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[BUG] HP Omen Transcend 16 (8C4D) Missing PCI Quirk #844

@Kody-Schram

Description

@Kody-Schram

Pre-flight checklist

  • I have searched existing issues and this is not a duplicate.
  • I have read the Contributing Guidelines.
  • I have verified the issue is reproducible with the latest available CachyOS kernel.
  • I have tried to reproduce the issue on Arch Linux's linux kernel.

Upstream / vanilla kernel check

I have not tested with a vanilla/upstream kernel

Kernel variant

linux-cachyos (EEVDF, Clang)

System information (cachyos-bugreport.sh)

https://paste.cachyos.org/p/1c10bae.log

Manual system information (if cachyos-bugreport.sh is unavailable)


Bug description

Running the default CachyOS boot option from Grub refuses to boot. I can only get it to boot when providing pci=nobar (this option disables my touchpad, builtin speakers, and likely my nvidia gpu although i havent tested this)

Steps to reproduce

Boot from default CachyOS boot option

Expected behavior

Boot into the system with hardware components functional

Actual behavior

Boot process will often hang when loading kernal modules. This also fails to go into emergency shell.

Image

I ran with splash off and loglevel=7 and managed to get into emergency shell. Im not sure if this was a deterministic result of these inputs or just a coincidence (id imagine its a coincidence). I tried saving the output by running journalctl -xb > /boot/emergency_shell.log. Unfortunately this didnt save despite the command executing in emergency shell.

In the process of getting sufficient logs for this issue, i had one default boot in which i fully booted in and was able to login. Additionally my touchpad worked for a few seconds, until i used my mouse which is connected through a 2.4 ghz dongle. Afterwards the touchpad stopped working. Im not sure if that was also a coincidence or a result of switching inputs.

dmesg_success.txt

I also had marginal success with DSDT patching. Following the patches from this repo, implementing all but #4, i had one boot where i could use my touchpad and speakers. However since then with the same patch i have been unable to even boot into my system again. It is important to note i am running F.28 rather than F.27 which this patch is intended for.

Logs / stack traces


Additional system information

No response

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