[kde] [Bug 431494] Being able to set a higher resolution than your monitor has

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=431494

--- Comment #3 from 2wxsy58236r3 at opayq.com ---
You can refer to [1] for adding a custom resolution with xrandr.

> I know that that works,I tested it on a per game basis with Gamescope
> and it worked flawlessly.
When you are playing the game, check your monitor's on-screen display (or
monitor's settings panel) to find out the resolution and refresh rate of the
input signal.

> Try to watch a 2160p video to see if that makes any difference.
Actually, if your resolution is not the same as the video's resolution, the
media player will scale the video for you:

Example of upscaling: 480p video on 1080p monitor 
Example of downscaling: 4K video on 1080p monitor

Some media players such as mpv [2] allow you to configure the scaling
algorithms. Some algorithms will sharpen the video but require a powerful GPU.

Suppose your monitor does accept an input signal higher than its native
resolution, then the scaling will be done by the monitor, which is not ideal
since you cannot control how the monitor downscales the input signal.

In addition, suppose you have forced 4K but your monitor's native resolution is
1080p, then when you play a 1080p video, it will first be upscaled to 4K by
software, then downscaled back to 1080p by your monitor. This will result in
quality loss, and it wastes GPU computational power.



[1] https://wiki.archlinux.org/index.php/Xrandr#Adding_undetected_resolutions
[2] https://github.com/mpv-player/mpv

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