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I am facing a weird problem in gnome startup. Gnome startup gets stuck (before login screen) on battery BUT not when my laptop is connected to power.

I am running ubuntu 18.04 on Thinkpad T495 (AMD ryzen 3500u pro). Recently upgraded to the latest 5.3 kernel (via bionic stable ppt).

Linux ThinkPad-T495 5.3.0-26-generic #28~18.04.1-Ubuntu SMP Wed Dec 18 16:40:14 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

I was checking the journalctl logs but I am not entirely sure what sort of errors I need to focus on.

Any help on this is much appreciated!

UPDATE:

This issue persists in ubuntu 20.04 as well.

And adding grub params iommu=soft solves this at least temporarily.

n1r44
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4 Answers4

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Same bug on pretty much every distro I could try, s340 with 3500u here. Is this a known issue for the devs?

Edit: adding grub params nomodeset or iommu=soft solves this (idk at what cost) but it is a good temporary fix

Gryu
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Gabriel Gonçalves
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Installed Kernel 5.5 according to this guide: http://ubuntuhandbook.org/index.php/2020/01/install-kernel-5-5-ubuntu/

Currently running 5.5.0-050500-generic which appears to resolve the issue. I am able to boot my laptop (T495/Ryzen) on battery now and did not see any other problems so far. USB works for me.

Only one error message remains in journalctl

[drm:dm_helpers_parse_edid_caps [amdgpu]] *ERROR* Couldn't read SADs: -2
Martin
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I disabled IOMMU in my bios and the laptop boots perfectly on battery now.

Zanna
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John Brandborg
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You can install the new 5.8 kernel with:

sudo apt install linux-generic-hwe-20.04-edge

be aware that this is official experimental kernel until they release the non-edge.

Xwayland edge still not out.

It will fix the problem, although I have another problem now with USB and BT suspending after a while.

Zanna
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Rudi
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