On Wed, Mar 20, 2024 at 09:21:34PM +0100, Heiner Kallweit wrote: > On 20.03.2024 16:59, Andy Shevchenko wrote: > > On Wed, Mar 20, 2024 at 03:56:29PM +0100, Heiner Kallweit wrote: ... > > grep 0000001b /sys/kernel/debug/pinctrl/*/pins > > pin 3 (GPPC_B_3) 3:INTC1057:00 GPIO 0x80100102 0x0000001b 0x00000000 [LOCKED tx] > pin 82 (GPP_F_7_EMMC_CMD) 135:INTC1057:00 GPIO 0x44000300 0x0000001b 0x00000000 [LOCKED full, ACPI] > pin 182 (GPPC_C_13) 269:INTC1057:00 GPIO 0x44000300 0x0000001b 0x00000000 [LOCKED full, ACPI] I was not correct, the value to grep is '0000[0-3][0-9a-f]1b' as there pull up/down can be enabled. Nevertheless from the above the pin 3 is one that is enabled as GPIO input with RTE 27 and direct IRQ. If it's a culprit, try to add in the pinctrl-intel.c at the end of .probe: { void __iomem *padcfg0; u32 value; padcfg0 = intel_get_padcfg(pctrl, 3, PADCFG0); value = readl(padcfg0); value |= PADCFG0_GPIOTXDIS; value |= PADCFG0_GPIORXDIS; writel(value, padcfg0); } If it helps, it will show the BIOS bug (likely). -- With Best Regards, Andy Shevchenko