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MBP 13 2015 display brightness issue

I have a MBP 13", early 2015 which has an occasional screen brightness issue.

It happens about once a fortnight after the notebook was left closed. Once I open the notebook, the screen flickers briefly and then seems off, but I can see the display if I shine a light on it. If I turn off the power cord and press F2 until max brightness is set - the screen works okay. But going just one step down dims the display completely. Moreover, turning the power cord back in makes all brightness settings unusable - ie. the screen is dark no matter what I click.

As mentioned, this happens randomly and is resolved by a restart until the next occurrence. For the life of me, I cannot determine a trigger - the issue doesn't seem to happen after using a specific app or after a specific update. The laptop is new, purchased less than half a year ago.

I don't feel like taking it to the store given that I cannot replicate the issue on demand.

I'm running macOS Sierra 10.12.6 (16G29).

Do you reckon this is a hardware or software issue?

最後更新：2017-08-29 00:42:05

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