External monitor problem iMac 2017 High Sierra.

Hi all,

I have installed the Beta and want to report that I not experiencing any issues yet. I will be testing further and reporting any issues I find to Apple.

Hopefully this update will address the issues you are having.

Matthew

The display I’m using is a Dell SE2516H. When I look up drivers, it only lists them for Windows. The Dock I’m using to connect the display via Apple Mini DisplayPort to VGA adapter is a Thunderbolt 3 from OWC. The drivers page is listed here, but it doesn’t say anything about drivers for the Mini DisplayPort. Should I install it anyway? https://www.owcdigital.com/support/software-drivers

Is there an updated driver required for the Apple adapter?

Having the same issue here. Triple monitor setup that worked for years suddenly stopped working with this update - proof of working solution @ https://mkn.us/blog/how-to-use-3-external-monitors-on-macbook-pro-2015/

The mentioned solution utilized standard active cables rather any additional USB / software / drivers.

Well if you are unable to use a Time Machine backup you are also able to reinstall the version of OSX that you Mac shipped with via the recovery/safe mode options. Might be a couple of versions back perhaps but would save you money.

I am not quite sure I understand everyone’s solutions here.

1. You should always have an OS backup before you upgrade. (If you did not backup, now you know you need to backup, always.) Apple provides Time Machine, use it. My machine backs up every hour if there is an issue after any installation then I go right back to when my system was working.

2. If you are using your computer for work and it is working good... you should never upgrade, (or at least wait until all the issues are addressed with a .1 or .2 release). If it is not broke... If you need the new OS then run a dual boot so you can test your system. ( I have been running 10.13 off a flash drive.)

3. Purchasing a new monitor is not going to solve this issue. It is well documented now and I can tell you that the .1 beta 3 release has addressed my monitor issues so hopefully it will address yours. It has also introduced new bugs so I don’t see it released too soon.

4. Apple support is only as helpful as they are knowledgeable. New OS releases are very unstable and I would take any advise to buy new hardware with grain of salt. If you can’t revert back to a backup then just be patient, this OS is still fairly new. The kinks will be addressed.

Matthew

I agree people should always be cautious in upgrading, but please don't blame the victim here.

I've generally found OSX updates to be pretty good, only minor issues.

High Sierra has **MAJOR** issues.

My thunderbolt port *does not work*. That is not a "whoops" issue. It's not just monitors, it's the whole thunderbolt port.

Then there's the issue where the `WindowServer` process has a **massive** memory leak (and is seemingly so common that everyone I know has seen it) which means OSX actually has to be rebooted every other day (in my case).

Note I do have other issues, I'm just making a point here... These people aren't installing betas and expecting everything to work... they are installing final releases and things are very much broken and beta quality (early beta quality, even!)

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Sadly I did not receive beta3, but beta2 at least fixed the memory leak... beta 4 just released last night, hoping to find my thunderbolt port working again 🙂

I am confused, what did not work in Serria? If the monitor did not work in Sierra then that is a different issue then the issue most of us are experencing here.

My issue as well as others in this post had working monitors with Sierra and then had some sort of issue after upgrading to High Sierra.

Sorry I misunderstood what you were explaining.

This worked on a Macbook Pro 2013 with dual external monitors, one connected via HDMI and the other with a USB to HDMI adapter. Use the updated driver linked below!

From csdoyle > "if you use a DisplayLink system: http://www.displaylink.com/downloads/file?id=1033

otherwise try downloading the newest driver for whatever external display you are using."

I am not blaming I am just trying to explain the reality.

Do you think Apple would postpone an OS release even though it had issues?

I know new OS releases are enevidable, but High Sierra seems to be suffering from the lets get it out instead of lets do this right.

There are a lot of issues with High Sierra and you can see by an immediate supplemental release and then a .1 update that is in the works.

The best thing to do is be patient while Apple fixes things.

Matthew

It is absolutely a software issue they obviously disabled it . I have a mini DVI to HDMI connected to my laptop and I have the HDMI hooked into a switcher which illuminates blue when there's power going through it there is zero power going through it they obviously disabled that when we upgraded to macOS High Sierra among other problems you also cannot play PS4 remotely on your Mac now they're a bunch of other things that you cannot do as well as these apps are no longer supported Kinda ***** that you have to wait to you something that you've used probably every day I use my Mac to watch movies and now I can't . they need to fix it .

That's a good point, because I was thinking of having to do the same thing this weekend. I dont think it's a software issue, in the sense that this is something Apple chose to do. There would be little to be gained by alienated a large proportion of your customers, after all. In their defence, I have an HD Ready TV which I use as a 2nd monitor (of 3) in my music studio. That worked initially straight after the upgrade, but I had all sorts of interesting fun and games working out that Accessibility had gone a bit bezerk during the upgrade, and afterwards a large rectangle followed my pointer around the screen! Bizarre! Once that was fixed - that was the moment I lost the TV monitor. It's struggled to connect during the week, which actually led me to assume the screen itself had gone, not that there was a problem connecting. I think this is a 'junction' issue in the sense that my original problems arose from Accessibility, which is a hub for all manner of inputs, not least screen sharing and displays. So I'm going to hang fire for a few days and hope Apple fix this, as I can see this is something adversely affecting a great many of us, and spoiling what in many other ways I've found a wonderful upgrade...