I installed Arch on my new Dell 9300 following this guide: https://github.com/Spissable/arch-linux-installation/blob/master/README.md

Everything works fine, I can boot into my system. But there are two warnings when booting that popup before the normal systemd-boot output:

pci 0000:00:07.0: DPC: RP PIO log size 0 is invalid
pci 0000:00:07.2: DPC: RP PIO log size 0 is invalid

The only thing I could find to this was: https://www.spinics.net/lists/kernel/msg3763759.html I did a BIOS check and all hardware components are fine.

Any ideas to why this could happen?

  • Did you figure this out? I have the same warning in my Dell XPS 9300. Does this help: bugzilla.kernel.org/show_bug.cgi?id=209943 - it's because it's outside of specs for the USB 4. I would assume nothing to worry about, should be really a info message not error.
    – stephanmg
    May 27, 2021 at 17:20
  • By the way, do you see the can't query Synaptics device -1 message as well?
    – stephanmg
    May 28, 2021 at 8:44
  • Same issue, occasionally on Lenovo Yoga
    – userfuser
    Jun 3, 2022 at 16:07

1 Answer 1


It was a kernel bug, that recently got a working patch. You can use that or wait for the next kernel release.

See https://bugzilla.kernel.org/show_bug.cgi?id=209943

  • Can approve, bug got fixed with the patch.
    – mordax
    Sep 6, 2022 at 6:13

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