On Wed, Apr 24, 2024 at 07:30:42AM +0200, Paul Menzel wrote: > On the Dell XPS 13 9360/0596KF, BIOS 2.21.0 06/02/2022, booting Linux > 6.9-rc5-00036-g9d1ddab261f3 with `pci=nobios`, the internal keyboard does > not work, and there are DRHD (IOMMU) errors and intel-lpss errors printed by > Linux. (As the keyboard does not work, I am unable to enter the LUKS > passphrase, and capture the Linux messages.) > > Is that option supposed to work, and should Linux be able to detect and > configure itself without the help from the system firmware? Linux definitely needs help from firmware to boot, but "pci=nobios" doesn't turn off very much, and I would think Linux would still boot on a machine like yours that has ACPI with MCFG/ECAM, etc. My guess is some early PCI config access before we set up ECAM is failing. You might be able to capture console output as a video, especially if you slow it down with boot_delay=. I've used something like "nosmp initcall_debug ignore_loglevel boot_delay=60 lpj=3200000" as a starting point. Must enable CONFIG_BOOT_PRINTK_DELAY for this to work. Bjorn
