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
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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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