Hi again Marius, On Sun, 4 Jun 2023 16:01:32 +0200, Jean Delvare wrote: > IRQ number 255 indeed looks suspicious, but I'm also not aware of this > being a special value (nr_irqs is defined as an unsigned int, which > suggest that large IRQ numbers, albeit unusual on desktop and laptop > systems, are supported and frequently seen on large server systems), so > the i2c-i801 driver has no reason to handle it in a particular way. OK, I stand corrected. There's this interesting comment in drivers/acpi/pci_irq.c:acpi_pci_irq_valid(): /* * On x86 irq line 0xff means "unknown" or "no connection" * (PCI 3.0, Section 6.2.4, footnote on page 223). */ So that's probably what you are seeing on your Dell laptop. Unfortunately this function is static inline, so we can't call it from the i2c-i801 driver. It's called by acpi_pci_irq_enable() but only if (gsi < 0), which isn't the case on your system. -- Jean Delvare SUSE L3 Support
