This is odd, because my co-worker and I have the same monitor, the Asus PB278. I don't have the issue, but he does because he has a dedicated GPU in his machine...
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Users Report Loss of HiDPI Scaling on External Displays in macOS Sierra
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This command in Terminal and a reboot fixed it for me on Sierra.
sudo defaults write /Library/Preferences/com.apple.windowserver.plist DisplayResolutionEnabled -bool true
sudo defaults write /Library/Preferences/com.apple.windowserver.plist DisplayResolutionEnabled -bool true
Adding my observations... my Asus PB258Q 25 (2560X1440) monitor has been limited to 1080p on Sierra since the first beta. Retail release and beta 1 (post launch) has not brought 1080+ resolutions options back. macOS detects the default as 1080i by default now and scaled options only display up to 1080p. (Connected in clamshell mode via mini displayport to my Retina Macbook Pro, 15-inch - Mid-2012)
Clearly this is a bug since many of us still have these resolutions. If Apple had some sinister plan or had done this intentionally, it wouldn't be so randomly distributed. I suggest rather than posting snarky anti-Apple jabs on a blog that the affected people post bug reports to help Apple identify the cause and solve it.
[doublepost=1474646008][/doublepost]And an editorial suggestion; given that not all of us are experiencing this, maybe the article should say "Some Users..." and not just "Users"
[doublepost=1474646008][/doublepost]And an editorial suggestion; given that not all of us are experiencing this, maybe the article should say "Some Users..." and not just "Users"
Mac OS Sierra seems to have enabled full 4k support to my LG 43UH750V at 60hz with proper scaling over mdp. I could never get it to work properly on el Capitan. So for me Sierra has been a fantastic update scaling wise.
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I'm not so sure because there are other unfixed monitor bugs that have been ongoing.
My 1440p monitor doesn't get the colour mode detected properly and the image is awful until I applied some hack that I got from Mac Rumors. But updates break it again and I have to start over, so I am always reluctant to update. And since updating to El Capitan the monitor sometimes won't wake from sleep (my Apple ethernet adaptor almost never wakes from sleep, another ongoing issue since I got my late 2013 rMBP).
I noticed this in the first beta and after a while I logged a radar. It was eventually closed as a duplicate of another but I couldn't find that one on open radar. https://openradar.appspot.com/radar?id=5009581688225792 is mine. It includes a note about the duplicate if that helps someone.
I switched cables and mine finally shows 1440p resolution. I was using an HDMI 2.0 cable and now Im using a mini display port to display port cable.
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Some Mac owners are reporting problems with external monitors and the use of scaled resolutions since installing macOS Sierra earlier this week.
Several MacRumors readers using 4K displays have described the disappearance of scaled HiDPI resolutions beyond 1920x1080 since updating from OS X El Capitan, leaving their options reduced to 1080p or a non-scaled native resolution of 3840x2160. Monitors with native 1440p resolutions also seem to have had HiDPI scaling options removed.
Scaled options in Sierra (left) and OS X El Capitan (right) when holding the Option key.
Owners of larger displays often use Apple's scaled HiDPI resolutions offered in Display preferences to enjoy increased desktop space without reducing the legibility of text. MacRumors forum member Sheza warned:
Some readers have reported unsuccessfully trying alternative monitor cable connections - switching over from DisplayPort to HDMI and vice versa. Others have tried using third-party resolution utilities like SwitchResX, with mixed results.
A separate report posted on StackExchange, viewed 1,259 times, details the same issue:
MacRumors can also confirm that the issue appears to be software-related, since the scaled resolutions reappear when affected Macs are rolled back to OS X El Capitan. The issue does not seem to be limited to a particular monitor brand and the latest Public Beta (10.12.1) of Sierra released on Thursday does not reinstate the missing resolutions.
It's unclear if the change is intentional or whether Apple will re-introduce the scaling options in a forthcoming update. Sierra Beta users are advised to submit feedback to Apple using the Feedback Assistant app located in /Applications/Utilities.
Article Link: Users Report Loss of HiDPI Scaling on External Displays in macOS Sierra
