Thunderbolt USB not working in Yosemite

You really didn't fix anything. You bypassed the problem with a quick fix that now prevents you from a major thunderbolt feature of daisy chaining additional devices to your computer. If that is all right for you then great. But you could have purchased a regular display for a lot less money if you didn't opt for the thunderbolt hub feature.

Dennis, what I did was establish the cause as being the cable itself. If I wanted to be able to daisy chain any thunderbolt devices to my display, I will have to pay my local Apple store the money to install a whole new main cable. I certainly can do that, but as I have never before used the thunderbolt port on my display in the 2.5 years I have had it, I don't see the sense in that now. I thought it might be helpful to others to know of the "fix" I used in case it might be of value to them.

Hikesnh, your fix has been published in many other forum topics as well. Most of the folks who reported that new Apple "repaired" THDisplays would fail shortly after getting these "repairs". There would appear to be a combination of hardware and software problems with these displays. For me, I need the Thunderbolt hub to be functioning and available to daisy chain to other devices. I've been dealing with Apple tech support for nearly 9 months with no cure. A tech person will start the session saying that he'll be with me until the problem is fixed. Then after a couple weeks of trying, the tech stops returning emails or phone calls. Then I have to start over again. I've made the same little tweaks with every new tech person. At this point I'd rather have my money back. I purchased two of these displays and both act the same. A plain old 27" display costs a lot less than these TBDisplays. I love Apple products because they always work. These displays don't.

Thank you!! This solved my problem. The Apple Store replace the monitor cable and I had vide but no USB connectivity.

By the way, I bought a new MacPro system with a Thunderbolt display and an AirportStation.

I had to send back the Display and the Airport Station. TWO out of THREE!!

I wonder about the quality of the hardware produced by Apple.

Apple has had a ton of issues with Yosemite, not only with TBDisplay, but also with releasing compatible USB drivers. I don't believe these are actually hardware issues at all. To those who needed to have their logic boards replaced, perhaps the faulty drivers caused some type of catastrophic heat damage that fried the inside of your displays...I don't know.

What I do know is that since migrating over to Yosemite, everything related to USB isn't working the same way it was with Mavericks. For instance, my early 2011 MBP "15 will not recognize the standard Apple CD / DVD burner when it is connected to a TBD. After looking in System Information, we find that much of the things we are complaining don't work all are connected through internal USB connections - FaceTime Camera on TBD, Bluetooth module is connected through some type of internal USB hub, thus causing all of our Bluetooth keyboard / mice issues.

I don't have a good fix for this problem, but it's been around for a while now and it doesn't appear Apple is any closer to fixing it. I will try the work around using a new thunderbolt cord, but like others have said, a $40 cord to fix a $1000 monitor that was destroyed / malfunctions by Apple's very own drivers is my beef. I'm out of AppleCare, so if my TBD kicks the can, I'll let you guys know so you can join my class action suit.

My "new" senior tech (number 4) has shown some of my log files to engineering to see what they see. So their first request was to connect my two TBDs directly to the two TB ports on my 2013 MBPro. Then I'm plugging my CalDigital TB hub into one of the TBDs. So far the non-waking has stopped - its only been one day. But the problem I'm having now is I'm losing my internet connection when the TBD and system goes to sleep. My ethernet connection is to the CalDigital TB hub. If my TBD problem goes away with this type of routing of wires, I still have a problem. I want to be able to daisy chain one TBD to the other TBD. But that method produced daily non-waking issues. So this is just a work around, not a fix. My only hope is that I have another year of Apple Care protection. But I really just want my money back. I realize now that these TBDs are not worth anything. The documented problems have made these displays worthless. So when you file your class action suit, I'll be ready to join you.

I HAVE JUST FIXED IT!!!!

Had same problem. I have mac book air and 2 thunderbolts, on e at home and one at work .My assistant has a Mac. Since we updated to Yosemite, Thunderbolts' USB ports didn't work properly, and sometimes keyboards (no wireless) just didn't work in one of the computers. Just wireless keyboards worked. I called to Apple support but they couldn't find why. I made some test and realized that problem was fixed when I switched off bluetooth in all computers!!! It sounds strange, but it is the way I fixed.

So if your keyboard and mouse are not optical, switch off bluetooth and try. USB thunderbolt ports should work again!

I'm having the same issue with 2 thunderbolt displays that are daisy chained to my MPB since upgrading this week to Yosemite 10.10.2.

Previous versions worked fine for me.

Currently my Thunderbolt Display usb ports are essentially dead.

When I stop daisy chaining thunderbolt displays and only connect one Thunderbolt Display into my MBP USB ports work... something (in this version of software) breaks down (for me) when daisy chaining a second Thunderbolt Display to the first Thunderbolt Display.

Please keep me posted! I would like to get up and running asap... I have clients coming in within the hour.

Thnx!

I am also having the same problem since upgrading Yosemite on my macpro. Costing my business a small fortune now, and Apple appears unconcerned that there is a problem that is not going away. Given that Microsoft and its third party ecosystem is so diabolical, Apple knows it can do what it likes with its customers.

So my new Apple Tech has me trying a few different configurations in order to trouble shoot hardware issues. My original setup was this: MBPro TB port #1 to CalDigital TB Station. MBPro TB port #2 to TBDisplay #2. TB Display #2 TB port out to TBDisplay #1. The CalDig TB hub has three USB 3 external HDs and my Ethernet connection. I used to have 2 other external HDs connected to the USB ports of TBD #2, but they kept on getting "ejected incorrectly" whenever the TBDisplays didn't wake up from sleep mode. So I disconnected them for now.

