eGPU only getting PCIe 1.1 (2.5 GT/s)

Hello everyone, it's me again. When i try to use an AMD eGPU (7700xt), i only get PCIe 1.1 (2.5 GT/s) speeds instead of PCIe 3.0 speeds (8 GT/s) according to sudo lspci -vv.

Also, the AMD Link speed fix from all-ways-egpu github doesnt work: Create a file named: /etc/modprobe.d/amd-pcie-fix.conf with the following content: options amdgpu pcie_gen_cap=0x40000

Hardware:
Lenovo Legion Go
ADT-Link UT3G Adapter
550W PSU
RX 7700XT

Is there any help or hope for me? I really, really want to use Bazzite with eGPU!

Thank you very much in advance!

HikariKnight•1/24/25, 10:11 AM

https://docs.bazzite.gg/Advanced/dracut-and-initramfs/?h=modprobe

How to Modify Initramfs and Dracut - Bazzite Documentation

Bazzite is a custom image built upon Fedora Atomic Desktops that brings the best of Linux gaming to all of your devices.

cr4nkzOP•1/24/25, 8:05 PM

That does NOT work for me. Cant boot after doing the procedure.

HikariKnight•1/25/25, 2:18 AM

and you wrote it as "amdgpu.pcie_gen_cap=0x40000""amdgpu.pcie_gen_cap=0x40000" for the karg?

cr4nkzOP•1/25/25, 5:52 AM

Yes sir, altough i am not really good with linux. Is there a possibility you can walk me through the process or will it be Updated soon so i can retry?

Ccr4nkz Yes sir, altough i am not really good with linux. Is there a possibility you can...

HikariKnight•1/25/25, 12:11 PM

i literally wrote the guide i linked, it will be identical
if you need to remove the karg just boot up the pc press ESC to get into grub and press E then remove amdgpu.pcie_gen_cap=0x40000amdgpu.pcie_gen_cap=0x40000 from the linux line
then press CTRL+X to boot, then when in the system run rpm-ostree kargs --delete-if-present="amdgpu.pcie_gen_cap=0x40000"rpm-ostree kargs --delete-if-present="amdgpu.pcie_gen_cap=0x40000" to remove the kernel argument

cr4nkzOP•1/25/25, 6:23 PM

Okay i will try it again. Most likely i messed up because i am not used to Linux. Do i have to put 0x80000 or 0x40000?

Ccr4nkz Okay i will try it again. Most likely i messed up because i am not used to Linux...

HikariKnight•1/25/25, 6:43 PM

no idea as i never used this command, i dont use egpus

Ccr4nkz Hello everyone, it's me again. When i try to use an AMD eGPU (7700xt), i only ge...

Freddy•2/10/25, 10:17 PM

Hi did you ever fix this? Running into this on my GPD Win 4 6800u, over eGPU thunderbolt, on GPD G1(7600m XT)

Freddy•2/10/25, 10:35 PM

I’m going to try Hikari’s written guide and see if I can figure it out. Checked ‘sudo lspci -vv’ and it’s indeed saying 2.5 GT.

I should note that I recently switch to bazzite-deck-stable from bazzite-gnome desktop image; this was not a problem with usb4 eGPU on the win 4 but it is on the deck image for some reason.

Freddy•2/11/25, 7:14 AM

reporting back that this worked like a charm after following the guide. Allowed my eGPU to be detected in LACT too, even though mission center saw it, lact didn't. LACT also reports 8 GT/s now. Thank you.

eGPU only getting PCIe 1.1 (2.5 GT/s)

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