Arch with Linux 5.12 up, does not seem to communicate properly at 250000 baud
Running 5.12.4-arch1-2 from 15.5, Repetier-Host 2.2.2 does not seem to communicate properly at 250000 baud with my 3D printer. It connects with "No start signal detected - forcing start" and "1 Command waiting" and does not show any temperatures as it normally would.
Other USB-serial devices such as Arduinos work fine at 9600 baud. Both CDC_ACM as the printer (/dev/ttyACMx) and ch341 (/dev/ttyUSBx). But, tried to make an Arduino sketch with 250000 baud serial communication and I get this:
Error while setting serial port parameters: 250,000 N 8 1
Tested 3D printer with a LUbuntu 18.04 laptop and that works fine so there is nothing wrong with the printer.