I was trying to install kernel 5.9-rc5 manually in my mid-2015 MacBook Pro, but the graphics did not work. I could only boot using nomodeset.
It was due to: https://bugs.debian.org/935270
You can download patch from https://salsa.debian.org/kernel-team/linux.git
- debian/patches/features/x86/intel-iommu-add-option-to-exclude-integrated-gpu-only.patch
- debian/patches/features/x86/intel-iommu-add-kconfig-option-to-exclude-igpu-by-default.patch
apply patch on your kernel:
patch -p1 < LOCATION/intel-iommu-add-option-to-exclude-integrated-gpu-only.patch patch -p1 < LOCATION/intel-iommu-add-kconfig-option-to-exclude-igpu-by-default.patch
configure and compile your kernel:
$ make menuconfig $ make bindeb-pkg