When using multiple monitors, and disconnecting and reconnecting them, I
noticed that Ubuntu 20.04 likes to set the external monitor's brightness
to 0.06, and the laptop's brightness to maximum. This is done without
changing the file at
(/sys/class/backlight/intel_backlight/actual_brightness).
I
** Tags added: oem-priority
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Title:
brightness control not work with OLED panel
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@Adam, Egbert
What kernel version are you using? I'd expect 5.4 in Focal or Bionic should
have already fixed this issue.
** Changed in: linux (Ubuntu)
Status: Triaged => Incomplete
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20.04 should fix this issue.
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Title:
brightness control not work with OLED panel
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Same here on a Dell XPS 7590 with OLED display, same as @rojer9 in #4.
The script above in #6 works, combine with the autostart .desktop file
from Archlinux wiki. Any chance of this either becoming automated in the
setup or having the relevant kernel modules adjusted to adjust the
brightness
An even better script so that all connected displays have their
brightness adjusted
#!/bin/bash
#-
# /usr/local/bin/brightness
# be sure this file is executable
#-
There does appear to be a work around here:
https://wiki.archlinux.org/index.php/HP_Spectre_x360_13-4231ng#Brightness_/_backlight
It requires bc and inotify-tools.
The workaround is for a long running program to listen for changes to
/sys/class/backlight/intel_backlight
calculate the right
Anthony, what about the following panel (used on OLED Dell XPS 15):
$ edid-decode /sys/class/drm/card0-eDP-1/edid
EDID version: 1.4
Manufacturer: SDC Model a029 Serial Number 0
Made in week 10 of 2019
Digital display
10 bits per primary color channel
DisplayPort interface
Maximum image size: 34
Nicolas,
For your OLED issue on ThinkPad X1 extreme (gen 2), we are following up
in bug 1844798.
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Title:
brightness control not work with OLED
Same issue for me on an ThinkPad X1 extreme (gen 2),
EDID info:
# edid-decode /sys/class/drm/card0-eDP-1/edid
[09:29:37]
Extracted contents:
header: 00 ff ff ff ff ff ff 00
serial number: 4c 83 41 41 00 00 00 00 13 1d
** Changed in: linux (Ubuntu)
Assignee: Kai-Heng Feng (kaihengfeng) => (unassigned)
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Title:
brightness control not work with OLED panel
To
** Tags added: cscc
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Title:
brightness control not work with OLED panel
To manage notifications about this bug go to:
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
** Tags added: somerville
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** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng)
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Title:
brightness control not work with OLED panel
To
** Tags added: originate-from-1829985
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Title:
brightness control not work with OLED panel
To manage notifications about this bug go to:
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