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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https://bugs.launchpad.net/bugs/1872452
Title:
[amdgpu] Boot into black screen without power
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
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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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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** Summary changed:
- [amdgpu] Boot into black screen without power supply (Kubuntu on AMD /
Thinkpad T495)
+ [amdgpu] Boot into black screen without power supply (Kubuntu on AMD)
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: kwin (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpa
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
Status: New => Confirmed
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This affects me too - Ubuntu MATE 20.04, Lenovo T495 (so AMD
graphics/amdgpu).
Boots fine with power supply connected, but running from battery, laptop
POSTs ok, displays grub, displays boot msgs but then screen goes blank.
Happy to provide logs if you let me know what you need, I can SSH into
the
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
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
and crash file.
** Attachment added: "_usr_bin_konsole.1000.crash"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1872452/+attachment/5354082/+files/_usr_bin_konsole.1000.crash
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