> Thorsten > why do you pass pci=nomsi It's a workaround for another issue i've been facing for about 2 or 3 years, since when I first tried out Linux (started with loading Kubuntu and Mint live images). Without that workaround Kubuntu didn't boot for me - on kernel 5.8 it only reached the graphic installer part, but hung after language selection menu, on 5.4 and 5.11 - didn't even reach the graphic session. With Mint it was more severe - the screen was flooded with PCIe errors, like so: Apr 10 18:47:08 bong last message buffered 3 times Apr 10 18:47:08 bong kernel: pcieport 0000:00:1c.5: device [8086:9d15] error status/mask 000001/00002000 Apr 10 18:47:08 bong kernel: pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID) Apr 10 18:47:08 bong last message buffered 5 times Apr 10 18:47:08 bong kernel: pcieport 0000:00:1c.5: device [8086:9d15] error status/mask 000001/00002000 Apr 10 18:47:08 bong kernel: pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID) Apr 10 18:47:08 bong last message buffered 13 times Apr 10 18:47:08 bong kernel: pcieport 0000:00:1c.5: device [8086:9d15] error status/mask 000001/00002000 Apr 10 18:47:08 bong kernel: pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID) Apr 10 18:47:08 bong last message buffered 5 times Apr 10 18:47:08 bong kernel: pcieport 0000:00:1c.5: device [8086:9d15] error status/mask 000001/00002000 Apr 10 18:47:08 bong kernel: pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID) Apr 10 18:47:08 bong last message buffered 6 times `pci=nomsi` saved me also during Debian installation - without it the live ISO just crashed mid-installation. But it wasn't a complete cure for Debian- and Ubuntu-based distros, and they still crashed even with this parameter (I don't know how exactly, at least they didn't flood with PCIe bus errors). Since I moved to Manjaro, Void, Arch and now to Gentoo (which bases its config on the Fedora one), PCIe errors were my only trouble, which was easily mitigated with `pci=nomsi`. Recently I discovered that without it one of the kernel modules (irq/124-aerdrv) had high CPU load, so double useful. https://forums.linuxmint.com/viewtopic.php?p=2237628 Just googled and there's a guy with a very similar model as me (UVK instead of UAK) and same issues, but `noaer` and `nomsi` work identically for me (I found `nomsi` in a different thread). Since I'm building my own kernel for the last 3 months, I've disabled the MSI in kernel config - and with that, a big part of IOMMU part as well: https://git.sr.ht/~acid-bong/kernel/commit/cac5c09dec0bea919ca071a9b738108b0d8a8ee5 but I did it _after_ I first experienced the issue I described in the thread head, hoping that it'll save me from these hangs as well. It didn't. I'm keeping it in the bootloader config for cases when I boot with a prebuilt Gentoo kernel, and add every time I'm booting with Arch or Void live USB for rescue purposes. It's not a constant issue tho, happens every other time. --- > Bagas > Have you tried testing latest mainline? Just built and will boot in a moment. But we'll gotta wait for a couple of days, since the hanging is unexpected.
