intended driver behavior, not a regression.

The driver performs no display scaling by default since it forces the timing
for the preferred mode of the display. This means that refresh rate would
effectively be ignored - forcing the user to manually set "scaling mode" to
"off" in order to use a refresh rate different from the preferred mode. It's
certainly not very intuitive default behavior.

There's also good reason to favor using the preferred mode by default for
driver scaling - it's the most likely to not be affected by any sort of display
side scaling.

The "scaling mode" option isn't a workaround to a problem, but a feature you
can use and configure for when you want a different scaling mode than what the
monitor offers.

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