Set video resolution and refresh rate at boot?

[Alex Deucher]

On Thu, Aug 26, 2021 at 12:35 PM Paul <pb.g at gmx.de> wrote:
>
> Hi there
>
> Out of curiosity I would like to ask if it is possible to set a kernel command line parameter for my Radeon 6900XT
> that sets a specific resolution and refresh rate of a specific connected monitor.
>
> Ideally this parameter is set to the monitors used desktop (X11, Wayland) resolution/refreshrate.
>
> I did this for years with my Intel IGP's. I appended:
>
> video=HDMI-A-1:1920x1080 at 50
>
> to the kernel command line. This worked beautifully and the result was my monitor was preconfigured to a specific resolution and refresh
> rate from the first lines of the kernel to the desktop (X11) and it did not had to switch to anything else in between.
>
> Another nice side effect is when in X11 one switches to the console, or vice versa, via STRG+Fx, pretty much everyone has this annoying delay because
> the monitor has to switch between refresh rates again. With that preconfigured settings at boot this gave a very satisfying feeling, especially if one frequently
> switches between console and X11 (or wayland maybe).
>
> Is this kind of parameter implemented in the kernel/amdgpu driver?

It works the same for all drivers.  Just make sure the connector name
is correct.

Alex