Hi,
I had problem with my brightness too that I couldn’t find the brightness slider in system settings at all. It turns out that I have to change brightness in Intel HD Graphics Control Panel.
The Intel® Graphics Control Panel is no longer included in the driver installer with Windows Declarative Componentized Hardware (DCH) Graphics drivers and needs to be downloaded and installed separately from the Microsoft Store.
But I think you can also use function keys to change brightness.
If Intel HD Graphics Control Panel doesn't help, as Intel suggested, we could try OEM drivers.
OEM drivers are handpicked, customized, and validated to resolve platform-specific issues, enable features and enhancements, and improve system stability. Intel’s generic graphics drivers are intended for testing, and we recommend using drivers from OEM. Report any issues found with this driver to Intel.
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