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0xbb / gpu-switch

gpu-switch is an application that allows to switch between the graphic cards of dual-GPU Macbook Pro models
MIT License
537 stars 57 forks source link

Couldn't mount 'efivarfs' on Linux #51

Closed takeonelayer closed 2 years ago

takeonelayer commented 4 years ago

When I try the command 'sudo ./gpu-switch -i', the following error shows up:

mount: /sys/firmware/efi/efivars: unknown filesystem type 'efivarfs'. Fatal: Couldn't mount '/sys/firmware/efi/efivars'.

I am using MacBookPro 15,1 (Mid 2018), already tried using apple_set_os.efi / spoof_os_version = 10.9 under rEFInd

Would be really appreciated if someone can help.

cristianmiranda commented 4 years ago

I'm having exactly the same issue. I'm able to see the Intel card using refind, but can't use gpu-switch to make it effective. Any updates on this?

Redecorating commented 2 years ago

you probably have efi=noruntime as a kernel parameter. This disables efi runtime services such as nvram, as one runtime call used for nvram writes is broken on T2 Macs. This patch fixes that issue, so efi=noruntime is no longer needed to prevent nvram writes, as they won't cause crashes anymore. https://lore.kernel.org/all/20220112101413.188234-1-ardb@kernel.org/

takeonelayer commented 2 years ago

thanks @Redecorating I'm now using your t2 arch wifi-iso, it works perfectly! (though i know this recent kernel fix is commonly adopted.) Closing this ticket as Resolved.