[Bug 1831587] Re: brightness control not work with OLED panel
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 have modified the above script to work with multiple monitors, and to
change the brightness whenever a discrepancy between the desired and
actual brightnesses of all monitors is detected. The script assumes that
the internal laptop monitor's brightness is the only one to be changed
by brightness keys, and that the laptop's monitor is the first monitor
listed in the command `xrandr --listmonitors`.
Please reply if you have any issues with this script, as I do want to
improve this.
#!/bin/bash
#-
# /usr/local/bin/brightness
# be sure this file is executable
#-
# Define a function which finds luminance values in default Ubuntu
# location, converts into a factor of maximum brightness
# Get the max brightness for reference.
# Get it to 2 decimal places
backlight_path=/sys/class/backlight/intel_backlight
read -r max < "$backlight_path"/max_brightness
luminance() {
read -r level < "$backlight_path"/actual_brightness
printf "%.2f" $(bc <<< "scale=10;$level/$max")
}
# Set up infinite loop
while true
do
# Get the current brightness levels from xrandr. Store in array
mapfile \
-t xrandrbrightness \
< <(xrandr --verbose --current \
| grep Brightness \
| sed 's/.* //' \
| xargs printf "%.2f\n")
# Get list of monitors and store in array
mapfile \
-t monitors \
< <(xrandr --listmonitors --current \
| grep -v 'Monitors' \
| awk '{print $4}')
# If the current brightness for monitor 0 != the desired value +/-0.01
if (( $(echo "${xrandrbrightness[0]} != $(luminance)" | bc -l) ))
then
# Set the brightness of the laptop monitor to the desired value
echo "${monitors[0]} Current:${xrandrbrightness[0]}
Desired:$(luminance)"
xrandr --output "${monitors[0]}" --brightness "$(luminance)"
fi
# Go through the rest of the monitors in the list
for (( i=1; i<${#monitors[@]}; i++ ))
do
# Change the brightness of external monitors to 1 if they aren't
if (( $(echo "${xrandrbrightness[$i]} != 1.00" | bc -l) ))
then
echo "${monitors[$i]} Current:${xrandrbrightness[$i]}"
xrandr --output "${monitors[$i]}" --brightness 1
fi
done
# Check every 100ms
sleep 0.1
done
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Title:
brightness control not work with OLED panel
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[Bug 1831587] Re: brightness control not work with OLED panel
** Tags added: oem-priority -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
@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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
20.04 should fix this issue. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
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 correctly on OLED displays? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
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
#-
backlight_path=/sys/class/backlight/intel_backlight
luminance() {
read -r level < "$backlight_path"/actual_brightness
bc <<< "scale=10;$level/$max"
}
devices() {
xrandr | grep -w connected | awk '{ print $1 }'
}
apply() {
for device in $(devices)
do
echo "$device" "$1"
xrandr --output "$device" --brightness "$1"
done
}
read -r max < "$backlight_path"/max_brightness
apply "$(luminance)"
inotifywait -me modify --format '' "$backlight_path"/actual_brightness | while
read; do
apply "$(luminance)"
done
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https://bugs.launchpad.net/bugs/1831587
Title:
brightness control not work with OLED panel
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[Bug 1831587] Re: brightness control not work with OLED panel
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 luminance value
write them to xrandr.
