Hi Rauno,
Thanks for reporting this bug; nice finding on pci=noats.
$ grep -A1 noats ~/git/linux/Documentation/admin-guide/kernel-parameters.txt
noats [PCIE, Intel-IOMMU, AMD-IOMMU]
do not use PCIe ATS (and IOMMU device IOTLB).
Wondering if the amd gfx drivers with ats/iommu (ie, w/out pci=noats) causes
memory corruption:
The screenshot in #1 shows that initramfs unpacking failed -- say,
something corrupted the compressed initramfs image loaded in memory --
and this happened closely to when AMD-Vi failed to access an IOMMU perf
count(er? I guess.)
And it seems to be graphics related, not just ats/iommu code alone,
which prints 'AMD-Vi' (it's in linux/drivers/iommu/amd/) since recovery
mode, with 'nomodeset', works fine.
When you boot in recovery mode, do you see initramfs unpacking failed as
well? (please check 'dmesg | grep -i initramfs')
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https://bugs.launchpad.net/bugs/1901024
Title:
Crash on startup using linux 5.8.0-25
Status in linux package in Ubuntu:
Confirmed
Bug description:
I installed Ubuntu 20.04 on my new Lenovo ThinkPad L15 and upgraded it to
Ubuntu 20.10 for a newer kernel to fix minor compatibility issues with AMD
Renoir.
When using the newer kernel it freezes before splash. I did my best to follow
instructions to create a crash file but none were ever created.
Booting to recovery mode with 5.8 works, 5.4 kernel works. Booting from USB
the (safe graphics) option works but not the default. On that USB I have latest
available daily build (Oct 21 2020) of 20.10. I tried a fresh reinstall of
Ubuntu 20.10 and still getting stuck.
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