Ever since Apple released its first Thunderbolt-equipped machines earlier this year, reports have been surfacing from a number of users complaining about flickering issues on company's 24-inch LED Apple Cinema Display when used with the new Thunderbolt-equipped machines.


Apple has apparently quietly released a firmware fix for the issue, although the update has not been publicly announced and its existence appears to have only been revealed to a small number of customers who have escalated their issues through Apple's support systems.

A link (.dmg download) to the firmware update was posted to Apple's discussion forums earlier today, and a number of users who have applied the update have reported at least initial success with addressing the flickering issues. Users report having to reboot their systems and power cycle their displays in order for the displays to function properly after applying the update.

From the description included in the download file:

The 24-inch LED Cinema Display Firmware Update addresses an issue that may cause intermittent display flickering. This firmware will only install on the Apple 24-inch LED Cinema Display when it is connected to a Thunderbolt-enabled Mac.

IMPORTANT:
This firmware update may not resolve the flickering issue if a Mini DisplayPort extender cable is used.

NOTE:
Some USB and FireWire devices may prevent firmware updates from installing correctly; disconnect non-essential devices and use only an Apple keyboard and mouse to apply the update.

Full instructions for installing the firmware update are also included in the documentation.

It is unclear why Apple has yet to publicly issue the firmware update for all 24-inch Apple Cinema Display users, and thus users should exercise caution in deciding whether to apply the update and prefer to check with Apple support regarding their specific issues.

Apple introduced the 24-inch LED Cinema Display in October 2008 and officially discontinued the model in July 2010 when Apple consolidated its display offerings with the 27-inch LED Cinema Display as its sole offering. Apple did, however, continue to sell off its remaining stock of 24-inch displays for a number of weeks after the official discontinuation.

Update: Apple appears to have pulled the firmware update without explanation.

iFixit has managed to get its hands on one of Apple's new Thunderbolt displays, subjecting it to one of the firm's usual thorough teardowns. iFixit was pleasantly surprised at how easy it was to disassemble the new display, and upon opening found a considerable amount of hardware inside to support the display and the docking station functions included in the package.

Both sides of the logic board are packed with enough chips that it’s hard to believe there’s no computer inside this display. Standouts include:

- Pericom PI7C9X440SL PCIe-to-USB 2.0 host controller
- L129NB11 EFL, which looks to be the Thunderbolt port controller
- Analog Devices ADAV4601 audio processor
- NXP LPC2144 USB 2.0 microcontroller
- Delta LFE9249 10/100/1000 Base-T LAN filter
- SMSC USB2517-JZX USB 2.0 hub controller
- Maxim MAX9736B Mono/Stereo high-power Class D amplifier
- LSI L-FW643E-2 open host controller interface
- Broadcom BCM57761 Gigabit ethernet controller
- Supertex HV9982 3-channel switch-mode LED driver IC

The display also includes an integrated 49-watt, 2.1-speaker sound system with a small 1-inch subwoofer, as well as a 720p FaceTime camera and integrated microphone.


Thunderbolt port on logic board for accepting incoming connection
As for the display itself, iFixit discovered an LG LM270WQ1 panel inside, the same as that used in Apple's Late 2009 27-inch iMac. Interestingly, the Thunderbolt cable carrying signal to the display is connected to an actual Thunderbolt port mounted on the logic board rather than hardwiring the cable directly to the logic board. The Thunderbolt cable is secured to the logic board port with a cover screwed down on top of the connector.

We chatted with iFixit's Miro Djuric about the curious observation that Mini DisplayPort displays can not be daisy chained off of an Apple Thunderbolt Display unless another Thunderbolt device is placed between the two displays in the chain, but the teardown unfortunately does not reveal the source of this limitation.

Some speculation has centered around the possibility that a single Thunderbolt controller chip may not have the ability to output the display signal required for both the included display panel and a connected Mini DisplayPort display panel. A separate Thunderbolt chip, such as one found in an intermediary peripheral device, may be required to generate the signal for the Mini DisplayPort panel at the end of the chain.

Update: AnandTech last week provided a good technical explanation of the daisy chaining limitations.

If you connect a Mac to the Thunderbolt Display what is sent is a Thunderbolt signal. DisplayPort is broken off and sent to the display but there's no way to propagate an additional DisplayPort signal to any other non-TB displays in the chain. The output on the Thunderbolt Display is literally a Thunderbolt output, it can't double as DisplayPort.

However, if you connect another Thunderbolt device that uses Light Ridge you can split any additional DisplayPort signals out of the chain. In other words, if you connect the Thunderbolt Display to a Promise Pegasus you can then chain on another DP panel.

