Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

[Matt Fagnani]

Baolu,

I tried to apply your patch after checking out 6.2-rc3 and origin/master 
but there were there the following errors.

git apply amd-iommu-amdgpu-boot-crash-2.patch
error: patch failed: drivers/pci/ats.c:382
error: drivers/pci/ats.c: patch does not apply

I manually changed drivers/pci/ats.c as shown in the patch. I built 
6.2-rc3 + the patch. 6.2-rc3 with the patch had the same black screen 
problem when booting. I added rd.driver.blacklist=amdgpu on the kernel 
command line to prevent amdgpu from being started while the initramfs 
was in use, and the black screen happened later in the boot as I 
described in my previous email. The journal showed the same two warnings 
and null pointer dereference which made amdgpu crash as I reported.

Thanks,

Matt