https://bugs.kde.org/show_bug.cgi?id=488935
Bug ID: 488935
Summary: Adjusting Power Profile Affects Display Colours
Classification: Plasma
Product: plasmashell
Version: 6.1.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Battery Monitor
Assignee: plasma-b...@kde.org
Reporter: eamonn...@protonmail.com
CC: k...@privat.broulik.de, m...@ratijas.tk,
natalie_clar...@yahoo.de
Target Milestone: 1.0
SUMMARY
I couldn't find much information on this so I assume it is a specific bug and
perhaps not intended, but if it is intended and I am being silly, feel free to
close!
When changing the CPU power profile in the Power Management widget, the display
colours change. They will become much more washed out at Powersave, but look
normal at Balanced and Performance (the display seems brighter at Performance,
but that's it).
I am aware that some systems allow you to toggle a display power profile and a
CPU power profile, but I have not seen them grouped together. I also don't
recall this happening on an old laptop I had where I changed the CPU
performance governor manually. It also does not happen on my Desktop PC, or if
it does, it is not noticeable. But this may be specific to a laptop power
profile - or this laptop's power profile, as I could not see information online
about this behaviour.
The closest I could think of is that the power profile affects how much power
the screen could be getting? But even on other devices where you can set a TDP
limit, such as the Steam Deck, the screen colours are never affected in this
way.
I am using a Framework 16 laptop.
This could very well be intended behaviour, but I couldn't find information
about changing the Power Profile affecting display colours. This problem could
also be an OS configuration issue and not something on the KDE side.
I noticed this because I was keeping my laptop in Power Save, and when I opened
some YouTube videos, the video quality was noticeably poor (like poor exposure
or something).
STEPS TO REPRODUCE
1. Adjust Performance Profile from a higher value to a lower value (naming and
options may be different depending on the CPU)
2. Display colours will become washed out.
3. Turn the Performance Profile back up.
4. The colours will look normal.
OBSERVED RESULT
Display colours become washed out when turning the Power Profile down.
EXPECTED RESULT
Power profile should not impact the screen, or if it is intended, there should
be an option to tweak this (perhaps a separate option under Displays for this?)
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.9.5 Linux Zen
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
ADDITIONAL INFORMATION
I did not notice if this happened on Plasma 6.0.5.
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