Windows user ejects graphics card, immediately regrets it — curiosity killed the VM acceleration

If you've never seen the option to eject your PC’s GPU, you aren’t alone. This feature of Windows is only seen in a few very specific situations. In YnosNava’s case, they were running “a Virtual Machine with PCIe passthrough under Proxmox.”

PCIe passthrough is a technique to benefit from improved video acceleration in a virtual machine. It basically speeds up GPU-sensitive operations in the virtual machine by providing direct access to the graphics card hardware. YnosNava appears to have been “playing around” with this feature in a Proxmox open-source server install, on the quest for improved performance.

One of the peculiarities of PCIe passthrough in a VM — in this case, at least — is that the GPU you have decided to directly access is listed among attached devices that are available to be ejected with the click of the mouse.

Learn from YnosNava’s mistake and save yourself some time — possibly a whole hour or more — if you are dabbling with a similar setup: Resist clicking ‘eject.’

That said, if you're unable to resist the urge, or if you accidentally click ‘eject’ using a similar setup, there’s a simple set of steps you can follow to get things back up and running.

“I deleted the GPU on my VM options, restarted the Windows VM. Then I added it again before restarting the machine again,” YnosNava explained in a follow-up comment to their thread. “From there, Windows detected it with problems and asked me to restart to fix the problem. After restarting, I reinstalled the drivers and voila!”

I can’t recall seeing an option to eject my GPU in Windows in all my computing years, but I also haven’t dabbled much in VMs. I have seen a similar option to "Safely Remove Hardware" or "Disconnect GPU" when testing out eGPUs attached by USB4, though. However, I've never been tempted to use this feature for switching the active GPU without restarting.

Mark Tyson is a news editor at Tom's Hardware. He enjoys covering the full breadth of PC tech; from business and semiconductor design to products approaching the edge of reason.