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I don't think removing the driver is enough to disable the card. It should still be draining your battery. You probably have to switch it off explicitly.

Can you disable the card from BIOS/(U)EFI?

Otherwise you could try one of these:

https://superuser.com/questions/541854/disable-specific-pci-device-at-boot

https://unix.stackexchange.com/questions/73908/how-to-reset-cycle-power-to-a-pcie-device

https://askubuntu.com/questions/4546/how-do-i-turn-off-pci-devices

You just have to get the PCI device ID/path of your graphics card. Use lspci and consult man lspci for details.

I don't think removing the driver is enough to disable the card. It should still be draining your battery. You probably have to switch it off explicitly.explicitly. EDIT: Use powertop as suggested by @snowolfe in a comment below to find out whether your graphics card really is draining power. If it isn't you can stop here.

If your card is still running:

Can you disable the card from BIOS/(U)EFI?

Otherwise you could try one of these:these links:

  • https://superuser.com/questions/541854/disable-specific-pci-device-at-boot

  • https://unix.stackexchange.com/questions/73908/how-to-reset-cycle-power-to-a-pcie-device
  • https://unix.stackexchange.com/questions/73908/how-to-reset-cycle-power-to-a-pcie-device

  • https://askubuntu.com/questions/4546/how-do-i-turn-off-pci-devices
  • https://askubuntu.com/questions/4546/how-do-i-turn-off-pci-devices

You just have to get the PCI device ID/path of your graphics card. Use lspci and consult man lspci for details.