update 'xen-4.14.4' fails boot for 'Above 4G' bios option

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update 'xen-4.14.4' fails boot for 'Above 4G' bios option #7308

Closed fiddler-on-the-roof closed 2 years ago

fiddler-on-the-roof commented 2 years ago

How to file a helpful issue

Qubes OS release

4.1

Brief summary

black screen on boot after update xen to (testing) 4.14.4 turning off 'Above 4G' in UEFI BIOS is the cure

Steps to reproduce

up-to-date R4.1
AMD GPU
AMG CPU
AMI BIOS
turn on 'Above 4G' in BIOS
try to update from 'current-testing' for 'xen*'

Expected behavior

still working with the current BIOS options on reboot

Actual behavior

black screen on reboot
turn off 'Above 4G' in BIOS
now boot is OK
also update xen to 4.14.4-1.57 from unstable does not help with same behavior

marmarek commented 2 years ago

What is the exact BIOS setting name?

Try removing console=none option from xen cmdline (in grub) - does it give you more details?

fiddler-on-the-roof commented 2 years ago

It is 'Above 4G decoding' at 'Boot' page, with help about 'device decoding at boot stage'. Enabling 'console' shows xen boots kernel OK, and it's kernel fail to output to GPU. I've been managed to enter the password (at black screen) and system boots and works except display functioning.

Note: using kernel '5.16.x', because '5.10.x' does not work for this system.

marmarek commented 2 years ago

Can you attach a kernel log of such non working startup? Since the system otherwise starts, you should be able to extract it using journalctl (use -b -1 flag for example, to get logs from previous boot). Good + bad Xen log would be useful too, you can get it from /var/log/xen/console/hypervisor.log.

fiddler-on-the-roof commented 2 years ago

Sorry, the issue was not so critical for me (at that moment). Just now I have tested all current combinations of BIOS options and see kernels booting OK. Thanks for attention.