Arch Linux

OK38

Member

Registered: 2014-08-07

Posts: 17

Boot dual screen resolution and rotation

Hello,

I can't seem to set the resolution of a dual screen (4k and FHD) correctly in the framebuffer. I mean, even if I try to put a kernel parameter in loader entries, the best I can get is an ugly FHD on a 4K screen or an FHD that only fills a quarter of the larger screen.

I am using AMD Vega 64 (amdgpu) and systemd-boot config (I also tried with grub).

/boot/loader/entries/arch-lts.conf kernel parameters line and result :

options root="PARTUUID=****" rw systemd.show_status=yes video=HDMI-A-3:1920x1080 video=DP-1:3840x2160

+----------------+----------------+
|                |                |
|                |                |
+----------------+                |
|                                 |
|                                 |
+---------------------------------+

/boot/loader/loader.conf

default         arch-lts.conf
timeout         0
console-mode	2
editor          no

Amdgpu module set on mkinicpio.conf

MODULES=(amdgpu)

Is it possible to set properly different resolution on each screen and rotate one of them ?

Thank you.

seth

Member

Registered: 2012-09-03

Posts: 60,435

Re: Boot dual screen resolution and rotation

You mean you want a multiscreen setup where the framebuffer console displays different things on different outputs like on X11 or wayland compositors?

+---------------------------------+ +------+
|                                 | |      |
|                                 | |      |
|                                 | |      |
|                                 | |      |
|                                 | |      |
+---------------------------------+ +------+

Your best shot is probably https://wiki.archlinux.org/title/KMSCON

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OK38

Member

Registered: 2014-08-07

Posts: 17

Re: Boot dual screen resolution and rotation

I'll take a look at this, thank you.