Public bug reported:
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
** Affects: linux-hwe (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1838979
Title:
[i915] framebuffer console flickers on 5.0.0 kernel
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