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When the system resumes from sleep mode, the screen brightness automatically adjusts to 100%.
When the computer wakes up from sleep mode, the screen brightness automatically sets to 100%, even if it had previously been adjusted to a lower level.
You have to manually lower the brightness every time it wakes up; attempting to adjust the brightness settings in Power Options does not resolve the issue. This problem is relatively common on laptops.
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Hi — that is commonly caused by the graphics/ACPI power driver or the laptop maker’s display utility restoring its own brightness value after resume.
Install the OEM graphics, chipset, and BIOS updates for the exact laptop model. Then temporarily disable adaptive brightness/content-adaptive brightness and any Intel/AMD display power-saving option, and test with the manufacturer’s power utility removed from Startup. Resetting the active power plan to its defaults can also clear a bad saved value.
If it still happens, create a second local Windows profile and test sleep/resume there. A profile-only result suggests a user setting; the same behavior in BIOS diagnostics or every profile points to firmware/driver control. What laptop model and graphics adapter are involved?
