DELL P2415Q - problems with Sierra

Discussion in 'Mac Accessories' started by jjd, Sep 23, 2016.

  1. jjd macrumors regular

    Aug 22, 2003
    Anyone having issues with external monitors since upgrading to Sierra? I am running a 5K iMac and have had a Dell 4k monitor running off it over DP. Had no issues till now. Since going to Sierra, have had several episodes of the Dell losing the correct orientation and crashing at higher res settings. Worse, it also has a habit of crashing the iMac such that both screens go blank and are unrecoverable without a (hard) reboot... Oh and a lot more fan noise since Sierra.

    None of these issue on El Cap...

  2. campyguy macrumors 68040

    Mar 21, 2014
    I've chimed in within a few threads in the Sierra Forum, others are having issues with their 4k displays. This morning I visited a couple of my sub-consultant's offices and was told they are having identical issues. Me, and none of my workers are having problems with the upgrade and our displays; I have a few field offices, and carry a go-bag that includes things like scales (normal people call them "rulers"), a laser level and an electronic level, and, a couple of mDP>DP cables...

    I loaned one of my subs the two cables I bring with me, and the "problems" on that Mac workstation disappeared. I'm guessing now that some Macs might be a bit more picky about which cables are being used (I use only Accell cables now, they're on the DP Product Portal - the stock Dell cables by COXOC returned power over Pin 20, so I binned them) and/or there's a bug in the OS? I used several of the Betas and never had an issue on my rMBP and I'm actually seeing more resolution options now on my two P2715Q displays attached to my rMBP. In those threads, a few members related that even TB cables (DP 1.1a) aren't working for them; I've not tried one of my TB cables, but I don't have a need to do so. FWIW, when I swapped out for the Accell cables, our Mac/PC operating temperatures dropped a fair amount and at least one other member backed that up. That's all I've got, good luck...
  3. jjd thread starter macrumors regular

    Aug 22, 2003

    Thanks very much for this. Pretty frustrating that the cable that shipped with the monitor, and that worked fined with El Cap, needs to be replaced. But, will order a new cable

  4. filchermcurr macrumors newbie

    Oct 17, 2016
    Did the replacement cable solve your problem? I've downgraded to El Capitan but since OS X is iterative, it makes sense to assume that whatever the latest and greatest is will have the same problem going forward. I'd like to solve it before the El Capitan security updates dry up.
  5. jjd thread starter macrumors regular

    Aug 22, 2003
    The new cable did not help I'm afraid. I am at a point now where the Dell is a desk ornament only. I'm pretty furious
  6. chrfr macrumors 604

    Jul 11, 2009
    Others have reported that 10.12.1 improves their situation with 4k displays. Have you updated your computer?
  7. HenryAZ macrumors 6502a


    Jan 9, 2010
    South Congress AZ
    I am updated, and using an Eizo EV3237, running at 3840x2160 @60 Hz. It uses SST over a displayport connection. I have experienced no display issues at all with 10.12.0 or 10.12.1. I have had other issues (one with Fusion, mostly) on Sierra, but no display issues.

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6 September 23, 2016