Phosh / Settings / Displays menu inconsistent among devices

Devices:
oneplus-fajita
xiaomi-beryllium

release: v24.12
environment: Phosh

Both devices have a 6" screen. I'd like to use both with 250% in Settings/Display/Scale. On oneplus-fajita I can do this, because it gives me a drop-down menu with scale factors from 100% to 300% in 25% steps. On xiaomi-beryllium I can't, because it only gives me two buttons 100% and 200%.

The default setting is 300% for both btw. So on xiaomi-berylium one can't even select the default via the dialog.

changed the description

added release-edge release-v24.12 labels

removed release-edge label

added device-oneplus-fajita device-xiaomi-beryllium ui-phosh labels

a (temporary) workaround is to open a shell on -beryllium and run wlr-randr --output "DSI-1" --scale 2.5.

Needs to be run after each boot.

I had tried that via SSH, but it didn't work:

$ DISPLAY=:0 wlr-randr --output DSI-1 --scale 2.5
failed to apply configuration

(and yes, I had checked on device, that $DISPLAY was actually :0.)

Running the command on the device directly worked however. Still, I believe that a GUI that can change a default setting, should also be able to restore the default setting. And it puzzles me, why the same software on two very similar devices uses different UI elements.

Just in case for future experiments It's Wayland, hence WAYLAND_DISPLAY=wayland-0 … (DISPLAY applies to X11 only`)

Thanks! I'm still pretty new to Wayland. However, according to the output on the device I'm on wayland-4 right now. But via SSH I only get an empty output:

xiaomi-beryllium:~$ WAYLAND_DISPLAY=wayland-4 echo $WAYLAND_DISPLAY

xiaomi-beryllium:~$

Use:

WAYLAND_DISPLAY=wayland-4 wlr-randr`

or

WAYLAND_DISPLAY=wayland-4
wlr-randr

Another nice trick is to use

screen

in a graphical terminal on the device

and then log in via ssh and use screen -x. You then get the exact environment in the ssh session than you have on the device.

One can also specify the scaling in phoc.ini.

The algorithm to determine the available scales discards one the don't end up on full pixels, so that's likely what's going on here. What's max the resolution of the xiaomi-beryllium?

1080x2246 px

One can also specify the scaling in phoc.ini.

Yes, that works:

$ cat /etc/phosh/phoc.ini 
[output:DSI-1]
scale = 2.5

1080x2246 px

Thanks, yeah: 2245 / 2.5 = 898.4 so that resolution is discarded as we don't end on a pixel boundary.

Well, if it were actually 1080x2245 (sic) everything would be fine.

There doesn't happen to be an option to somehow ditch that one pixel line (preferably on the top, under the notch)? I believe under X11 that would be possible by defining a virtual monitor.

The way it is now, the default 300% also doesn't end on a pixel boundary.

You can define modes in phoc.ini as in X11 (see the man pages), but i doubt the panel would accept it (as it is fixed resolution).

No virtual monitors though, compositor could leave the one line black but it doesn't know about that.

wlr-randr and phoc.ini don't bother and accept any fractional scale (that is representable in the protocol), only the fractional scale calculations in phosh cares about that.