Lost iGPU after upgrading to the latest kernel

[Rom888]

I had enabled the iGPU using this manual: https://wiki.t2linux.org/guides/hybrid-graphics/#enabling-the-igpu

Today I upgraded the kernel to the latest using the update_t2_kernel command, and after reboot the system switched back to AMD dGPU.

There is still /etc/modprobe.d/apple-gmux.conf with the following contents:

# Enable the iGPU by default if present
options apple-gmux force_igd=y

But I see only AMD GPU (((

$ sudo lshw -C display | grep product:

product: Navi 14 [Radeon RX 5500/5500M / Pro 5500M]

$ lspci | grep VGA

03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 14 [Radeon RX 5500/5500M / Pro 5500M] (rev 40)
04:00.1 Non-VGA unclassified device: Apple Inc. T2 Bridge Controller (rev 01)
04:00.2 Non-VGA unclassified device: Apple Inc. T2 Secure Enclave Processor (rev 01)

my pc: macbook pro, 16 inch, 2019 have the Apple T2 Security Chip (hardware- controller-) model identifier: MacBookPro16.1 Intel Core i9 2.3g

Intel UHD graphics 630 AMD radeon pro 5500M

[AdityaGarg8]

Did you set up Apple-os-set bootloader? If yes, does Apple-os-set display when you boot Linux?

[Rom888]

Yes, $ sudo ls /boot/efi/efi/boot

.   bootx64.efi           fbx64.efi
..  bootx64_original.efi  mmx64.efi

from this repo:

git clone https://github.com/aa15032261/apple_set_os-loader
cd apple_set_os-loader
make
sudo mv /boot/efi/efi/boot/bootx64.efi /boot/efi/efi/boot/bootx64_original.efi
sudo cp ./bootx64.efi /boot/efi/efi/boot/bootx64.efi

and it worked before, but I don't see Apple-os-set display when boot Linux this time and didn't see before.

[Rom888]

Should I try this fork? https://github.com/Redecorating/apple_set_os-loader

[AdityaGarg8]

Can you share the md5sums of the efi files

[Rom888]

Now, I tried to reboot holding down the 'option' key, and then selected EFI boot. And after that I see Apple-os-set display and got iGPU back!

[Rom888]

Should I always boot holding down the 'option' key? I didn't do it before and iGPU worked.

[AdityaGarg8]

sudo mv /boot/efi/efi/boot/bootx64_original.efi /boot/efi/efi/boot/bootx64_original.efi.back
sudo cp /boot/efi/EFI/ubuntu/grubx64.efi /boot/efi/efi/boot/bootx64_original.efi

Run this

Then in startup manager, press and hold control while booting Ubuntu.

[Rom888]

Okay, I'm afraid of the side effects with this solution, I'd rather will boot while holding the "Option" key.

Anyway, thank you for your help and this wonderful project!

[AdityaGarg8]

Well that's your wish but the commands were to "fix" a "side effect" observed in your case due to grub.

[Rom888]

If I apply it, will I be able to boot MacOs? Is it resistant to future kernel and Ubuntu updates?

[AdityaGarg8]

Yes

[Rom888]

I did it, but no iGPU again ( What do you mean 'hold control'?

I can only see Apple-os-set display if I hold down the 'option' key while booting.

sudo mv /boot/efi/efi/boot/bootx64_original.efi /boot/efi/efi/boot/bootx64_original.efi.back
sudo cp /boot/efi/EFI/ubuntu/grubx64.efi /boot/efi/efi/boot/bootx64_original.efi

Run this

Then in startup manager, press and hold control while booting Ubuntu.

[AdityaGarg8]

I meant this guide https://wiki.t2linux.org/guides/startup-manager/#setting-linux-startup-disk-as-the-default-startup-disk

[Rom888]

I did it, and now I see apple-os-set display without holding down the 'option' key! Thank you very much!

I thought the apple-os-set display lives in the patched bootx64.efi and it is loaded first, but we didn't move it. So I don't understand why it works )