I use Plymouth at boot time, which is working fine.
However, I have two displays, both connected via DisplayPort.
One of these two is rotated by 90 degrees. The other one, not-rotated display, is my primary one and shows the bios/UEFI menu.
My goal is now to rotate the image of the roated display by 90 degrees so that Plymouth is displayed correctly. For this, I found that one can add a kernel parameter: “video=DP-0:panel_orientation=left_side_up” Adding this, however, doesn’t rotate the display. Interestingly, changing DP-0 to DP-2, so that the main display is rotated, it works just fine.
I suspect that at boot time, DP-2 isn’t recognized as connected as the display doesn’t register itself with no signal. This also seems to be true as when I disconnect my main display, the display is used to show the BIOD/UEFI and it works fine.
So, I tried to force the output by adding “video=DP-0:3840x2160@60:D” as kernel parameter. This made no difference though, it’s still not working.
Does someone here have an idea, how to solve this?
This is how my GRUB_CMDLINE_LINUX_DEFAULT line looks currently:
GRUB_CMDLINE_LINUX_DEFAULT=“quiet splash udev.log_priority=3 video=DP-0:3840x2160@60:D video=DP-0:panel_orientation=left_side_up nvidia-drm.modeset=1”
Did I make a mistake here?
Thanks in advance!