Hi Marc, > Can you test v6.11? Not that easy, but what I at least did was to copy the mcp251xfd drivers from the 6.11 kernel to my 6.6 kernel and gave it a try, same result: [ 45.126666] mcp251xfd spi1.0 canfd1: IRQ handler mcp251xfd_handle_tefif() returned -22. [ 45.126694] mcp251xfd spi1.0 canfd1: IRQ handler returned -22 (intf=0xbf1a0010). > I'm not 1000% happy with stable at the moment > when it comes to the mcp251xfd driver. I'll be away next week, but after that I can at least continue testing and maybe write some code ;-) Regards, Sven