Thunderbolt Display Firmware 1.2 broke the USB inside the display.

I got the same problem and I would add also that any youtube video will not work until you disconnect/reconnect the thunderbolt plug.

Have you tried o boot in recovery mode with Option down? when I do that I don't have the choice anymore to choose the startup disk. I discovered that On most portables, a yosemite install will convert your hard drive or SSD into a core storage volume. A core storage volume is used for things like fusion drives and more importantly file vault encryption. It seems that this core storage volume is the cause of the power loss in the TB display. I found out that

It is possible to revert the CS volume back to a normal volume (if you haven't encrypted it yet). I did that and all the power problem in my thunderbolt display are gone!

Run these 2 commands in a terminal.

diskutil cs list

and then

diskutil coreStorage revert lvUUID

where lvUUID is the last lvUUID reported by the previous Terminal command.

Then restart for everything to get back to normal after you have run these commands in Terminal.

Then also the recovery partition will show up again in the startup manager when you boot up with the option key.

Has anyone else tried this? I can see all the usual options for startup disks when I reboot in recovery mode. led

ETA Would there be any harm in trying this fix even though I can see the usual options for startup disks in Yosemite recovery mode? I'm not using filevault.

Just noticed another weird dimension to this issue: the problem only occurs when my MBP goes to sleep with an external drive connected through the display's thunderbolt port.

When I take out the thunderbolt device from the display and put it to sleep and wake it, sound, USB and camera all work as normal.

Hi,

I have exactly the same issue, except that I am using a LG 34UM95-P display connected via Thunderbolt. The problems seems more related to how Yosemite handles thunderbolt-displays with an external USB drive connected to the display.

The problems seems more related to how Yosemite handles thunderbolt-displays with an external USB drive connected to the display.

Which is ironic given the 1.2 firmware update description in the App store says 'This update improves reliability when connecting devices to the Apple Thunderbolt Display'.

As a side note, as well as the RAID disk, I'm also running an RGB display using a thunderbolt adapter, which I daisy chain off the second thunderbolt port on the RAID.

The second display still works fine in this mode, but not when connected directly to the TBD thunderbolt port.

The MBP doesn't recognise the second display when it's in the TBD's thunderbolt, but it does recognise it when it's plugged straight into the MBP, or daisy chained off the RAID.

By the way, I tried @duedate's fix and it didn't work for me.

Unfortunately it's not a fix for me, as using the display's thunderbolt port is the only way I can run my RAID and the TBD at the same time.

Yeah, it's not a fix. It's just that the issue didn't occur when there were no peripherals plugged into the display.

But today my display isn't waking from sleep at all. Think I'll have to take it in to be fixed. Guessing from stuff I've read on other threads that the logic board may need replacing. :-(

Think it's a hardware issue after the firmware update. Took it in to Apple and they're going to replace the logic board.