I have a Lenovo A485. Kernel 4.18.12 works fine for me, but I have tried almost all the RC's (1, 5, 6, 7) and the screen turns black when GRUB would normally be showing "loading initramfs" or it freezes when it's showing "loading initramfs".
05:00.0 VGA compatible controller : Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] [1002:15dd] (rev d0)
I found this bug report which seemed similar to what I was experiencing, but my firmware is up to date https://bugs.freedesktop.org/show_bug.cgi?id=107880
[ 2.814558] [drm] Found VCN firmware Version: 1.73 Family ID: 18
I tried: modprobe.blacklist=amdgpu and that did not change anything.
Let me know how I can help troubleshoot this problem. Thanks.
Can you bisect? If you set modprobe.blacklist=amdgpu on the kernel command line in grub and you are still getting a problem, it's an issue outside of the graphics driver. If so, does setting pci=noacpi help?
Created attachment 141966 [details]
Booting with pci noacpi
I was able to get something on the screen when I added "pci=noacpi" (this was without blacklisting amdgpu).
[Firmware Bug]: AMD-Vi: No southbridge IOAPIC fonud
AMD-Vi: Disabling interrupt remapping
platform USBC000:00 failed to claim resource 0: [mem ...]
acpi USBC000:00: platform device creation failed: -16
AMD-Vi: Unable to write to IOMMU perf counter.
I uploaded an attachment which shows the full output (I only typed out the first several lines).
I might be able to bisect if needed. Does the image I uploaded show you anything useful?
I just tested on the latest git (v4.19-rc7-15-g64c5e530ac2c) and I didn't see any issues. So the issue has been either fixed between 4.19-rc7 and latest git or something in the kernel config is different.
Sounds like it may be related to:
It turns out it is config related, as I compiled the kernel with my old config instead of a minimal one, and I had the same boot issue. I posted about my issue here https://bugzilla.kernel.org/show_bug.cgi?id=200087 since that may be the same bug.