Bug#1012210: linux-image-5.10.0-14-amd64: Kernels of Bullseye and Testing (5.10 and 5.17) hang at boot

[Markus Kolb <markus@kolbs-net.de>]

Am 2. Juni 2022 13:42:54 UTC schrieb Markus Kolb <debian@tower-net.de>:
>Because the kernel.org 5.10.113 with my stripped down config is running successful,
>I've rebuilt this kernel.org 5.10.113 with the Debian config /boot/config-5.10.0-14-amd64 via make oldconfig.
>There are some differences between kernel.org and Debian in the config, I've put the config diff bug-1012210-kernel-config-changes.patch in the attached tar.xz.
>This kernel also boots successful.
>
>I think the problem is introduced by a Debian patch which handles the config
>  CONFIG_INTEL_IOMMU_DEFAULT_ON_INTGPU_OFF=y
>because this is not available in kernel.org 5.10.113.

[...]
> https://salsa.debian.org/kernel-team/linux/-/blob/bullseye-security/debian/patches/features/x86/intel-iommu-add-kconfig-option-to-exclude-igpu-by-default.patch
> https://salsa.debian.org/kernel-team/linux/-/blob/bullseye-security/debian/patches/features/x86/intel-iommu-add-option-to-exclude-integrated-gpu-only.patch
[...]
I've patched the kernel.org 5.10.113 just with these 2 Debian patches and at least I can confirm, that these changes are the cause.
Although I don't understand at the moment where the difference of intel_iommu=on with patch and the defaults without patch could be.
Will have a closer look tomorrow.