Public bug reported:
I have an X220 connected to a dock and via HDMI to an external monitor
running bionic. I noticed that anytime that I came back to the machine
from a screensaver both displays would flicker hard in certain areas of
the screen. The "fix" is to click the affected areas and then the
flickering goes away. I believe the X230 I also have is not affected in
the same dock but my memory might be wrong here.
Most importantly, I was able to verify that this problem is not present
in mainline kernel "5.2.0-999-generic #201905312204 SMP Sat Jun 1
02:07:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux"
$ sudo lshw -c display
*-display
description: VGA compatible controller
product: 2nd Generation Core Processor Family Integrated Graphics
Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:34 memory:f0000000-f03fffff memory:e0000000-efffffff
ioport:5000(size=64) memory:c0000-dffff
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: bionic kernel-fixed-upstream
** Tags added: kernel-fixed-upstream
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1834222
Title:
[i915] flickering after waking up from screensaver (fixed in mainline)
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