0. install acpidbg - sudo apt install linux-tools-`uname -r` linux-
tools-generic
trigger and check which of the following cause screen freeze
1. sudo acpidbg -b "e EV5 1 0" ("2 0" for brightness down)
2. sudo acpidbg -b "e \_SB.PCI0.GFX0.BRT6 1 0" ("2 0" for brightness down)
3. sudo acpidbg -b "notify \_SB.PCI0.GFX0.LCD 0x86" (0x86 for brightness down)
4. echo 30000 | sudo tee /sys/class/backlight/intel_backlight/brightness
5. echo 60000 | sudo tee /sys/class/backlight/intel_backlight/brightness
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https://bugs.launchpad.net/bugs/1891032
Title:
Brightness key freeze screen
Status in linux package in Ubuntu:
Incomplete
Bug description:
When I press the KEY_BRIGHTNESSDOWN or KEY_BRIGHTNESSUP the screen
freeze for a few seconds.
Sometimes it up/down brightness to max/min with just one press and the
overlay get stuck in the screen.
Maybe useful information:
# evtest
Event: time 1597066500.752632, -------------- SYN_REPORT ------------
Event: time 1597066502.755372, type 4 (EV_MSC), code 4 (MSC_SCAN), value 86
Event: time 1597066502.755372, type 1 (EV_KEY), code 225 (KEY_BRIGHTNESSUP),
value 1
Event: time 1597066502.755372, -------------- SYN_REPORT ------------
Event: time 1597066502.761653, type 4 (EV_MSC), code 4 (MSC_SCAN), value 86
Event: time 1597066502.761653, type 1 (EV_KEY), code 225 (KEY_BRIGHTNESSUP),
value 0
Event: time 1597066502.761653, -------------- SYN_REPORT ------------
Event: time 1597066521.533682, type 4 (EV_MSC), code 4 (MSC_SCAN), value 85
Event: time 1597066521.533682, type 1 (EV_KEY), code 224
(KEY_BRIGHTNESSDOWN), value 1
Event: time 1597066521.533682, -------------- SYN_REPORT ------------
Event: time 1597066521.542973, type 4 (EV_MSC), code 4 (MSC_SCAN), value 85
Event: time 1597066521.542973, type 1 (EV_KEY), code 224
(KEY_BRIGHTNESSDOWN), value 0
$ lsb_release -rd
Description: Ubuntu 20.04.1 LTS
Release: 20.04
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: udev 245.4-4ubuntu3.2
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
CustomUdevRuleFiles: 70-snap.core.rules
Date: Mon Aug 10 10:44:20 2020
InstallationDate: Installed on 2018-07-23 (749 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: Dell Inc. Inspiron 5558
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic
root=UUID=c78b51e8-c664-4dd2-8020-7bc5da6f2bc0 ro quiet splash
acpi_backlight=vendor vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to focal on 2020-07-11 (29 days ago)
dmi.bios.date: 02/02/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 0R392V
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA15:bd02/02/2018:svnDellInc.:pnInspiron5558:pvr01:rvnDellInc.:rn0R392V:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Inspiron 5558
dmi.product.sku: Inspiron 5558
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
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