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Wouldn't be it possible to let Linux/Xorg give up GPU for a time Windows is used? Which could still let me access it via VNC from Windows. My native platform is

Wouldn't be it possible to let Linux/Xorg give up GPU for a time Windows is used? Which could still let me access it via VNC from Windows. My native platform is Xubuntu on AMD Renoir laptop.

genewitch 5y ago
If this uses vfio then no, the host never sees the GPU, it's blind to it from boot.
- throwaway2048 5y ago
  Not really a problem, you can unbind the VFIO driver
  - genewitch 5y ago
    > linux /vmlinuz-5.10.27-gentoo root=/dev/nvme0n1p2 ro amd_iommu=on iommu=pt pcie_acs_override=downstream,multifunction pci-stub.ids=10de:1b82,10de:10f0 the host never sees the card.
    - throwaway2048 5y ago
      thats using the pci-stub driver, not VFIO
- fulafel 5y ago
  What is stopping GPU hot plugging from working? There was this recent improvement at least: https://phoronix.com/scan.php?page=news_item&px=Linux-5.14-AMDGPU-Hot-Unplug https://phoronix.com/scan.php?page=news_item&px=Linux-5.14-A... edit: seems there are some howtos - eg https://github.com/joeknock90/Single-GPU-Passthrough https://github.com/joeknock90/Single-GPU-Passthrough
  - pizza234 5y ago
    Two reasons (in the context of a standard desktop user, not headless server): 1. Desktop environment, which uses the video card; this is not a big deal, since one can terminate the session 2. video drivers correctly and fully releasing the card; this is possible, but in my opinion, not stable.
pizza234 5y ago
It's technically possible, but not stable. On my system, it's not stable, so I prefer to have two cards, but YMMV.
guilhas 5y ago
That is already possible without the Looking Glass. Just regular libvirt GPU passthrough. I would say the use case here would be a machine that does not have a monitor connected, for example some Bitcoin mining server in the attic. With Looking Glass the game screen can get streamed to a ultrabook in your living room, with the server GPU performance

Wouldn't be it possible to let Linux/Xorg give up GPU for a time Windows is used? Which could still let me access it via VNC from Windows. My native platform is Xubuntu on AMD Renoir laptop.

genewitch 5y ago

If this uses vfio then no, the host never sees the GPU, it's blind to it from boot.

throwaway2048 5y ago
Not really a problem, you can unbind the VFIO driver
- genewitch 5y ago
  > linux /vmlinuz-5.10.27-gentoo root=/dev/nvme0n1p2 ro amd_iommu=on iommu=pt pcie_acs_override=downstream,multifunction pci-stub.ids=10de:1b82,10de:10f0 the host never sees the card.
  - throwaway2048 5y ago
    thats using the pci-stub driver, not VFIO
fulafel 5y ago
What is stopping GPU hot plugging from working? There was this recent improvement at least: https://phoronix.com/scan.php?page=news_item&px=Linux-5.14-AMDGPU-Hot-Unplug https://phoronix.com/scan.php?page=news_item&px=Linux-5.14-A... edit: seems there are some howtos - eg https://github.com/joeknock90/Single-GPU-Passthrough https://github.com/joeknock90/Single-GPU-Passthrough
- pizza234 5y ago
  Two reasons (in the context of a standard desktop user, not headless server): 1. Desktop environment, which uses the video card; this is not a big deal, since one can terminate the session 2. video drivers correctly and fully releasing the card; this is possible, but in my opinion, not stable.

pizza234 5y ago

It's technically possible, but not stable. On my system, it's not stable, so I prefer to have two cards, but YMMV.

guilhas 5y ago

That is already possible without the Looking Glass. Just regular libvirt GPU passthrough. I would say the use case here would be a machine that does not have a monitor connected, for example some Bitcoin mining server in the attic. With Looking Glass the game screen can get streamed to a ultrabook in your living room, with the server GPU performance