Public bug reported:
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,
I removed "acpi_backlight=vendor" and didn't helped...
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Title:
Brightness key freeze screen
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I tried apt upgrade and bios update but didn't helped
$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic
root=UUID=c78b51e8-c664-4dd2-8020-7bc5da6f2bc0 ro quiet splash vt.handoff=7
** Attachment added: "dmesg.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891032/+att
$ ls /sys/class/backlight/
intel_backlight
** Attachment added: "acpi.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891032/+attachment/5401244/+files/acpi.log
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These 3 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)
And these 2 don't work (tee:
/sys/class/backlight/intel_
This command don't cause screen freeze:
echo 500 > /sys/class/backlight/intel_backlight/brightness
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1891032
Title:
Brightness key freeze screen
To mana
I can control the brightness (with step up or down) using these
commands:
gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path
/org/gnome/SettingsDaemon/Power --method
org.gnome.SettingsDaemon.Power.Screen.StepUp
gdbus call --session --dest org.gnome.SettingsDaemon.Power --obj
