https://bugs.kde.org/show_bug.cgi?id=505236
Bug ID: 505236
Summary: Can't change screen brightness after resume on some
displays, only sometimes
Classification: Plasma
Product: plasmashell
Version First 6.3.5
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Brightness and Color widget
Assignee: plasma-b...@kde.org
Reporter: alvisebruni...@gmail.com
CC: natalie_clar...@yahoo.de
Target Milestone: 1.0
SUMMARY
Normally I would find two sliders (one for each monitor) in the brightness
applet to change monitor brightness.
When the display gets powered off (either after just locking or full sleep),
the slider for one of the display (always the same) is missing, while the other
works normally. Plugging, unplugging, powering off the displays, etc. does
nothing, but logging out and in from plasma fixes the issue.
The issue doesn't occur every time, but does occur.
The issue doesn't seem to occur if the display is connected over hdmi instead
of displayport, but I can confirm it doesn't always happen.
It is not a `ddc` issue as the `ddcutil` command still works
STEPS TO REPRODUCE
1. Have an "LG HDR WFHD" monitor connected via displayport
2. Suspend and resume
3. Check if the slider is still there
4. Retry until its not
OBSERVED RESULT
The slider is gone
EXPECTED RESULT
The slider should still be there
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.9-300.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7700X 8-Core Processor
Memory: 31.0 GiB of RAM
Graphics Processor: AMD Radeon RX Vega
ADDITIONAL INFORMATION
The output of `ddcutil detect` is
> Invalid display
> I2C bus: /dev/i2c-3
> DRM connector: card1-HDMI-A-1
> EDID synopsis:
> Mfg id: MST - MS Telematica
> Model: MStar Demo
> Product code: 48 (0x0030)
> Serial number:
> Binary serial number: 1 (0x00000001)
> Manufacture year: 2012, Week: 10
> DDC communication failed. (getvcp of feature x10 returned Error_Info[EIO
> in ddc_write_read_with_retry, causes: EIO])
>
> Display 1
> I2C bus: /dev/i2c-6
> DRM connector: card1-DP-3
> EDID synopsis:
> Mfg id: GSM - Goldstar Company Ltd (LG)
> Model: LG HDR WFHD
> Product code: 23456 (0x5ba0)
> Serial number:
> Binary serial number: 496642 (0x00079402)
> Manufacture year: 2021, Week: 2
> VCP version: 2.1
The problematic monitor is the second one (LG), but using the command `ddcutil
--model="LG HDR WFHD" setvcp 10 66` I can see that it's still working with ddc,
just the slider is missing.
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