This bug is very old, if it is still an issue please update the bug with
information from a supported release.
** Changed in: kwin (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
Status: Confirmed => Incomplete
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You received this bug no
The iommu=soft workaround works for me. Without it my T495 was pretty
much useless with Ubuntu.
Here are some detailed instructions for mere mortals:
https://www.reddit.com/r/thinkpad/comments/eb08hk/t495_unplugged_battery_broken_boot_with_linux/
Does anybody know by chance when and how one can i
iommu=soft as workaround helped me (ThinkPad T495 / AMD)
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Bugs, which is subscribed to kwin in Ubuntu.
https://bugs.launchpad.net/bugs/1872452
Title:
[amdgpu] Boot into black screen without power supply (Kubuntu on AMD)
I noticed the same problems and a few more. For example closing the lid
hangs the system. Disconnecting the power supply hangs the system. All
clearly kernel related.
I tried the iommu=soft solution which didn't work for me. Also adding
amd_iommu=pt didn't help.
The best fix I found so far was up
I've managed to get the system to boot when not plugged into mains by
adding 'iommu=soft' to the linux line in grub.
Not sure at what cost but at least I don't lose my display info like
when nomodeset is used.
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Bugs, which
Just to provide a source, I got it from here (where it seems other
people have the same issue):
https://askubuntu.com/questions/1206472/ubuntu-18-04-and-20-04-stuck-on-
gnome-startup-on-battery-only
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Bugs, which is subscrib
Meanwhile after some updates I manage to login even without power
supply. After that the screen is distorted and looks like this - s.
attachment. In the screen you see right a shadow - my taskbar. You can
only see the top bar of windows.
** Attachment added: "IMG_20200414_230842.jpg"
https://b
I tested again. THis time I got the login screen and logged in then the screen
got distorted as the display manager would not work correctly. I did
"journalctl -b 0" and found also a crash file in var/crash/...
I attach both files here.
** Attachment added: "bootlog"
https://bugs.launchpad.n
