https://bugs.kde.org/show_bug.cgi?id=510483
Bug ID: 510483
Summary: External HDMI dock monitor dims to 30% brightness and
can't be recovered
Classification: Plasma
Product: plasmashell
Version First 6.4.5
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: 1.0
SUMMARY
Every now and then, KDE Plasma decideds to dim my external monitor brightness
to 30% even if I'm in the middle of typing--which would normally be no big deal
except ...
ddcutil cannot detect my external HDMI monitor connected to my Thunderbolt
Dock. Consequently, the only way for me to undo the dimming is to use the
controls on the monitor itself.
KDE is somehow sending a DDC command to set my external dock HDMI monitor
brightness in spite of the fact that ddcutil can't actually detect it.
STEPS TO REPRODUCE
1. Work for a while
2. Monitor will dim to 30%
3. Monitor can't be reset except with physical monitor controls
OBSERVED RESULT
30% brightness setting not adjustable from KDE
EXPECTED RESULT
Preferably, no dimming, but at least the ability to reset brightness without
using physical monitor controls.
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.10-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × 13th Gen Intel® Core™ i7-1355U
Memory: 32 GiB of RAM (31.0 GiB usable)
Graphics Processor: Intel® Iris® Xe Graphics
Hardware:
Processors: 12 × 13th Gen Intel® Core™ i7-1355U
Memory: 32 GiB of RAM (31.0 GiB usable)
Graphics Processor: Intel® Iris® Xe Graphics
Manufacturer: LENOVO
Product Name: 21HMCTO1WW
System Version: ThinkPad X1 Carbon Gen 11
Lenovo Universal Thunderbolt 4 Dock
ADDITIONAL INFORMATION
```% ddcutil --version
ddcutil 2.2.1```
```% ddcutil detect
Invalid display
I2C bus: /dev/i2c-10
DRM_connector: card1-eDP-1
EDID synopsis:
Mfg id: SDC - UNK
Model:
Product code: 16787 (0x4193)
Serial number:
Binary serial number: 0 (0x00000000)
Manufacture year: 2020, Week: 35
This is a laptop display. Laptop displays do not support DDC/CI.```
EDID:
# card1-DP-6 #######################
Block 0, Base EDID:
EDID Structure Version & Revision: 1.3
Vendor & Product Identification:
Manufacturer: GSM
Model: 30543
Serial Number: 496572 (0x000793bc)
Made in: week 8 of 2020
Basic Display Parameters & Features:
Digital display
Maximum image size: 70 cm x 40 cm
Gamma: 2.20
DPMS levels: Standby Suspend Off
RGB color display
First detailed timing is the preferred timing
Color Characteristics:
Red : 0.6806, 0.3115
Green: 0.2675, 0.6630
Blue : 0.1503, 0.0488
White: 0.3125, 0.3291
Established Timings I & II:
DMT 0x04: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz
DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz
Standard Timings:
DMT 0x52: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz
DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz
DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz
Detailed Timing Descriptors:
DTD 1: 3840x2160 60.000000 Hz 16:9 135.000 kHz 594.000000 MHz
(697 mm x 392 mm)
Hfront 176 Hsync 88 Hback 296 Hpol P
Vfront 8 Vsync 10 Vback 72 Vpol P
Display Range Limits:
Monitor ranges (GTF): 40-60 Hz V, 30-135 kHz H, max dotclock 600 MHz
Display Product Name: 'LG HDR 4K'
Display Product Serial Number: '008NTJJEL572'
Extension blocks: 1
Checksum: 0x08
----------------
Block 1, CTA-861 Extension Block:
Revision: 3
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
Native detailed modes: 2
Audio Data Block:
Linear PCM:
Max channels: 2
Supported sample rates (kHz): 48 44.1 32
Supported sample sizes (bits): 24 20 16
Speaker Allocation Data Block:
FL/FR - Front Left/Right
