Currently Being ModeratedJul 13, 2012 11:59 AM (in response to chinhster)
Having the same problem on a brand new AOC monitor and MBA 13". Monitor would display fuzz occasionally on a clean boot as well as after waking up from sleep.
From the research I've done over on Audio Video forums, people were indicating the same issues when connecting Apple products running OSX Lion to video scalers and switching hardware. The white snow that you see is the encrypted HDCP data not being decrypted properly. Basically the Apple hardware detects an HDCP compliant video device, but the handshake is not happening correctly.
I went back to Amazon and looked at the cable (not adapter) that I purchased. I purchased a cable for a nice clean look, so I wouldn't have an adapter dongle hanging off the side of the laptop. Had I read the one negative review about the cable I would have learned that the Apple hardware with the Thunderbolt interface and OSX Lion does not work with this cable. Now my knee jerk reaction is that there shouldn't be a difference between a mini DP (Thunderbolt) to HDMI cable versus an adapter. Well, according to the review, there is and this cable "cannot be tested for compliance or interoperability using the HDMI CTS" and "cannot be assured that products using this cable will work as expected". Furthermore, "HDMI licensing has informed select manufacturers of DisplayPort and Mini DisplayPort to HDMI cables of the non-compliance status of their products, but did not ask for a recall yet".
I have borrowed an adapter from elsewhere and hope this will resolve the problem. I will update this post when I confirm or deny this. I suppose that there is a possibility that even my borrowed adapter may have the same issue, but we'll see. I did read in a thread somewhere on Apple discussion boards that somebody had this issue even with a genuine apple adapter, so that doesn't make much sense. Maybe it is an older one that does not meet HDMI/HDCP specifications? I know others mentioned using appliances that can emulate a non HDCP compliant display (which also helps keep the HDMI link alive) to strip out the HDCP signal and thus resolve the issue, however those devices can be costly. I'm wondering if there are a bunch of cables and adapters that just simply have issues like this?
Question - how many of us are using "cables" versus "adapters" where you have to supply your own HDMI or DVI-D cable? Are they new/old, name brand or off brand?
I hope this all works out when I get home and will update this post as I find more information. Cross your fingers for me!
Currently Being ModeratedJul 13, 2012 1:28 PM (in response to vixhex)
Ok - I swapped out the "cable" for an "adapter" and I have not had the problem at all. The adapter was just a cheapo one purchased from Amazon. I used an HDMI cable that I bought at Fry's for $3.
I can let the Mac sleep, open and close the lid, run it in clamshell mode, reboot, and haven't had a single glitch since.
Now I hope I didn't jinx myself and the problem will come back later, but it's never worked this long before without issue, so I'll tentatively chalk it up to an incompatible cable.
Go figure . . . just glad that it appears to be working properly now.
Currently Being ModeratedJul 13, 2012 1:51 PM (in response to vixhex)
you realize we're not using macs with lids in this forum, right - just towers. but seems somethings are the same or don't change.
I can let the Mac sleep, open and close the lid, run it in clamshell mode, reboot, and haven't had a single glitch since. https://discussions.apple.com/community/notebooks/macbook_pro
Currently Being ModeratedJul 13, 2012 2:23 PM (in response to The hatter)
Oops - I apologize the crosspost and not catching it was the Mac Pro and not Macbook Pro or other forum. In my defense there are no fewer than a dozen threads of this nature spread across all of the product forums. I had a bunch of pages open and posted to the wrong one, although, they all converge on HDCP issues so the information could point somebody in the right direction.
Nonetheless, I'm sure there are people in this thread who have devices with lids and a similar problem who could benefit. At the end of the day, the problem seems to be hardware agnostic, so who knows . . . maybe a cheapo cable could be the fix for somebody running a tower? I didn't believe it myself until I saw it today.
Currently Being ModeratedJul 13, 2012 2:28 PM (in response to vixhex)
Not sure if I'm talking about the same thing, but adapting the HDMI port on the back of my early '09 Mac Pro down to the VGA port on my monitor does indeed get rid of the static problem. I'm just not happy with the resulting display quality. My monitor also has an HDMI port. I want to connect HDMI to it, end of story.
We need to keep demanding that stuff work to spec here. For the money we pay for Apple stuff, we're entitled to it. Even if we don't get it.
This machine is now more than 3 years old, and I've been complaining about the static problem since it was brand new. Not only here, but on a tech support ticket that Apple just dropped after about 18 months without a word of explanation. At this point it's looking like a permanent "design feature" that they won't be fixing.
The really galling thing about it is that the static issue never comes up when I'm running the machine in Windows 7 and Bootcamp, which I sometimes do for weeks on end, so I know this isn't a hardware issue. It's some kind of bug in the OS X display driver that has persisted across at least two major releases and umpteen minor releases. Apple knows it's there, and simply refuses to do anything about it.
