Created attachment 175099 [details] Video with frame rate drops with Night Light After update to plasma 6.2.1.1 and with night light I have frame rate drops.With plasma 6.2.0 no issue. STEPS TO REPRODUCE 1. Turn on "Night light" 2. Change the brightness OBSERVED RESULT The frame rate drops from 60 to 30 or from 120 to 40-50. EXPECTED RESULT No frame rate drops SOFTWARE/OS VERSIONS Operating System: Fedora Linux 40 KDE Plasma Version: 6.2.1 (6.2.1.1) KDE Frameworks Version: 6.7.0 Qt Version: 6.7.2 Kernel Version: 6.11.3-200.fc40.x86_64 (64-bit) Graphics Platform: Wayland Processors: 8 × 11th Gen Intel® Core™ i5-1135G7 @ 2.40GHz Memory: 38.9 GiB of RAM Graphics Processor: Mesa Intel® Xe Graphics Manufacturer: ASUSTeK COMPUTER INC. Product Name: ASUS EXPERTBOOK B1400CEAEY_B1400CEAE System Version: 1.0 ADDITIONAL INFORMATION 1. Connected to external monitor and have same issue 2. Used other ICC and have same issue 3. Created new user and have same issue
*** This bug has been marked as a duplicate of bug 480799 ***
oops, that was the wrong one. I didn't see the one I was actually thinking about, let's just track it here then.
When the brightness stays constant, is performance okay? > Used other ICC and have same issue Does it also happen without an ICC profile?
Intresting(In reply to Zamundaaa from comment #3) > When the brightness stays constant, is performance okay? > > > Used other ICC and have same issue > Does it also happen without an ICC profile? I have no issues with the ICC profile. I had previously only tried the built-in one. I upgraded to Plasma 6.2.2 and still see the same problem. There is no frame drop if you don't change the brightness. Here are the results with the ICC profile: So I have the following behavior: 1. Without ICC - No night mode - Brightness change - no frame drop 2. Without ICC - With night mode - Brightness change - frame drop 3. With built-in ICC - No night mode - Brightness change - No frame drop 4. With built-in ICC - With night mode - brightness change - frame drop 5. With any ICC - No night mode - Brightness change - No drop 6. With ICC sRGB - With night mode - Brightness change - no frame drop 7. With ICC AdobeRGB1998 - With night mode - Brightness change - no frame drop 8. With ICC Bluish - With night mode - Brightness change - no frame drop 9. With ICC Rec709 - With night mode - Brightness change - No frame drop 10. With ICC SMPTE-C-RGB - With night mode - Brightness change - no frame drop !!! 11. With ICC x11-colors.icc - With night mode - Brightness change - frame drop
Okay, I can confirm that there are some frame drops. It's not very pronounced here, but still measurable. It's almost certainly caused by calculating or by programming lookup tables - if you set an ICC profile that KWin successfully loads, then a shader is used instead, so it doesn't happen there.
I can also reproduce this issue on my device: Processors: 16 × AMD Ryzen 7 7840U w/ Radeon™ 780M Graphics Memory: 14.9 GB of RAM Graphics Processor: AMD Radeon 780M When I change the brightness via keyboard button during the night light transition period, it does not respond smoothly.
*** Bug 496316 has been marked as a duplicate of this bug. ***
I looked into this a bit more, and my theory was correct - it takes consistently less than 200µs to do a commit for normal presentation, but with LUT changes it takes 1-2ms instead, making KWin miss the deadline for the frame. I'm not sure if this is a bug in amdgpu or if it's just how long the hardware takes to respond, but either way we can improve the situation by measuring how much time we spend in the kernel and adjusting the safety margin accordingly.
Same experience on my system: Operating System: Fedora Linux 41 KDE Plasma Version: 6.2.4 KDE Frameworks Version: 6.9.0 Qt Version: 6.8.1 Kernel Version: 6.12.4-200.fc41.x86_64 (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 PRO 7840U w/ Radeon 780M Graphics Memory: 58.5 GiB of RAM Graphics Processor: AMD Radeon 780M
(In reply to Zamundaaa from comment #8) > I'm not sure if this is a bug in amdgpu This started to happen direclty after upgrading to 6.2 on laptops without any AMD graphics. Night Light cannot be used at all.
Right, yours is a different case, I shouldn't have marked that as a duplicate.
I also have this issue. Toggling Night light in the systray Brightness and color poppup, the kwin_wayland process is pegged at 100% during the transition. Plasma 6.2.5
Can reproduce regardless of ICC profile (none, ICC profile, built-in) Intel graphics.
*** Bug 453701 has been marked as a duplicate of this bug. ***
Duplicating previous comment from duplicate bug report Bug 453701 Still affected: kde: 6.3.2-1.fc41 system info: https://gist.github.com/vst-name/35f647cf2c9f02e41f6db1220a4c3236 ❯ cat /etc/os-release NAME="Aurora" VERSION="latest-41.20250304 (Kinoite)" RELEASE_TYPE=stable ID=aurora ID_LIKE="fedora" VERSION_ID=41 VERSION_CODENAME="" PLATFORM_ID="platform:f41" PRETTY_NAME="Aurora (Version: latest-41.20250304 / FROM Fedora Kinoite 41)" ANSI_COLOR="0;38;2;60;110;180" LOGO=fedora-logo-icon CPE_NAME="cpe:/o:universal-blue:aurora:41" DEFAULT_HOSTNAME="aurora" HOME_URL="https://getaurora.dev/" DOCUMENTATION_URL="https://docs.getaurora.dev" SUPPORT_URL="https://github.com/ublue-os/aurora/issues/" BUG_REPORT_URL="https://github.com/ublue-os/aurora/issues/" SUPPORT_END=2025-12-15 VARIANT="Kinoite" VARIANT_ID=aurora-dx-hwe-nvidia OSTREE_VERSION='latest-41.20250304' BUILD_ID="d0733e0" IMAGE_ID="aurora-dx-hwe-nvidia"
(In reply to Vladislav Stishenko from comment #15) > Duplicating previous comment from duplicate bug report Bug 453701 > Still affected: > kde: 6.3.2-1.fc41 > system info: > https://gist.github.com/vst-name/35f647cf2c9f02e41f6db1220a4c3236 > ❯ cat /etc/os-release > NAME="Aurora" > VERSION="latest-41.20250304 (Kinoite)" > RELEASE_TYPE=stable > ID=aurora > ID_LIKE="fedora" > VERSION_ID=41 > VERSION_CODENAME="" > PLATFORM_ID="platform:f41" > PRETTY_NAME="Aurora (Version: latest-41.20250304 / FROM Fedora Kinoite 41)" > ANSI_COLOR="0;38;2;60;110;180" > LOGO=fedora-logo-icon > CPE_NAME="cpe:/o:universal-blue:aurora:41" > DEFAULT_HOSTNAME="aurora" > HOME_URL="https://getaurora.dev/" > DOCUMENTATION_URL="https://docs.getaurora.dev" > SUPPORT_URL="https://github.com/ublue-os/aurora/issues/" > BUG_REPORT_URL="https://github.com/ublue-os/aurora/issues/" > SUPPORT_END=2025-12-15 > VARIANT="Kinoite" > VARIANT_ID=aurora-dx-hwe-nvidia > OSTREE_VERSION='latest-41.20250304' > BUILD_ID="d0733e0" > IMAGE_ID="aurora-dx-hwe-nvidia" Though for me the bug(lag, low fps) only appears with fast switching of night light: - suspend night light - switching via - always on/off via settings KDE is rendering on intel built-in GPU (Iris Xe Graphics) With ICC: None - it still lags under condition above, but less noticeable Same with RGB Range: limited/full
It appears to me that the same symptom (high CPU usage) is present when changing brightness on a laptop when external monitor is connected - which very newly also dims the external monitor image signal, also by modifying LUT I assume.