Ubuntu
linux-hwe package

[i915] framebuffer console flickers on 5.0.0 kernel

Bug #1838979 reported by Mathias Leyendecker
24
This bug affects 3 people
Affects Status Importance Assigned to Milestone
linux-hwe (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

Since upgrading to kernel 5.0.0-23-generic, the framebuffer tty is unusable due to flickering like crazy, showing green rectangles instead of a console. X.Org and Plymouth still display correctly.

In addition, the following message appears in dmesg:
[ 9191.868497] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 9687.876764] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

My GPU is Intel UHD Graphics 620.

The problem does not occur on the 4.18.0-25-generic kernel, which implies this might be a problem with the kernel, or the i915 module.

Description: Ubuntu 18.04.2 LTS
Release: 18.04

Architecture: amd64

linux-generic-hwe-18.04 version 5.0.0.23.80

In case this is relevant:
xserver-xorg-video-intel-hwe-18.04 version 2:2.99.917+git20171229-1ubuntu1~18.04.1
xserver-xorg-video-fbdev-hwe-18.04 version 1:0.5.0-1ubuntu1~18.04.1

See original description
Mathias Leyendecker (mleyen)
description: updated
Revision history for this message
lotuspsychje (lotuspsychje) wrote :

Thank you for making ubuntu better!

To file bugs please use ubuntu-bug packagename in the future so relevant info collects
into your bug and developers can debug more easy that way.

In this stage you can still collect the info with: apport-collect bugID

Could you please also add the model/type of your computer in your bug description?

Revision history for this message
Mathias Leyendecker (mleyen) wrote :

apport-collect did not create anything meaningful (exited with "Package linux-hwe not installed and no hook available, ignoring"), but I ran a few commands (including dmesg) to try to include a more complete report.
Please let me know if you need anything else.

My computer is the Clevo N750WU (laptop).

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in linux-hwe (Ubuntu):
status: New → Confirmed
Revision history for this message
lotuspsychje (lotuspsychje) wrote :

Thank you for providing more info, do you have the bug only on tty
or also on the desktop after 3 sec?

Revision history for this message
Kai-Heng Feng (kaihengfeng) wrote :

Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.3-rc3/

Revision history for this message
lotuspsychje (lotuspsychje) wrote :

See also bug: https://bugs.launchpad.net/ubuntu/+source/linux-hwe/+bug/1838644

Revision history for this message
Mathias Leyendecker (mleyen) wrote :

>do you have the bug only on tty
>or also on the desktop after 3 sec?

Only on tty, although the flickering briefly happens during boot and shutdown, as Plymouth briefly switches to text mode before LightDM is loaded. I do not know whether Plymouth itself is affected because it's so quick anyway.

As I said in the OP, X.Org itself is not affected.

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