https://bugs.kde.org/show_bug.cgi?id=507456
--- Comment #17 from Mauro <[email protected]> --- Follow-up: I found a working config-based workaround on Kubuntu 26.04 (ddcutil 2.2.6, Plasma 6.6.6). Note that my earlier statement that ddcutilrc tweaks "had no effect" was actually wrong: the options were silently rejected because I was using the pre-2.0 key = value syntax, which is invalid in ddcutil 2.2.x. With the correct 2.2.x syntax the options are applied. This ~/.config/ddcutil/ddcutilrc: [libddcutil] options : --skip-ddc-checks --disable-dynamic-sleep --sleep-multiplier 0.15 drops detection from ~12.4 s to 0.21 s: $ time ddcutil detect ddcutil detect 0,01s user 0,20s system 99% cpu 0,207 total Both DisplayPort monitors are still detected, and DDC brightness control from the Plasma "Brightness & Color" widget keeps working normally. The only visible side effect is VCP version: Detection failed in ddcutil detect output, which is cosmetic and caused by --skip-ddc-checks. So the default-config slowdown is clearly in libddcutil's probing of these DisplayPort monitors (the DDCRC_READ_ALL_ZERO retries on features 0xdd/0x41 with dynamic sleep). Disabling dynamic sleep and lowering the sleep multiplier sidesteps it entirely, which points again at ddcutil itself rather than powerdevil. -- You are receiving this mail because: You are watching all bug changes.
