On Sat, Nov 16, 2024 at 06:19:36PM +0100, Greg Kroah-Hartman wrote: > Look in the bios, that seems to be the "old" pnp serial device? Does it > really have a serial port on the board? Yeah, there is a COM1 connector and I've attached a serial port brace to have the connector on the back of the board. > Is it enabled properly? BIOS says: Serial(COM) Port 0 Configuration Port Enabled Settings IO=3F8H, IRQ=4 It was on "Auto" before but neither setting changed anything. I don't know how relevant this is about that same PCI device: pnp 00:06: [dma 0 disabled] I'll try to upgrade the BIOS, maybe it really is an ACPI f*ckup. Thx! -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette