U2715H, Macbook Air, black bars

Question

Hi,

I've purchased a new U2715H yesterday. I use it with 3 Macs:
Mac Mini - Mid 2010 (GPU: Nvidia GeForce 320M) - works great
Macbook Pro Retina 13" Early 2015 (GPU: Intel Iris 6100) - works great
Macbook Air 11" Mid 2011 (GPU: Intel HD Graphics 3000) - works not so great

So, to the problem:
All the three computers connected with the same mini displayport to displayport cable provided, and supply the same resolution to the screen (2560x1440@60, the screen optimal) which is also what reported by the screen (the bottom line on the menu). BUT, for some reason the Macbook Air is "boxed", there are black bars and the image area does not fill the whole screen. the bars are approximately 0.75" in all directions. Apple spec says that this resolution is supported on all three. What can be the problem? why only the Macbook Air has black bars?

I'll appreciate any help here,
Regards,
Lior

lior.amsalem · Accepted Answer

Clean install of Yosemite fixed the issue.

DELL-Chris M · Answer

Thanks for posting the updated fix. Since we do not test this monitor on apple, this should help other apple users.

xaosnox · Answer

Same problem here with a Dell Dell U2415 except the black border is about 3/8'. A clean install of Yosemite is not a fix! Do you have any idea how many weeks it would take me to get my Mac functional again after a clean install? I just got this monitor last night, and would swear that it was working fine because I was checking it to make sure everything was working, and I would have noticed this instantly, like I did tonight. There should be a cache or preference file that needs to be deleted. I'm very surprised that Dell doesn't test on Macs. It's not like they are an insignificant share of the market. Wishing I'd bought a Viewsonic instead. I'm kind of surprised there are no vertical/horizontal adjustment options in the monitor's settings. The manual's trouble shooting section says to adjust them if this issue is encountered, but they aren't there. I'd sooner return this and get a functional monitor than waste a week reinstalling and configuring the OS and over 700 apps and plugins. Hopefully someone has a real solution. Thanks in advance!

xaosnox · Answer

Well, after reading the OP's solution and giving it some thought, I booted my MacBook Air into safe mode to clear the cache files rather than trying to hunt down the culprit, and viola! Fixed.

I'm glad I confirmed that I wasn't hallucinating last night when it was working fine. Hallucinating is great, but only when I've done something to cause it, like some really good hypnosis!

Those 15 years I spent in IT support for creative departments really come in handy at times like these.I feel sorry for people who just reinstall their OS every time there is a problem. That is NOT a solution on a Mac or any other *nix OS. It's admitting defeat. With Windoze, it's a bi-annual necessity, but I have an Xserve that's been running OS X Server in a company I used to work for that has over 14 years of continuous uptime. The share points still have "test" in their names! No need for security updates because it's running a solid OS on PPC chips that don't have Mossad/NSA backdoors like Spectre and Meltdown that are in every Intel and AMD chip since the Israelis started making them.

Monitors

U2715H, Macbook Air, black bars

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