Flickering display brightness when maxing out brightness

[Dennis Salvador Ignacio]

Affected version

Your OS and version: Ubuntu 19.10
Affected GNOME Shell version: 3.34.2
Does this issue appear in XOrg and/or Wayland: Haven't tried on Wayland.

Bug summary
When the slider for the brightness is dragged to the far right (maxed out), there seems to be flickering a few seconds later. The delay time somewhat varies, sometimes 5 seconds later, sometimes 30 seconds later. When a power source is plugged-in, the flickering seems to stop, then the flickering continues. When the power source is removed, the flickering also stops, then continues later again.

Steps to reproduce

Power-on computer.
Max out brightness slider.

What happened
Display brightness is flickering.

What did you expect to happen
Display brightness should not flicker.

Relevant logs, screenshots, screencasts etc.

System info:

uname -a
Linux linux 5.3.0-40-generic #32-Ubuntu SMP Fri Jan 31 20:24:34 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

sudo lshw -c video
*-display
description: Display controller
product: Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: d1
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi bus_master cap_list rom
configuration: driver=amdgpu latency=0
resources: irq:62 memory:d0000000-dfffffff memory:e0000000-e01fffff ioport:3000(size=256) memory:e0a00000-e0a3ffff memory:e0a40000-e0a5ffff
*-display
description: VGA compatible controller
product: Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:04:00.0
version: c4
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi msix vga_controller bus_master cap_list
configuration: driver=amdgpu latency=0
resources: irq:63 memory:b0000000-bfffffff memory:c0000000-c01fffff ioport:1000(size=256) memory:e0800000-e087ffff

Hardware: Ryzen 5 2500u, Radeon 535, 16GB DDR4-2400 Dual Channel, 1TB HDD, Acer Aspire A315-41G-R4BW

neofetch
.-/+oossssoo+/-. sky@linux
:+ssssssssssssssssss+: ---------
-+ssssssssssssssssssyyssss+- OS: Ubuntu 19.10 x86_64
.ossssssssssssssssssdMMMNysssso. Host: Aspire A315-41G V1.15
/ssssssssssshdmmNNmmyNMMMMhssssss/ Kernel: 5.3.0-40-generic
+ssssssssshmydMMMMMMMNddddyssssssss+ Uptime: 3 hours, 11 mins
/sssssssshNMMMyhhyyyyhmNMMMNhssssssss/ Packages: 1741 (dpkg), 8 (snap)
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Shell: bash 5.0.3
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ Resolution: 1920x1080
ossyNMMMNyMMhsssssssssssssshmmmhssssssso DE: GNOME 3.34.1
ossyNMMMNyMMhsssssssssssssshmmmhssssssso WM: GNOME Shell
+sssshhhyNMMNyssssssssssssyNMMMysssssss+ WM Theme: Adwaita
.ssssssssdMMMNhsssssssssshNMMMdssssssss. Theme: Yaru [GTK2/3]
/sssssssshNMMMyhhyyyyhdNMMMNhssssssss/ Icons: Papirus [GTK2/3]
+sssssssssdmydMMMMMMMMddddyssssssss+ Terminal: gnome-terminal
/ssssssssssshdmNNNNmyNMMMMhssssss/ CPU: AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx (8) @ 2.000GHz
.ossssssssssssssssssdMMMNysssso. GPU: AMD ATI Radeon Vega Series / Radeon Vega Mobile Series
-+sssssssssssssssssyyyssss+- GPU: AMD ATI Radeon R7 M260/M265 / M340/M360 / M440/M445
:+ssssssssssssssssss+: Memory: 6091MiB / 14967MiB
.-/+oossssoo+/-.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-40-generic 5.3.0-40.32
ProcVersionSignature: Ubuntu 5.3.0-40.32-generic 5.3.18
Uname: Linux 5.3.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: sky 1421 F.... pulseaudio
 /dev/snd/pcmC1D0p: sky 1421 F...m pulseaudio
 /dev/snd/controlC0: sky 1421 F.... pulseaudio
 /dev/snd/timer: sky 1421 f.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 16 18:01:52 2020
InstallationDate: Installed on 2020-03-12 (4 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: Acer Aspire A315-41G
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-40-generic root=UUID=559e1aaf-94d9-4a1e-b82a-a1b45b793c0b ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.3.0-40-generic N/A
 linux-backports-modules-5.3.0-40-generic N/A
 linux-firmware 1.183.4
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/20/2019
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.15
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Metapod_RR
dmi.board.vendor: RR
dmi.board.version: V1.15
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.15
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.15:bd06/20/2019:svnAcer:pnAspireA315-41G:pvrV1.15:rvnRR:rnMetapod_RR:rvrV1.15:cvnAcer:ct10:cvrV1.15:
dmi.product.family: Aspire 3
dmi.product.name: Aspire A315-41G
dmi.product.sku: 0000000000000000
dmi.product.version: V1.15
dmi.sys.vendor: Acer

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.