(Thanks, @foresmac)

With the new 27" Apple Thunderbolt Display now shipping to customers, Apple has posted a new support document outlining what can and can not be accomplished with multiple monitors on Thunderbolt-enabled Mac systems.


As far as compatibility, Apple notes that all Thunderbolt-enabled systems with the exception of the MacBook Air can handle two Thunderbolt displays, with a caveat for the 13-inch MacBook Pro being that the computer's internal display will not function if two Thunderbolt displays are connected. The high-end $799 Mac mini with discrete AMD graphics is also capable of running a third display via HDMI.

- MacBook Air (Mid 2011): One Thunderbolt display.

- MacBook Pro (Early 2011): Two Thunderbolt displays. Connecting a second Apple Thunderbolt Display (27-inch) to a 13-inch MacBook Pro will make the screen on the MacBook Pro turn black. This is expected behavior.

- iMac (Mid 2011 and Late 2011): Two Thunderbolt displays. iMac (27-inch, Mid 2011) with two Thunderbolt ports supports a total of two Thunderbolt displays regardless of which Thunderbolt port each display is connected to.

- Mac mini (Mid 2011): Two Thunderbolt displays. Mac mini with AMD graphics can support a HDMI compatible device on its HDMI port when using two Thunderbolt displays.

One other note of interest that will be a disappointment for some users is the disclosure that users will not be able to daisy chain a Mini DisplayPort display off an Apple Thunderbolt Display.

Mini DisplayPort displays will not light up if connected to the Thunderbolt port on an Apple Thunderbolt Display (27-inch).

The revelation is a bit of a surprise, as Mini DisplayPort displays can currently be daisy chained off other Thunderbolt peripherals. Some users had been hoping to reuse their existing Mini DisplayPort displays as part of multiple-monitor setups using the new Thunderbolt display, but will apparently be unable to do so.

Finally, Apple recommends that users daisy chaining the Apple Thunderbolt Display with Thunderbolt storage devices connect the display directly to the computer's Thunderbolt port, with other peripherals daisy chaining off of the display.

Update: Macworld appears to have demonstrated that you can indeed daisy chain a Mini DisplayPort monitor as long as it is connected to some other device than the Thunderbolt display. In Macworld's apparent setup, a Pegasus RAID storage device is placed between the Thunderbolt display and an older Mini DisplayPort display from Apple and all displays work properly.

It is unclear why simply inserting another Thunderbolt device into the middle of the chain allows the Mini DisplayPort display to function, but at least one MacRumors forum member has confirmed that he is unable to daisy chain his Mini DisplayPort-enabled Apple Cinema Display directly off of the new Thunderbolt display.

We've received multiple contacts that individuals have started receiving ship notices for their Thunderbolt Displays this morning. Scott from New Zealand offers up the above ship notice and expects delivery by tomorrow morning.

Forum readers have been organizing in this forum thread while waiting for deliveries. We'd previously reported that Apple had begun shipping demo units to stores last week. Apple has also been releasing various software updates to prepare for the display.

Apple yesterday pushed out a 60.30 MB Thunderbolt Software Update to provide support for the display.

This update provides support for the Apple Thunderbolt Display and bug fixes for Thunderbolt device compatibility.

This company this week has also been pushing out firmware updates for its latest Mac models, addressing compatibility with the new display as well as issues with Thunderbolt Target Disk Mode and Lion Recovery over the Internet.

Apple today released MacBook Air EFI Firmware Update 2.1, a 3.99 MB update addressing a pair of issues on the company's latest MacBook Air models. The fixes include enhanced stability for Lion Recovery over the Internet and improvements for Thunderbolt-related issues including compatibility with Apple's forthcoming Apple Thunderbolt Display.

This update includes fixes that enhance the stability of Lion Recovery from an Internet connection, and resolve issues with Apple Thunderbolt Display compatibility and Thunderbolt Target Disk Mode performance on MacBook Air (mid 2011) models.

For more information about Lion Recovery, please visit http://www.apple.com/macosx/recovery/.

The MacBook Air EFI Update will update the EFI firmware on your notebook computer. Your computer's power cord must be connected and plugged into a working power source. When your MacBookAir restarts, a gray screen will appear with a status bar to indicate the progress of the update. It will take several minutes for the update to complete. Do not disturb or shut off the power on your MacBookAir during this update.

We noted last week that the new Apple Thunderbolt Display was beginning to ship to stores in anticipation of a launch in the near future, and today's release to ensure compatibility with the new MacBook Air offers further evidence that a launch for the display is near.

Apple announced the display back in July with a shipping date of "within 60 days", a timeframe that is rapidly approaching. Apple's order page for the $999 display is showing a 2-3 week estimate for new orders, but earlier pre-orders will likely ship sooner than that. We have yet to hear, however, of any pre-orders being prepared for shipment.

With a flurry of new hardware releases appearing alongside OS X Lion today, here are a few notes of interest that we wanted to make sure our readers noticed:

OS X Lion

- While Apple initially touted OS X Lion as being a Mac App Store exclusive, the company announced today that the new operating system will also be made available on a USB thumb drive beginning next month. The thumb drive option will be priced at $69, compared to $29.99 for Mac App Store distribution.

- Beginning with the MacBook Air and Mac mini released today, new Apple hardware will support Internet Recovery, allowing users to install OS X Lion onto blank hard drives in the event of hard drive replacement due to failure or upgrades.

Mac mini

- The updated Mac mini omits an optical drive, joining the MacBook Air in Apple's efforts to slim down its hardware and push digital software distribution. Users requiring optical disc capabilities for their new Mac minis can either use Remote Disc capabilities to wirelessly use the optical drive of another computer or purchase an external SuperDrive.

- The new Mac mini offers discrete graphics on the high-end model, utilizing the AMD Radeon HD 6630M and offering up to twice the graphics performance of the previous generation. The low-end and server Mac mini models utilize integrated graphics in the form of Intel HD Graphics 3000.

- Pricing for the Mac mini returns to $599 for the low-end model after having been bumped up to $699 with the redesign on the previous generation.


MacBook Air

- As had been rumored, the updated MacBook Air sees the return of the backlit keyboard. The feature had been present in the original MacBook Air, but was not included in the initial redesigned form factor released last October.

- Both the new Mac mini and MacBook Air support Bluetooth 4.0, a new specification that offers ultra low-power data transfer and has been touted as opening the door to a host of new wireless peripheral devices.

Apple Thunderbolt Display

- Apple's forthcoming Thunderbolt display, shipping within the next 60 days, is being positioned as an "ultimate docking station". The display uses a single Thunderbolt connection to support FaceTime camera, audio, USB, Firewire 800 and Ethernet through the display.

MacBook

- Apple's white polycarbonate MacBook has been discontinued for general purchase and is now only available to educational institutions.

Earlier this week, part numbers for upcoming Apple hardware updates surfaced, with claims that the parts represented new MacBook Air and Mac Pro models. While the MacBook Air part numbers are believed to be legitimate, the claim regarding the "Mac Pro" part numbers was later revised to state that they referred to new Mac mini and MacBook models.

But even that revised assertion isn't entirely correct, as while the Mac mini numbers are assumed to be correct, the part number ascribed to a new MacBook is in fact for a new Thunderbolt-enabled LED Cinema Display.


Apple has even confirmed that information by prematurely posting a new image on its site depicting the display and identifying it in the URL as the "MC914" part that had been previously thought to be a new MacBook. The display appears essentially identical to the existing LED Cinema Display from the front, although Apple's new promotional image displays a Lion desktop background rather than the Snow Leopard one found on the images for the current model. The rear of the display will obviously include a Thunderbolt port in place of the current mini DisplayPort connection.


Additional gallery images also show the new display paired with a number of Apple's Mac products, all of which show the same form factor as the current models, suggesting that the Mac mini scheduled to appear alongside the new display (which appears here as the Mac Mini Server model) will retain its current form factor. Apple's Mac Pro has been rumored to see a redesign, but appears set to debut a few weeks later than the new display, meaning that Apple would need to continue showing the new display alongside the current Mac Pro until that time. Consequently, the new image showing the Mac Pro likely offers no insight into whether or not the Mac Pro will be seeing a redesign.

Thanks, Ben!

Update: We've spotted a new image depicting a MacBook Pro connected to two LED Cinema Displays daisy-chained via Thunderbolt. This feature would only be compatible with 15-inch and 17-inch MacBook Pros of the current generation supporting Thunderbolt.


Update 2: While not revealing any new products, a number of images of Apple's existing products are also starting to be updated in Apple's online stores to show the Lion desktop background instead of the Snow Leopard one. For example, Apple's iMac page has had its graphics updated to show a Lion desktop, while other machines elsewhere in the store are still showing Snow Leopard.


Thanks, Nicholas!

Update 3: The 27" LED Cinema Display seems to have been removed from the Apple Online Store. Clicking "Buy Now" from the Apple Cinema Display page results in a broken link. Additionally, all the images shown above have been removed from Apple's website as well.

Update 4: The LED Cinema Display is back on the store.

