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)
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https://bugs.launchpad.net/bugs/1831587
Title:
brightness control not work with OLED panel
Status in HWE Next:
New
Status in OEM Priority Project:
New
Status in linux package in Ubuntu:
Triaged
Bug description:
image: disco 19.04
kernel: 5.0.0-15-generic
also verified failed on linux-image-unsigned-5.2.0-050200rc2-generic
also refer to :
-
https://askubuntu.com/questions/824949/lenovo-thinkpad-x1-yoga-oled-brightness
- https://bugs.freedesktop.org/show_bug.cgi?id=97883
Linux can not control the brightness on the OLED panel in the traditional way
[1].
Although there's a workaround from the community [2] that to execute script
while brightness hotkey event is triggered. But if we want to upstream it, it's
still a problem to recognize the OLED panel so that the system knows when to go
workaround.
- EDID of my laptop which has OLED: https://paste.ubuntu.com/p/w7rVqJTYDy/
- EDID of the same model without OLED: https://paste.ubuntu.com/p/P3ChhX9yBJ/
there's a kernel patch related OLED for reference:
- https://patchwork.kernel.org/patch/6133471/
[1] https://wiki.ubuntu.com/Kernel/Debugging/Backlight
[2]
https://askubuntu.com/questions/824949/lenovo-thinkpad-x1-yoga-oled-brightness
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