21525 Views 33 Replies Latest reply: Aug 1, 2012 1:41 PM by berlindude
Currently Being ModeratedNov 14, 2010 2:14 PM (in response to kevinnnnnnn)Looking through reviews, I see plenty more successful MBP13"+U2711 combinations, also older (2008, 2009) MBP 15" + U2711, but no 2010 MBP 15" + U2711.
On this page http://forums.macrumors.com/showthread.php?t=921932 at least one other person reports the same problem as me (4th post down; and there's a second, but seemingly different, complaint near the bottom of the page).MacBook Pro 15", Mac OS X (10.6.4)
Currently Being ModeratedNov 17, 2010 2:41 AM (in response to kevinnnnnnn)I have the same setup and the same problems. Also tried with the expensive Dual DVI-converter but that also has problems ("white noise" on screen, not the same flickering).
I've tried it with two different Macbook Pros, both from 2010, one Core Duo and on i7.
I'm running a linux box at maximum resolution on the same monitor so it should work.
ErikMacbook Pro 17, Mac OS X (10.6.4)
Currently Being ModeratedNov 19, 2010 10:14 AM (in response to erikstarck)Thanks for letting me know about the d-DVI cable! Even though it gets awful reviews, it was on my to-try list... You saved me $99 .
Also glad to hear you tried different MBP15". I guess that between the two of us, we've tried more or less all possible configurations?
Have you been able to talk to anyone knowledgeable at Apple? I've apparently exceeded my 90 day grace period for support but will still try to call (not paying though). The Apple store in my city is awful; there's another Mac store that's good, but I doubt they'll be able to help me any more than they already have. (I suppose I could take in the monitor and ask them if they can run it somehow?)
Let me know if you find any sort of solution! It's encouraging that it works on linux.
KevinMacBook Pro 15", Mac OS X (10.6.4)
Currently Being ModeratedNov 21, 2010 9:04 AM (in response to kevinnnnnnn)Can you describe what you mean by flickering a little better? Flickering can mean a lot of things. For example, some people that didn't know their MBP had an ambient light sensor said they noticed "flickering" in their screen, which meant in this case the full screen brightness was modulating up and down slightly because the light sensor was detecting differences in the amount of room light.
There have been other cases where people's whole screen would blink out to full blackness for a brief period, like a fraction of a second, and then come right back on. That was also called "flickering". So a better description would be helpful.
Currently Being ModeratedNov 22, 2010 4:40 PM (in response to BSteely)Hi BSteely,
Thanks for taking interest in our problem. I've posted some material here :
First picture: monitor settings as recognized by 2010 mbp 13" (notice PCI)
Second picture: monitor settings as recognized by 2010 mbp 15" (notice PCIexpress)
Movie: I connect the U2711 monitor to my mbp15 and it flickers; then I connect it to the mbp13 and it looks great. (quicktime .mov format)
All of this at native resolution (2560x1440) using a minidisplayport-to-displayport cable.
If you have further requests, I can take more pictures/movies in a few days (I'm away from home right now).
I welcome any ideas and suggestions!
Thanks very much to anyone reading this,
KevinMacBook Pro 15", Mac OS X (10.6.4)
Currently Being ModeratedNov 22, 2010 10:40 PM (in response to kevinnnnnnn)OK, now I see what flickering means in this case. Kind of a long shot, but does having the power adapter disconnected from the Mac make any difference?
Also, does in make a difference if you switch to the Intel graphics processor instead of the 330M?
Currently Being ModeratedNov 23, 2010 12:46 PM (in response to BSteely)Thanks for writing again and for offering suggestions.
I've tried all the combinations (power/battery and 330m/intel) and none work. There has been some variation in the amount of flickering but it never stopped being annoying. I'll record these things over the next days (might as well document the issue properly) but don't expect to see more than variations in the amount of flickering.
Also, at 1920x1080 resolution, everything works great, and I can play bluray on the external monitor even while the laptop is on battery. (Well, the macbook always runs out of steam after a while, whether on power or on laptop, but that is to be expected given the huge amounts of data involved - too bad we can't get more vram without choosing the i7.)
