What you need to know
- Multiple people are being blinded by their Macs.
- The display brightness is being set to 100% after sleeping.
- It doesn't matter what the display was set to when the Mac slept.
Some users of macOS Catalina have noted that their displays are doing strange things when their Mac wakes from sleep. No matter what brightness they were set to before sleeping, they're waking at 100%. And that's very bright indeed depending on the display you're using.
This was initially reported by Mac Performance Guide as impacting those using LG's external 5K display, but we've also seen additional reports that suggest it could be happening with other displays as well. Specifically, the super fancy Pro Display XDR.
Sometimes when I wake my Mac Pro from sleep, it sets its attached Pro Display XDR to full brightness (500 nits).Sometimes when I wake my Mac Pro from sleep, it sets its attached Pro Display XDR to full brightness (500 nits).— John Siracusa (@siracusa) January 23, 2020January 23, 2020
Others say they've been experiencing similar display-related issues with brand new 16-inch MacBook Pro notebooks as well. This from John Gruber who also wrote this up for Daring Fireball.
I didn’t even mention it in my post, but I’d say about 1 in 10 times I open my 16-inch MBP, the built-in display contrast is waaaaay off. Way too much contrast. I can fix it either by moving brightness all the way down then back up again, or by closing and reopening the lid.I didn’t even mention it in my post, but I’d say about 1 in 10 times I open my 16-inch MBP, the built-in display contrast is waaaaay off. Way too much contrast. I can fix it either by moving brightness all the way down then back up again, or by closing and reopening the lid.— John Gruber (@gruber) January 23, 2020January 23, 2020
And then there's iMac Pro, too.
It's certainly not beyond macOS Catalina to carry a bug or ten, but we can imagine this one being particularly irritating if you're someone who needs their Mac to be "just right" for things like photo and video editing. Gruber pointed to one user who just couldn't live with having to re-calibrate their display repeatedly each and every day. So they just returned their Mac.
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Oliver Haslam has written about Apple and the wider technology business for more than a decade with bylines on How-To Geek, PC Mag, iDownloadBlog, and many more. He has also been published in print for Macworld, including cover stories. At iMore, Oliver is involved in daily news coverage and, not being short of opinions, has been known to 'explain' those thoughts in more detail, too.
Having grown up using PCs and spending far too much money on graphics card and flashy RAM, Oliver switched to the Mac with a G5 iMac and hasn't looked back. Since then he's seen the growth of the smartphone world, backed by iPhone, and new product categories come and go. Current expertise includes iOS, macOS, streaming services, and pretty much anything that has a battery or plugs into a wall. Oliver also covers mobile gaming for iMore, with Apple Arcade a particular focus. He's been gaming since the Atari 2600 days and still struggles to comprehend the fact he can play console quality titles on his pocket computer.