Video Data Block:
VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
VIC 3: 720x480 59.940060 Hz 16:9 31.469 kHz 27.000000 MHz
VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
VIC 16: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz
VIC 18: 720x576 50.000000 Hz 16:9 31.250 kHz 27.000000 MHz
VIC 31: 1920x1080 50.000000 Hz 16:9 56.250 kHz 148.500000 MHz
VIC 32: 1920x1080 24.000000 Hz 16:9 27.000 kHz 74.250000 MHz
VIC 34: 1920x1080 30.000000 Hz 16:9 33.750 kHz 74.250000 MHz
VIC 97: 3840x2160 60.000000 Hz 16:9 135.000 kHz 594.000000 MHz
VIC 96: 3840x2160 50.000000 Hz 16:9 112.500 kHz 594.000000 MHz
VIC 95: 3840x2160 30.000000 Hz 16:9 67.500 kHz 297.000000 MHz
VIC 94: 3840x2160 25.000000 Hz 16:9 56.250 kHz 297.000000 MHz
VIC 93: 3840x2160 24.000000 Hz 16:9 54.000 kHz 297.000000 MHz
YCbCr 4:2:0 Capability Map Data Block:
VIC 97: 3840x2160 60.000000 Hz 16:9 135.000 kHz 594.000000 MHz
VIC 96: 3840x2160 50.000000 Hz 16:9 112.500 kHz 594.000000 MHz
Video Capability Data Block:
YCbCr quantization: No Data
RGB quantization: Selectable (via AVI Q)
PT scan behavior: Always Underscanned
IT scan behavior: Always Underscanned
CE scan behavior: Always Underscanned
Colorimetry Data Block:
BT2020YCC
BT2020RGB
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: 89 (343.724 cd/m^2)
Desired content max frame-average luminance: 89 (343.724 cd/m^2)
Desired content min luminance: 82 (0.355 cd/m^2)
Detailed Timing Descriptors:
DTD 2: 3840x2160 30.000000 Hz 16:9 67.500 kHz 297.000000 MHz
(697 mm x 392 mm)
Hfront 176 Hsync 88 Hback 296 Hpol P
Vfront 8 Vsync 10 Vback 72 Vpol P
DTD 3: 2560x1440 59.950550 Hz 16:9 88.787 kHz 241.500000 MHz
(697 mm x 392 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol N
DTD 4: 1920x1080 59.933878 Hz 16:9 66.587 kHz 138.500000 MHz
(697 mm x 392 mm)
Hfront 42 Hsync 38 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 23 Vpol N
Checksum: 0x19
----------------
Failures:
Block 1, CTA-861 Extension Block:
Video Capability Data Block: IT video formats are always underscanned, but
bit 7 of Byte 3 of the CTA-861 Extension header is set to overscanned.
EDID conformity: FAIL
# card1-eDP-1 #######################
Block 0, Base EDID:
EDID Structure Version & Revision: 1.4
Vendor & Product Identification:
Manufacturer: SDC
Model: 16787
Made in: week 35 of 2020
Basic Display Parameters & Features:
Digital display
Bits per primary color channel: 10
DisplayPort interface
Maximum image size: 30 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
Color Characteristics:
Red : 0.6796, 0.3203
Green: 0.2373, 0.7226
Blue : 0.1396, 0.0498
White: 0.3125, 0.3291
Established Timings I & II: none
Standard Timings: none
Detailed Timing Descriptors:
DTD 1: 2880x1800 90.001438 Hz 16:10 169.203 kHz 500.840000 MHz
(302 mm x 189 mm)
Hfront 8 Hsync 32 Hback 40 Hpol P
Vfront 8 Vsync 8 Vback 64 Vpol N
DTD 2: 2880x1800 60.000958 Hz 16:10 169.203 kHz 500.840000 MHz
(302 mm x 189 mm)
Hfront 8 Hsync 32 Hback 40 Hpol P
Vfront 8 Vsync 8 Vback 1004 Vpol N
Alphanumeric Data String: 'ATNA40YK15-0 '
Extension blocks: 1
Checksum: 0x62
----------------
Block 1, CTA-861 Extension Block:
Revision: 3
Native detailed modes: 0
Colorimetry Data Block:
BT2020RGB
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: 116 (616.884 cd/m^2)
Desired content max frame-average luminance: 96 (400.000 cd/m^2)
Desired content min luminance: 7 (0.005 cd/m^2)
Checksum: 0xb7
----------------
EDID conformity: PASS
--
You are receiving this mail because:
You are watching all bug changes.