Currently Being ModeratedJul 13, 2012 2:50 PM (in response to MR17)
Yep - similar problem on different hardware. When you convert HDMI to VGA you are essentially losing the digital picture signal and all of the other things that come with it (HDCP, DDC/CI, Audio, etc). That is why you don't see the static snow with that configuration. Same goes with your bootcamp findings. Windows is not handling the HDMI handshake with the monitor and video hardware the same way OSX does, thus you don't have the problem.
From what I've seen in the past 24 hours since I started looking in to this, the problem lies with how OSX detects your monitor (which is likely HDCP capable) and cannot communicate correctly with it. In the end, it turns out that I bought a cable that was "incompatible" and didn't conform to HDMI industry specifications. Trust me, I'm not the sucker that buys "monster HDMI cables" but there is some validity in not all being created equal. Not saying a simple cable swap will be your savior, but the static/snow is certainly something to do with HDCP, so you either need to strip it out, or get it to work right. Reminds me of the early days of HDMI when people couldn't get their newer DirecTV boxes to handshake with 1st generation HDMI TV sets or receivers.
I agree that there is likely something that could be done in the way that the software handles this issue, but the wheels have been spinning for almost 4 years now on this topic. I wasn't keen on returning my brand new monitor or living with the issue and constant reboots and replugs of cables, so I wasn't going to sit around for an answer.
There is an Apple troubleshooting page somewhere that suggests a variety of different things like creating a new user, swapping cables, and rebooting, but those are just status quo type responses. I get it . . . there are a thousand different monitor, cable, and computer manufacturers and not everything will work 100% of the time, but things like this can be frustrating unless the community figures it out themselves.
Maybe try a cheaper HDMI cable, or a more expensive one. Or look in to the signal boxes that tweak HDMI that others posted about earlier in this thread (they can disable HDCP via a dip switch, but are expensive). Maybe try an HDMI to DVI cable? Unfortunately, without some kind of software fix, the solution will be up to each individual to track down. Hope you get it resolved sooner than later - I was upset after only 24 hours of living with it . . . couldn't imagine 3 years!
Currently Being ModeratedSep 3, 2013 10:04 AM (in response to chinhster)
Replacing the DVI cable solved the problem for me. The guy at the Genius Bar said even without stress on the cable they often fail. Lots of electrons flowing through.
Currently Being ModeratedDec 16, 2013 3:54 PM (in response to tnp612)
Just to add to this one:
I have an early 2009 Mac Pro, and I have used it with a Dell 3007WFP 30" monitor with never a problem.
I was getting board of waiting for the new Mac Pro so I decided to 'pimp my ride' somewhat. I added an SSD for the boot drive, some more RAM, and picked up a second user ATI Radeon HD 5870 1Gb to replace the old Nvidia card that was shipped with the machine.
Straight away I am getting this problem - and it's really annoying. all I have to do is flip the display on and off and everything comes back - but it can be really frustrating. This problem can happen at any time in OSX. I can work for hours with no issue, and then it will come back every minute or so for five or six minutes. It never happens when running Windows in Boot camp however.
I haven't tried changing the DVI cable yet - but since the one with the monitor is fairly long - I wonder if a new shorter one would improve things.... Hmmm ?
Message was edited by: Mike Antrum to correct his absolutely appalling spelling.
Currently Being ModeratedDec 16, 2013 5:19 PM (in response to Mike Antrum)
Hi Mike Antrum, what was the exact model of your old nvidia card? Just curious. Was it a GT 120?
I bought a replacement cable that appeard to make some difference but not 100%.
I'm curious if a really short cable is the trick too.
Currently Being ModeratedDec 17, 2013 3:13 AM (in response to chinhster)
Same behaviour on a new 2013 13" MBP Retina, two monitors, different makes, three cables, different makes, all aftermarket.
One is Displayport->DVI, the other is HDMI->DVI.
Almost fails every time it comes out of screenlock. Sometimes it corrects itself after 15 seconds or so, sometimes I need to turn the monitor on and off.
The HDMI->DVI does it almost 100% of the time.
I'm setting my monitors to not turn off when the screen locks. Waste of power, but it's a workaround.
Currently Being ModeratedDec 20, 2013 2:15 PM (in response to chinhster)
What works for me is when the snow shows up after sleep I put the computer to sleep briefly by clicking on your keyboard Option, Command and the Eject key on an Apple keyboard. Once asleep click your mouse the computer wakes up with a perfect screen again. This now works for me EVERY TIME! I have been dealing with this issue for years and stumbled on this very quick solution. Best Of Luck To All!