Switching to generic PnP monitor restored the brightness, and the brightness stayed up when I re-installed the graphics driver. The second time it happened, I had to fully unistall the graphics driver and delete the software.
The first time it happened, I updated the graphics driver (Intel HD 4000), and that fixed it. Ever since I “upgraded” from Windows 8.1 to 10, the brightness adjust buttons immediately make the screen change to the lowest brightness setting – unusable in all but near-darkness. I have a Lenove Ideapad z400 that came with Windows 8.
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