Yes, it is an AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx (Picasso)
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https://bugs.launchpad.net/bugs/1877889
Title:
Intermittent hangs on boot Ubuntu 20.04 on Lenovo E595
Setting the kernel parameter iommu=soft seems to solve this problem.
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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1877889
Title:
Intermittent hangs on boot Ubuntu 20.04 on Lenovo E595
I am now able to reproduce this behaviour. Booting to blackscreen (after LUKS
encryption) only occurs with an unplugged power adapter and NOT with a plugged
one.
With Ubuntu 18.04.5 (Kernel is the same 5.4.0-56, but complaining about missing
amdgpu renoir drivers) the problem in my tests did NEV
Same problem here with Lenovo V15-ADA Devices. We do have about 60 laptops and
nearly all show the same behaviour more or less often.
The workaround that helped for me with kernel 5.4.0-54 or lesser was building
the amdgpu kernel modules version 20.30. But with upgrade to kernel 5.4.0-56
this no
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