[Bug 1902436] Re: Mouse slow in Xorg fractional scaling

2022-06-29 Thread Daniel van Vugt
> fractional scaling does not render the desktop at a higher resolution
than your screen

Xorg fractional scaling DOES render the desktop internally at higher
resolution than the monitor, and then downscales it to the physical
monitor. That's how you get a "fraction". For example:

  Monitor = 3840x2160
  Scale = 150%
  Render resolution = 5120x2880
  Transform matrix scale factor = 1.333
  Final visible resolution = 5120x2800 / 1.333 = 3840x2160

You can confirm this by looking at the details in 'xrandr --verbose'.

> If one could simply choose different integer scaling for different
monitors that would solve 90% of people's problems.

Yes you can already but only in Wayland sessions. Xorg sessions are
limited by Xorg itself not treating each monitor as a separate
framebuffer.

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  Mouse slow in Xorg fractional scaling

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[Bug 1902436] Re: Mouse slow in Xorg fractional scaling

2022-06-29 Thread Emmett Keyser
Daniel, no, fractional scaling does not render the desktop at a higher
resolution than your screen. Unless you are talking about xorg
"Screen"s. Fractional scaling renders in a _lower_ resolution. And a bug
is never expected - hence why it's called a bug. I don't even know why
you would categorize it as expected. Saying something about resolution
doesn't clear up why mouse tracking all of a sudden incorporates
latency.

I'm not even sure many people like fractional scaling. If one could
simply choose different integer scaling for different monitors that
would solve 90% of people's problems.

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Title:
  Mouse slow in Xorg fractional scaling

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[Bug 1902436] Re: Mouse slow in Xorg fractional scaling

2022-02-23 Thread Daniel van Vugt
** Summary changed:

- Mouse slow in fractional scaling
+ Mouse slow in Xorg fractional scaling

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  Mouse slow in Xorg fractional scaling

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