SUMMARY KDE's brightness control is actually changing the black level of my displays (Fujitsu B24T-7). STEPS TO REPRODUCE 1. Hover mouse pointer over brightness widget 2. Scroll mouse wheel 3. ??? 4. Profit! OBSERVED RESULT Image is affected in a way that's hard to describe, like fading mostly to black, but at the same brightness. EXPECTED RESULT Backlight dims without affecting anything else. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.0.4 KDE Frameworks Version: 6.2.0 Qt Version: 6.7.0 Kernel Version: 6.6.31-1-lts (64-bit) Graphics Platform: Wayland Processors: 24 × Intel® Xeon® CPU E5-2690 v3 @ 2.60GHz Memory: 125.7 GiB of RAM Graphics Processor: NV117 Manufacturer: FUJITSU Product Name: CELSIUS M740 ADDITIONAL INFORMATION Output from `ddcui`: --- Display number: 1 I2C bus: /dev/i2c-0 Mfg Id: FUS Model: B24T-7 LED PG Product code: 2093 Serial number: YV6K040698 Binary serial number: 40698 (0x00009efa) EDID: +0 +4 +8 +c 0 4 8 c +0000 00 ff ff ff ff ff ff 00 1a b3 2d 08 fa 9e 00 00 ..........-..... +0010 10 18 01 03 80 35 1e 78 2a 0e c5 a5 55 50 9e 26 .....5.x*...UP.& +0020 12 50 54 a5 4b 00 81 c0 81 80 95 00 b3 00 d1 c0 .PT.K........... +0030 01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c .......:..q8-@X, +0040 45 00 13 2b 21 00 00 1e 00 00 00 fd 00 38 4c 1e E..+!........8L. +0050 52 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 42 R... .....B +0060 32 34 54 2d 37 20 4c 45 44 20 50 47 00 00 00 ff 24T-7 LED PG.... +0070 00 59 56 36 4b 30 34 30 36 39 38 0a 20 20 01 6a .YV6K040698. .j VCP Version: 2.2 --- Display number: 2 I2C bus: /dev/i2c-4 Mfg Id: FUS Model: B24T-7 LED PG Product code: 2093 Serial number: YV6K213876 Binary serial number: 213876 (0x00034374) EDID: +0 +4 +8 +c 0 4 8 c +0000 00 ff ff ff ff ff ff 00 1a b3 2d 08 74 43 03 00 ..........-.tC.. +0010 30 19 01 03 80 35 1e 78 2a 0e c5 a5 55 50 9e 26 0....5.x*...UP.& +0020 12 50 54 a5 4b 00 81 c0 81 80 95 00 b3 00 d1 c0 .PT.K........... +0030 01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c .......:..q8-@X, +0040 45 00 13 2b 21 00 00 1e 00 00 00 fd 00 38 4c 1e E..+!........8L. +0050 52 11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 42 R... .....B +0060 32 34 54 2d 37 20 4c 45 44 20 50 47 00 00 00 ff 24T-7 LED PG.... +0070 00 59 56 36 4b 32 31 33 38 37 36 0a 20 20 01 27 .YV6K213876. .' VCP Version: 2.2 ---
This sounds very strange. Possibly a monitor firmware issue or something. Could you maybe attach a phone video that shows the issue happening?
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Something like this was also reported here. https://github.com/xanderfrangos/twinkle-tray/issues/213 https://github.com/blackholeearth/Win10_BrightnessSlider/issues/60 Supposedly, at least Siemens and Fujitsu use 0x13 (backlight control) rather than 0x10 (brightness).
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!