+++ /dev/null
-# Linux display
-
-This iis detailed in depth on [how does Linux's display works?](https://unix.stackexchange.com/questions/596894) QA.
-
-On most desktops system (like KDE or Gnome) there are settings available on their respective settings panel, this guide is for additional/manual settings that can be applied to scale an application or the whole desktop. This [reference article](https://wiki.archlinux.org/index.php/HiDPI) have many valuable informations for the matter.
-
-## Scaling applications
-
-Scaling application can be done mainly via [DPI](https://unix.stackexchange.com/questions/596765/is-x-dpi-dot-per-inch-setting-just-meant-for-text-scaling), specific environment variable (explained bellow), application own setting or some specific desktop setting (out of scope of this QA).
-
-* Qt applications can be scaled with the following environment variables, note that many applications are hard-coding sizing and font and thus the result on such app may not be as expected:
-
-```sh
- export QT_AUTO_SCREEN_SET_FACTOR=0
- export QT_SCALE_FACTOR=2
- export QT_FONT_DPI=96
-```
-
-* Gnome/GTK applications can be scaled with the following environment variables:
-
-```sh
- export GDK_SCALE=2
- export GDK_DPI_SCALE=0.5
-```
-
-* Gnome/GTK can as well be scaled globally with this Gnome setting:
-
-```sh
- gsettings set org.gnome.desktop.interface text-scaling-factor 2.0
-```
-
-* Chromium, can be scaled with the following command:
-
-```sh
- chromium --high-dpi-support=1 --force-device-scale-factor=1.5
-```
-
-* [Xpra](https://en.wikipedia.org/wiki/Xpra) (python) can be used along with i[Run scaled](https://github.com/kaueraal/run_scaled/blob/master/run_scaled) to achieve a per app scaling.
-
-* Environment variables modification can be placed in `~/.profile` for a global and automatic appliance after login.
-
-## Scaling the desktop with Xorg X11
-
-[Xorg](https://wiki.archlinux.org/index.php/Xorg)'s extension RandR have a scaling feature and can be configured with [`xrandr`](https://wiki.archlinux.org/index.php/Xrandr). This can be used to scale the desktop to display a bigger environment, this can be useful for HiDPI (High Dots Per Inch) displays.
-
-RandR **can also be used the other way around**, example making a screen with 1366x768 max resolution support a greater resolution like 1920x1080. This is achieved by simulating the new greater resolution while rendering it for the supported max resolution, similar to when we watch a Full-HD video on a screen that is not Full-HD.
-
-## Scaling the desktop without changing the resolution
-
-* Getting the screen name:
-
-```sh
- xrandr | grep connected | grep -v disconnected | awk '{print $1}'
-```
-
-* Reduce the **screen size** by 20% (zoom-in):
-
-```sh
- xrandr --output screen-name --scale 0.8x0.8
-```
-
-* Increase the **screen size** by 20% (zoom-out):
-
-```sh
- xrandr --output screen-name --scale 1.2x1.2
-```
-
-* Reset `xrandr` changes:
-
-```sh
- xrandr --output screen-name --scale 1x1
-```
-
-## Scaling the desktop and simulate/render a new resolution
-
-When using `xrandr` to "zoom-in" with the **previous method**, the desktop remain full screen but when we "zoom-out" with for instance `xrandr --output screen-name --scale 1.2x1.2` (to get an unsupported resolution) the desktop is not displayed in full screen because this require updating the resolution (to probably a higher unsupported resolution by the screen), we can use a combinaison of `--mode`, `--panning` and `--scale`, xrandr's parameters to achieve a full screen "zoom-out" scaling (simulate a new resolution), example:
-
-* Get the current setup:
-
-```sh
- xdpyinfo | grep -B 2 resolution
- # or
- xdpyinfo
-```
-
-* Configuration example:
-
-```
- Scaling at: 120%
- Used/max screen resolution: 1366 x 768
- Resolution at 120% (res x 1.2): 1640 x 922 (round)
- Scaling factor (new res / res): 1.20058565 x 1.20208604
-```
-
-* The idea here is to increase the screen resolution virtually (because we are limited to 1366x768 physically) the command would be (replace screen-name):
-
-```sh
- xrandr --output screen-name --mode 1366x768 --panning 1640x922 --scale 1.20058565x1.20208604
-```
-
-* Reset the changes with:
-
-```sh
- xrandr --output screen-name --mode 1366x768 --panning 1366x768 --scale 1x1
-
- # restarting the desktop may be required example with KDE
- # kquitapp5 plasmashell
- # plasmashell &
-```
-
-## Making xrandr changes persistent
-
-There is a multitude of methods to make `xrandr` changes persistent, [this](https://unix.stackexchange.com/questions/125556/how-can-i-make-xrandr-changes-persist) and [this](https://askubuntu.com/questions/63681/how-can-i-make-xrandr-customization-permanent) QA have many examples.
-
-## Experiments notes
-
-As a side note and experiments result while using SDDM + KDE, and after many tests to achieve a persistent config, I ended up loading a script with `~/.config/autostart` (`systemsettings5` > Startup... > Autostart), and naming my script `00-scriptname` to make it run first.
-
-```sh
-# 00-scriptname
-
-# Applying the main xrandr suited changes (scaling at x1.15)
-
-xrandr --output eDP1 --mode 1366x768 --panning 1574x886 --scale 1.15226939x1.15364583
-
-# This is where it get odd/complicated, sometimes the screen resolution is not applied correctly or not applied at all...
-# Note that "xrandr --fb" can be used alone to change the screen resolution on a normal situation...
-# Here we will be taking advantage of xrandr's "--fb" feature to make the config appliance stable and works every-time.
-
-# The odd thing here is while re-applying the new resolution 1574x886 with "--fb" nothing happen, but
-# if we use use an unsupported resolution like 1574x884 (vs 1574x886) then xrandr force the resolution
-# to "reset itself" to the configured resolution (1574x886)...
-
-# In short just re-apply the setting with "--fb" and an unsupported resolution to force a reset.
-# ("--fb" can be used alone here without re-applying everything)
-
-#xrandr --fb 1574x884
-xrandr --fb 1574x884 --output eDP1 --mode 1366x768 --panning 1574x886 --scale 1.15226939x1.15364583
-```
-
-
git://git.nikiroo.be / notes.git / commitdiff