Here's a slight improvement to the suggested script:
#!/bin/bash
#-
# /usr/local/bin/brightness
# be sure this file is executable
#-
backlight_path=/sys/class/backlight/intel_backlight
device=`xrandr | grep -w connected | awk '{ print $1 }'`
luminance() {
read -r level < "$backlight_path"/actual_brightness
bc <<< "scale=10;$level/$max"
}
read -r max < "$backlight_path"/max_brightness
xrandr --output "$device" --brightness "$(luminance)"
inotifywait -me modify --format '' "$backlight_path"/actual_brightness | while
read; do
echo "$device" $(luminance)
xrandr --output "$device" --brightness "$(luminance)"
done
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https://bugs.launchpad.net/bugs/1831587
Title:
brightness control not work with OLED panel
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[Bug 1831587] Re: brightness control not work with OLED panel
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 cm x 19 cm Gamma: 2.20 Supported color formats: RGB 4:4:4 First detailed timing includes the native pixel format and preferred refresh rate Display x,y Chromaticity: Red: 0.6845, 0.3125 Green: 0.2431, 0.7070 Blue: 0.1386, 0.0546 White: 0.3125, 0.3291 Established timings supported: Standard timings supported: Detailed mode: Clock 573.410 MHz, 344 mm x 194 mm 3840 3888 3920 4400 hborder 0 2160 2164 2168 2172 vborder 0 +hsync -vsync VertFreq: 60 Hz, HorFreq: 130320 Hz Detailed mode: Clock 573.410 MHz, 344 mm x 194 mm 3840 3888 3920 4400 hborder 0 2160 2164 2168 2172 vborder 0 +hsync -vsync VertFreq: 60 Hz, HorFreq: 130320 Hz ASCII string: 0HHFM Manufacturer-specified data, tag 0 Has 1 extension blocks Checksum: 0xc0 (valid) CTA extension block Extension version: 3 11 bytes of CTA data Extended tag: Colorimetry data block BT2020RGB Extended tag: HDR static metadata data block Electro optical transfer functions: Traditional gamma - SDR luminance range SMPTE ST2084 Supported static metadata descriptors: Static metadata type 1 Desired content max luminance: 115 (603.666 cd/m^2) Desired content max frame-average luminance: 109 (530.095 cd/m^2) Desired content min luminance: 208 (4.016 cd/m^2) 0 native detailed modes Checksum: 0xe2 (valid) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
Nicolas, For your OLED issue on ThinkPad X1 extreme (gen 2), we are following up in bug 1844798. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
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 version: 01 04 basic params:b5 22 13 78 02 chroma info: 94 91 ae 51 3e b7 24 0b 50 54 established: 00 00 00 standard:01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 descriptor 1:f0 d4 00 40 f1 70 18 80 30 20 44 00 58 c2 10 00 00 1b descriptor 2:f0 d4 00 40 f1 70 18 80 30 20 44 00 58 c2 10 00 00 1b descriptor 3:00 00 00 0f 00 ff 09 3c ff 09 3c 2c 80 00 00 00 00 00 descriptor 4:00 00 00 fe 00 41 54 4e 41 35 36 57 52 30 38 2d 30 20 extensions: 01 checksum:15 Manufacturer: SDC Model 4141 Serial Number 0 Made week 19 of 2019 EDID version: 1.4 Digital display 10 bits per primary color channel DisplayPort interface Maximum image size: 34 cm x 19 cm Gamma: 2.20 Supported color formats: RGB 4:4:4 First detailed timing is preferred timing Established timings supported: Standard timings supported: Detailed mode: Clock 545.120 MHz, 344 mm x 194 mm 3840 3888 3920 4160 hborder 0 2160 2164 2168 2184 vborder 0 +hsync -vsync Detailed mode: Clock 545.120 MHz, 344 mm x 194 mm 3840 3888 3920 4160 hborder 0 2160 2164 2168 2184 vborder 0 +hsync -vsync Manufacturer-specified data, tag 15 ASCII string: ATNA56WR08-0 Has 1 extension blocks Checksum: 0x15 (valid) CEA extension block Extension version: 3 11 bytes of CEA data Extended tag: Colorimetry data block xvYCC601 xvYCC709 sYCC601 AdobeYCC601 AdobeRGB BT2020cYCC BT2020YCC BT2020RGB Extended tag: HDR static metadata data block Electro optical transfer functions: Traditional gamma - SDR luminance range Traditional gamma - HDR luminance range SMPTE ST2084 Supported static metadata descriptors: Static metadata type 1 Desired content max luminance: 115 Desired content max frame-average luminance: 109 Desired content min luminance: 7 0 native detailed modes Checksum: 0xab (valid) EDID block does NOT conform to EDID 1.3! Missing name descriptor Missing monitor ranges Detailed block string not properly terminated -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
** Changed in: linux (Ubuntu) Assignee: Kai-Heng Feng (kaihengfeng) => (unassigned) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
** Tags added: cscc -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: Incomplete => Triaged ** Tags added: somerville -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
** Changed in: linux (Ubuntu) Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1831587] Re: brightness control not work with OLED panel
** Tags added: originate-from-1829985 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831587 Title: brightness control not work with OLED panel To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1831587/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
