Do they work? Exit Safe Mode (just restart your Mac normally) and test your problem again. Click Continue in Safe Mode and then release the Shift key.Select your startup disk, e.g., Macintosh HD.Press and hold the power button until the startup options window appears.Keep holding the Shift key until you see the login screen.Restart your Mac and immediately press and hold the Shift key.And wait for your Mac to power off completely. Note: You may go to the Apple menu > About This Mac to figure out if you have a Intel-based or Apple silicon Mac. The slider in the touchbar moves but does nothing, and the slider in the control panel is grayed out. Simply restarting your Mac in Safe Mode may help you fix your problem. Hi I just updated my Macbook Pro 2017(with Touchbar) to Big Sur 11.3 and I cannot adjust the brightness of my screen. Boot into Safe Mode, test your problem, leave Safe Mode and test your problem again. If resetting NVRAM does not work, you may want to reset the SMC to see if this resolves. Then try to adjust your brightness to see if it starts working. Then release the keys after the second startup sound or the Apple logo appears and disappears for the second time. Keep holding these keys for about 20 seconds.Turn on your Mac and immediately press and hold these four keys.On your keyboard, locate these four keys: Option, Command, P, and R.You can check this by going to the Apple menu > About This Mac. Note: You can reset NVRAM if your computer is an Intel-based Mac. NVRAM (nonvolatile random-access memory) stores your display settings. I have a Mac mini with Yosemite (10.10.2) & a 23 LG monitor. Note: you don't have to tap on the keys for every reboot - just once will do it.Resetting NVRAM or PRAM can fix your problem. Tapping on the sound or brightness keys once every two or three seconds during reboot revivies them. In closing : I don't believe the root cause is SimonSays, but there is a relationship between a Dock corruption (?) issue and the loss of the hardware keys and that of the slider control in the panel. After reboot, I logged in and SimonSays was off the dock and the sound and brightness keys were working. What I did was to log in, disable all startup items in my login prefs. įinally, a last surprise : I can no longer re-create the problem - because I finally managed to remove the Application (SimonSays) from the dock - and it remained off the dock after reboot. Trouble is that sometimes even the lowest setting is too bright for midnight screen gazing. 21:29:51.008 loginwindow Uninitialized rectangle passed to. Using a Mac laptop at night is great thanks to automatic-brightness controls and a backlit keyboard. 21:29:51.008 loginwindow *** Assertion failure in -, AppKit.subproj/NSView.m:709 Upon reboot and loggin in, the hardware keys for brightness and sound would not work, *and the Application I had removed previously was again in the dock.*įurthermore, I noticed the following error message in the console: Brightness Slider cannot be removed completely from Mac, there are still some files and components leaving on the computer. I'm not 100% clear on the relationship, but I managed to re-create the problem by removing an Application (SimonSays) from my dock. Which means I re-created the problem wherein the sound and brightness keys weren't working. However, this is the strangest part: I've replicated my workaround three times. My workaround is to reboot the machine, and during the reboot process, tap on any of the brightness or sound keys once every two seconds. I have a proposed workaround to this problem. Others have noted this issue as well - but I couldn't get a login account on their site to post a response - which is why I am posting it here on MacFixit. After applying a patch to Tiger, I found my brightness and sound control keys on the keyboard were non-operational at some indeterminate time (meaning I rebooted the laptop several times and eventually noticed that my sound and brightness keys weren't working)Ĭuriously, while the brightness and sound control keys were not working, I also noted the brightness slider control was missing form the System Preference Panel for Display.
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