Public bug reported:
Hardware: MSI MPG X870E Carbon WiFi, AMD Ryzen 9 9950X, NVIDIA RTX 5080
OS: Ubuntu 24.04 LTS, kernel 6.14.0-29-generic
Driver: nvidia-driver-580-open (linux-modules-nvidia-580-open-6.14.0-29-generic)
Issue:
- On Windows 11 and GPU-Z: PCIe Gen5 x16 works correctly.
- On Ubuntu 24.04: `lspci -vv -s 01:00.0` always shows `Speed 2.5GT/s
(downgraded), Width x16`.
- Tested BIOS settings (Auto, Gen4 forced): Ubuntu still downgrades to Gen1.
- This causes severe performance loss.
Expected:
- PCIe link speed should be negotiated correctly as it does on Windows.
Steps to reproduce:
1. Install Ubuntu 24.04 with NVIDIA 580-open driver.
2. Run `lspci -vv -s 01:00.0 | grep LnkSta`.
3. Observe speed is stuck at 2.5GT/s.
Additional info:
- Secure Boot enabled, official Ubuntu package used.
- No hardware issues (validated under Windows).
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-modules-nvidia-580-open-6.14.0-29-generic 6.14.0-29.29~24.04.1+1
ProcVersionSignature: Ubuntu 6.14.0-29.29~24.04.1-generic 6.14.8
Uname: Linux 6.14.0-29-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 24 15:31:05 2025
InstallationDate: Installed on 2025-07-03 (83 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
SourcePackage: linux-restricted-signatures-hwe-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-restricted-signatures-hwe-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2125583
Title:
NVIDIA RTX 5080 runs at PCIe Gen1 speed on Ubuntu 24.04 with nvidia-
driver-580-open
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