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‎04-04-2025 04:20 PM - edited ‎04-04-2025 04:28 PM

HP Recommended
Product: HP Z6 G5 A Workstation Desktop PC (7D8B9AV)

Hello everyone,

I'm currently running an HP Z6 G5A with an RTX 5090 and running Ubuntu 24, and it appears there might be a PCIe 5.0 compatibility issue affecting Nvidia Blackwell GPUs (and possibly others with PCIe 5.0). Here’s what I experienced and how I resolved it:

The Issue:

When swapping in the RTX 5090, Windows boots without issue, but Linux (Ubuntu 24 or any Linux ISO from a USB stick) hangs during kernel initialization.

Workaround Steps:

 

1. BIOS Update:

  • Update your HP Z6 G5A to the latest BIOS version.

2. Kernel & Drivers:

  • Install the latest Linux kernel and drivers (I'm currently on kernel version 6.13.7-061307-generic) along with the latest Nvidia driver from the official website.

3. PCIe Port Configuration:

  • Insert the RTX 5090 into a PCIe 5.0 port (tested on both PCIe 1 and PCIe 4).
  • In the BIOS, change the maximum speed from Auto to Gen4 and enable BAR resize for that port.
  • Save and attempt to boot. It will still hang - this is expected.

4. Reset Process:

  • Use Ctrl+Alt+Del to reboot.
  • Go back into the BIOS and disable BAR resize.
  • Save and try booting again; it should now boot up successfully.

5. Final BIOS Adjustment:

  • Once booted, re-enter the BIOS and set the PCIe port back to Gen5. No further BIOS changes are required.

I hope this detailed workaround helps anyone encountering a similar issue.

 

 

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