I have a strange story, and I don't know where else to tell it.
I just applied the new "security update 2020-004 10.14.6 Mojave" on a patched MacBookPro8,3 (2011, 17-inch). Had a weird (unrelated) problem shutting down so I had to power off by holding the power button, and then the software update applied when I started the machine again. I let it do its thing (screen went black for a bit in the middle) until eventually it got to a gray screen with Apple logo and progress bar overlaid with a "stuck" white spinner. Then powered off again and went through reinstalling patches from a Mojave Patcher partition, then booted up and reinstalled all updated patches with the Patch Updater app, and rebooted again. The usual procedure for recovering a patched Mac after an Apple system update.
It's at night, and the room at this point is fairly dark with just one dimmable lamp on low, but my screen also seems darker than usual, which is bad because it's been pretty dark for months since I upgraded to Mojave with the patcher.
Without thinking, by force of habit, I reach for the brightness up key on the keyboard.
It works. The screen is very bright now.
What the... ?
I've run the DosDude1 patcher on several different Macs over the last several months. I've gotten used to the fact that brightness control is often lost. I am almost absolutely certain that I spent a couple of months trying various things to get brightness control back on this specific MacBook Pro, which is my main machine (it has a bad GPU disabled via the NVRAM trick). Nothing ever worked to get the brightness control back, and I haven't yet physically disabled the GPU so it also gets quite toasty at times because the trick of copying the old driver kext for the video card doesn't seem to work beyond High Sierra. But I eventually gave up fixing the brightness control and just set up the Brightness Slider app from the App Store using Fn+F1/F2 keys. It's sitting in my menu bar right now.
But suddenly the standard brightness controls are working again. Which I only discovered by forgetting that they weren't working.
I really have no idea exactly how excited to be about this. Did I just miss the trick that would have gotten this working months ago, or is this a sudden new development somehow caused by this recent security update?
Can anyone with a similar MacBook Pro confirm that they had no brightness controls prior to installing this recent security update, only to have the brightness controls start working again immediately afterward?
In other words, am I just an idiot or did some kind of minor miracle just happen?