simima
Level 1 (26 points)
Mac OS X

Q: Mac OS Sierra: Erratic resolution of Dell 4K P2715Q monitor

I thought I had solved the problem (as posted in another thread I can't edit anymore), but in fact, it isn't. Just looks different now...

The problem is related to Mac OS Sierra, as I didn't have these issues before.

 

What happens is that the resolution that I had set on my 4K monitor (Dell P2715Q) erratically changes to a lower resolution, typically after the Mac went to sleep. It *sometimes* then wakes up with a lower resolution, and the resolution set before is not anymore available in the monitor settings!

Restart usually helps (whereupon not only the correct resolution is set, but the respective resolution is available in the monitor settings).

 

Really weird. Anyone seeing the same?

MacBook Pro (Retina, 13-inch,Early 2015), OS X El Capitan (10.11.3)

Posted on Sep 23, 2016 2:46 AM

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simima

Q: Mac OS Sierra: Erratic resolution of Dell 4K P2715Q monitor

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  • by milleron,

    milleron milleron Sep 26, 2016 2:35 PM in response to simima
    Level 1 (18 points)
    Safari
    Sep 26, 2016 2:35 PM in response to simima

    Definitely.

    http://superuser.com/questions/1116866/macos-sierra-doesnt-scale-for-4k-monitor/ 1126490

     

    But there's no workaround so far other than rolling back to El Capitan. Apparently, it will take a new Sierra release with an updated video driver to fix this problem.

    What I can't discern from the various Internet posts so far is whether this problem is peculiar to the MacBook or occurs on all Macs.

     

    I have an iMac, and I don't see anyone explicitly describing this problem on my hardware as yet. However, I depend on my Dell P2715Q too much to risk upgrading to Sierra until this question is answered.

  • by BobHarris,

    BobHarris BobHarris Sep 26, 2016 3:31 PM in response to simima
    Level 6 (19,536 points)
    Mac OS X
    Sep 26, 2016 3:31 PM in response to simima

    Everyone that has these monitor resolution problems should file their own Bug report with Apple so that they know that each and every one of you is having these problems.  Depending on one person filing a bug and hoping Apple will do something about it is not sufficient.

     

    BugReporter (Free ADC (Apple Developer Connection) account needed for BugReporter)

    <http://bugreporter.apple.com>

    Anyone can get a free ADC account at:

    <https://developer.apple.com/register/index.action>

  • by simima,

    simima simima Sep 26, 2016 11:01 PM in response to simima
    Level 1 (26 points)
    Mac OS X
    Sep 26, 2016 11:01 PM in response to simima

    At this stage, I can only recommend to stay away from Sierra if you're using external screens, clamshell mode and if you're using a NAS. Problems got worse since I wrote the above.

    I'm currently having 1-2 kernel panics per day, the mentioned resolution issues (whereupon sometimes the screen remains black, only resolvable by hard reset, and volumes only mapping after repeated password inputs, magic load on the CPU (kernel task), unresponsive UI, and other.

    What concerns stability, Sierra is for me certainly the worst major release since years. Let's hope Apple will fix it.

  • by BobHarris,

    BobHarris BobHarris Sep 27, 2016 6:12 AM in response to simima
    Level 6 (19,536 points)
    Mac OS X
    Sep 27, 2016 6:12 AM in response to simima

    I'm currently having 1-2 kernel panics per day,

    Kernel panics are often times the result of 3rd party additions.  I would suggest you start a separate new "Post" just for the kernel panics, posting the output from a few of the panic reports in the new Post.  Do not do it in this thread, as that will just confuse and dilute the monitor issue.

    Kernel Panic reports: Finder -> Go -> Go to Folder -> /Library/Logs/DiagnosticReports

    <http://support.apple.com/kb/ht2546>

    <http://support.apple.com/en-us/HT200553>

    The panic report should have "panic" in the file name.

     

    Also in the new Post, you might include the EtreCheck output, which is often times helpful

    <https://discussions.apple.com/docs/DOC-6174> or <http://etrecheck.com>