Apple Tech asked me to remove the CalDig TB hub from the MBPro port #1 and then to plug TBDisplay #1 to MBPro TB port #1. That has been changed. Then I plugged my CalDig TB hub into the TB port of the TBDisplay #2. Problems changed with the CalDig USB drives being "ejected" after the computer goes to sleep. I'd also lose the ethernet connection to my network. So problem continues, only in a different way.

Plan number 3 from Apple Tech. Reverse the MBPro port connections to the two TBDispalys. So MBPro TB port #1 now goes to TBDisplay #2 and MBPro TB port #2 goes to TBDisplay #1. CalDig TB hub stays connected to TBDisplay #2 to see if anything changes with the issue of losing the USB ports on the CalDig hub or the ethernet connection. This is testing the two MBPro TB ports. I'm on day two of this current arrangement.

Keep in mind this doesn't fix anything yet. This is just trouble shooting the various hardware TB ports on the MBPro and the two TBDisplays. From my reading, it is not ideal to plug TB devices into the TBDisplay for a couple reasons. First is my 2013 MBPro has Thunderbolt 2 ports. The TBDisplays only have Thunderbolt 1 support. So quite a loss of the TB 2 performance. So whatever you connect to the TBDisplays, they lose the TB 2 uprated performance. Second is my understanding that you want the displays to be at the end of the chain. Ideally I'd like to be able to daisy chain the two displays since they sit right next to each other. I would not need to buy longer TB cables to connect these devices to other TB hubs. So far it looks like the TB hub and USB hub on the TBDisplays may have issues. But it could also be the TB ports on the MBPro. I don't think that makes a whole lot of sense given everyone else's problems with various Mac computers and circa 2011 reports of problems with the TBDisplays. It could also be a software issue that includes all of the OSX versions since Thunderbolt ports became available. But what the **** do I know. I know nothing about the hardware or software. I just know that my system is crippled with having to deal with these issues and to have had them since last january 2014.

Dennis

I am now just discovering this problem as well with my MBP 17" and TBD. This is frustrating that it has been going on now for about 6 months and there doesn't seem to be a fix.

I've been struggling with problems with my two TBDisplays for a year now. I'm working with one Apple tech now for 3 months. I keep sending them data captures with failures on every different setup they would like me to try next. After two weeks of silence and no replies to my emails, the guy comes back with the error reports are inconclusive. REALLY. That is the opposite, the results are conclusive, the TBDisplays are failing with every possible setup they ask me to do. How is that inconclusive? Who do we have to call to get these displays recalled? Who do I have to call to get my money back? I'm tired of this crap. This is BS pure and simple.

Disconnecting Bluetooth seems to have solved this problem for me. Strange, hey?

I have a MBPro Early 2011 model to which I added a TBD about 2 years ago. Like the original poster of this thread, I use all the rear ports of the TBD to charge and connect iphones, ipads, external hard drives and (occasionally) a mouse. This leaves my working space cleaner and allows me to use the few ports available on the MBP for incidental use. My printer is connected wirelessly through a time capsule.

When upgrading to Yosemite in late 2014 all functionality of my TBD usb ports vanished. As I made the upgrade at the same time as upgrading my phone to iOS 8, I couldn't originally tell whether this was a phone, computer, or TBD issue.

I've done all the usual things which people recommend... restart; reinstall; PRAM; SMC etc. Have called Apple. Have visited the Genius Bar.

By way of comparison, my MBAir is still running Mavericks. The TBD usb ports are fully functional when connected to my Mavericks device.

One commenter in this thread (I can't find it now!) suggested they had fixed the functionality issues by disconnecting Bluetooth from their devices. I've just done the same, followed by a restart. All my functionality of the usb ports through the TBD has been restored - that is, while running Yosemite through the MBPro. All external hard drives are operational again; phone is charging; image capture is working; itunes is connected to iphone.... This is the first time that the system has worked since Yosemite was installed 6 months ago.

I don't daisy-chain to other displays, so can't give any feedback on whether it would work in such a case. Nor do I use a wireless keyboard, sorry.

I'll report back if the situation changes.

MBPro Early 2011. I had the exact same problems for a long time. I just stumbled upon this thread and I tried the following:

Turn Bluetooth off.

Connect a USB device to the Monitor again.

It worked!!!

Connected the keyboard to the monitor again.

I worked!!!

Rebooted the MBPro.

Logged in, turned Bluetooth on.

It still works!!!

Problem solved ;-)

Well my semi local Apple store manager surprised the heck out of me. I brought my two TBDisplays and computer and TB hub in for a couple rounds of genius bar tech time. After going over the last 3 month long case file, they came to a conclusion. They offered to refund me my entire purchase costs, including my Apple Care plan for the two monitors that I had for nearly 16 months............I jumped at the offer. I wished for this answer, but never thought they would do this. My online and telephone Apple tech said he couldn't make that offer, nor would he tell me who could. The bottom line is Apple knows there is a problem with the TBDisplays. My best guess is there are problems with the built in hub in the displays. Whatever was plugged into the hub, whether another TB display or another hub or the USB ports. Those devices always seemed to be dropped for various reasons. Whether sleep mode or start up or who knows what else. I feel rather lucky at this point. I can now move forward instead of doing the constant try this, try that approach. I had over a year of that type of trouble shooting. Never once did an apple tech tell me they were looking for problems here. But the store manager and genius bar tech were well aware of the issues. Of course me bringing in two TBDisplays, computer and stuff in their original boxes on a busy saturday, might have helped. It doesn't help business to make a scene with a store full of customers. Thank you Apple.