14 DAY TRIAL // Microsoft hasn’t yet resumed the Windows 10 October 2018 Update (version 1809) rollout, but in the meantime, reports of bugs hitting this release keep coming.
One of the most recent causes the brightness level to be reduced after each reboot, with user reports posted on the Microsoft Community forums indicating that setting brightness manually makes absolutely no difference.
In short, the brightness level is automatically lowered to 0% or 25% after boot, and even though users manually set it to a higher value, it’s automatically reduced after the computer restarts.
Some of the people whose devices were impacted by this issue believe it’s caused by the adaptive brightness option in Settings, but as it turns out, this isn’t the case.
No fix available just yet
On the other hand, with no workaround available for the time being, users have tried pretty much everything to resolve the brightness issue, though all their efforts came to no conclusion.
“I'm having the same issue, where the screen occasionally resets brightness to 50% or so. It started immediately after installing the October update. It seems like Microsoft tried to migrate the adaptive brightness away from the classic Power Options and into the new Display Settings, but left out the small detail of actually adding the setting. It's referenced in Ease of Access that you should be able to change adaptive brightness in Display Settings and it even links you there, but the option doesn't exist,” one user explains.
The most recent cumulative update for Windows 10 version 1809 doesn’t bring any improvements in this regard, and the bug is still encountered on all PCs.
Microsoft is yet to acknowledge the issue, so it remains to be seen if a fix would be offered when the rollout resumes. For the time being, however, nobody can download and install Windows 10 version 1809.