AppleInsider reports that it has received word that Apple is holding back on releasing updated Mac models in order to wait for work on OS X Lion to be completed. Apple is reportedly "so pumped up" about Lion that it wants to ship the new machines with Lion preinstalled rather than forcing users to upgrade on their own once the new operating system is released next month.

For instance, new Thunderbolt-enabled Sandy Bridge MacBook Air models expected to go into production this month have been ready and waiting for some time, according to people familiar with the matter. But management is currently unwilling to usher the new models into the market with the current Mac OS X 10.6 Snow Leopard operating system.

Instead, the Mac maker is said to be locked on waiting till it can image the new notebooks with a Gold Master build of Lion so that buyers are afforded the latest and greatest Apple experience.

Thunderbolt-equipped Mac minis and LED Cinema Displays are also said to be on hold as Apple puts the finishing touches on OS X Lion.


Apple has only announced that OS X Lion will launch in July, declining to share an exact release date so far. The release will be a Mac App Store exclusive, and will be priced at $29.99. Through the Lion Up-to-Date program, users who purchase or have purchased a Mac between June 6th and the official Lion release will receive a free upgrade to Lion.

Consequently, Apple's desire to hold back on releasing updated Macs is not related to saving customers money on the upgrade but instead seems focused on offering customers the latest and greatest software experience right out of the box and removing any inconvenience associated with upgrading.

Electronista over the weekend noted a growing thread in the Apple Discussions forum regarding flickering issues being experienced by users of the new MacBook Pro paired with a 24-inch LED Cinema Display. A couple of users in our own forums have also reported the issue.

Both the 13- and 15-inch models, and likely the 17-inch model, produce intermittent flickering, brief blackouts and other periodic but noticeable flaws when attached to the out-of-sale screen. The built-in notebook display is unaffected.

Users have already tried some of the more common tricks, such as resetting the SMC, but haven't had any initial success. It also applies whether or not the AMD or Intel graphics are being used.

The Apple Discussions thread has continued to grow in the days following the original report, with at least one user reporting experiencing the issue with a 17-inch MacBook Pro.

Apple support staff are reportedly investigating the issue, having swapped out one user's affected machine specifically to examine a unit known to be experiencing problems.

Well, it appears Apple is aware of the issue. An Apple Discussions Host called me a few days ago after seeing one of my recent posts. He offered to swap my MacBook Pro for a new one so Apple Engineers can get their hands on a known bad unit. I shipped it off last night and anxiously await my replacement.

Apple officially discontinued the 24-inch LED Cinema Display last July alongside the introduction of a new 27-inch model, but the company did continue to sell off its remaining stock for some time after the discontinuation.

Update: French site MacGeneration has posted a video showing the issue. The flicker occurs at about 1:45 in the video.

Apple yesterday released LED Cinema Display Firmware Update 1.0, addressing audio problems with the company's latest standalone display.

This Firmware Update addresses intermittent audio issues some users have experienced while using the 27-inch LED Cinema Display.

The updater application will be installed in the /Applications/Utilities folder and will be launched automatically. Please follow the instructions in the updater application to complete the update process.

Details of the issue are included in an associated support document:

You may notice that sound from an LED Cinema Display (27-inch) connected to a Mac intermittently becomes inaudible. In some circumstances, you may need to unplug the display and reconnect it or restart the Mac before the sound becomes audible again.

The update weighs in at 957 KB and requires either Mac OS X 10.6.4 plus the LED Cinema Display Software Update 1.0 or Mac OS X 10.6.5 or later.

As we noted earlier today, software updates released by Apple today indicated that the release of the company's new 27-inch LED Cinema Display appeared imminent. We can now push things one step further, as customers have begun receiving shipping notices for their orders, some with delivery set for as early as tomorrow.


Apple's shipping department is also gearing up to start pushing out the new Apple TVs as well, as we've heard from a number of customers who have seen their credit cards being charged for their orders, a sign that shipment should occur in the very near future.

Availability of Apple's new 27" LED Cinema Display appears imminent, as the company has just released several software updates to support the new display. The new display went on sale last Friday with estimated shipping times of 1-2 weeks, a timeframe that still holds for new orders as of today.


LED Cinema Display Software Update 1.0 weighs in at 75.79 MB and requires Mac OS X 10.6.4. According to a support document for the release, the update makes several tweaks to users' System Preferences options for the new display, including for ambient light sensor settings and for routing sound output to the display's speakers.

For Windows users, Apple has expanded its driver package for the Magic Trackpad to also include support for the new display. The update appears set to come in 32-bit and 64-bit versions, although all of Apple's pages have not yet been updated to properly reflect the revised version just now coming available.