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Resetting the SMC depends on the type of Mac that you are using, but the procedure is almost the same across all Apple products. The following is the procedure of resetting the SMC according to the guidelines provided by Apple. Thus, a reset of the SMC might help alleviate the problem. Control of response to a sudden movement of the Mac.

Detection of ambient lighting condition.Responding to the opening and closing of the lid on a portable Mac.Responding to the press of the power button.

SMC controls a number of core functions on the Mac, including the following: Alternatively, there could be a problem with the System Management Controller (SMC). Some Apple computers, for instance, have ambient light sensors that dim or brighten the screen automatically depending on the surrounding lights, and this could be the reason behind the iMac adjusting its brightness. The simple answer is that there are multiple reasons why iMac display can reset itself to the maximum. What causes brightness on the Mac to reset to maximum? While this is not an issue experienced by a majority of Mac users, it can be annoying, especially if the user prefers a mid-level brightness that is not too much on the eyes. Some iMac users even wonder why display on iMac is always on maximum brightness despite their best efforts to tweak the display to their preferred settings. Sometimes, and to much frustration of the users, brightness on iMac automatically resets to the maximum.