(I have also tried some other things like making sure wall sockets aren't shared, no other devices are causing interference, etc. Someone has suggested I try a shorter cable. However, the fact that the MBP13" had no problems more or less rules out all external factors.)
As an aside, I wonder what the best way might be to inform apple's customer service? From dealing with other companies (no apple experience here) I rather dread the challenge of explaining all this to half a dozen clueless cs people in the hope of reaching someone with the necessary technical skills. Of course, it'd be even better if we could solve it here!MacBook Pro 15", Mac OS X (10.6.4)
Currently Being ModeratedNov 30, 2010 10:59 AM (in response to kevinnnnnnn)Hi,
Did you ever get this resolved? I just took delivery of a U2711 yesterday and am using it with my late '09 MBP 17. I noticed a flicker too when I first plugged it in when the notebook was on, but after I rebooted the MBP for another reason, I didn't notice any flicker all evening and it displayed it's native resolution fine while I had the MBP at 1920x1080.
KenMacBook Pro 17" 3 Ghz,, Mac OS X (10.6.1)
Currently Being ModeratedDec 2, 2010 5:52 PM (in response to KenOnBass)This (http://learntoduck.com/techsupport/dual-link-dvi-adapter-macbook-pro) fixed it for me. Woohoo!MacBook Pro 17" 3 Ghz,, Mac OS X (10.6.1)
Currently Being ModeratedDec 6, 2010 7:19 PM (in response to KenOnBass)Hi,
thanks very much for taking an interest and sharing your experiences. I'm glad your problem seems to have been resolved.
For me, none of the tricks you mention really solve the problem. As far as I understand, all of them come down to forcing the macbook pro to use the nvidia graphics (instead of integrated graphics) to run the monitor. When I do this, the amount of flickering is reduced dramatically, but it's still there - instead of constant flickers, I get them usually a couple times a minute, sometimes a few minutes in between. While that's an improvement, it's still very annoying, and distracts from doing work or watching movies.
Again, the MPB 13 doesn't have this problem in any circumstance.
I've posted a little video illustrating this: http://picasaweb.google.com/kevinjorissenpdx/ComputerProblems20101008?authkey=Gv1sRgCPad7e7M3qas-QE# and choose the last file.
You'll see the screen flicker like crazy, then I press shift-control-eject, which puts the screen to sleep, then I wake it up again - the mbp now knows it has to be on nvidia just as after you rebooted - and in the remaining minute or so, you can see it flicker twice (this is boring to wait for ;)), of course it did it again right after I switched off the camera . This is a 'best case' ; usually, the disturbances come every 15-20 seconds. I don't know why it varies.
if BSteely or anyone else has a way of submitting my reports to Apple, please go ahead. I'd like to finally get my monitor working right ...
(As an aside, I've noticed that 'Spaces' (with 4 desktops enabled, as is standard) and the external monitor don't work together smoothly & seem to get confused.)MacBook Pro 15", Mac OS X (10.6.4)
Currently Being ModeratedDec 7, 2010 12:17 PM (in response to kevinnnnnnn)Sorry that didn't work for you. I changed the power management settings to Graphic performance and it worked fine with two different U2711 monitors. Did you check to see if the power management changes stayed in place or did they revert back to the factory setting? Yes, you want it to run off the PCIe. As a next step, I guess I'd take it to the Mac Store and try it with an ACD 27 and see if the same thing happens.MacBook Pro 17" 3 Ghz, 8GB RAM, Mac OS X (10.6.1)
Currently Being ModeratedDec 8, 2010 7:27 PM (in response to KenOnBass)Hi Ken,
I have taken the MBP to the store and hooked it up to an ACD - no problems at all, worked perfectly. Thanks for the suggestion though.
KevinMacBook Pro 15", Mac OS X (10.6.4)
Currently Being ModeratedDec 13, 2010 8:42 PM (in response to kevinnnnnnn)can anyone help?MacBook Pro 15", Mac OS X (10.6.4)
Currently Being ModeratedDec 16, 2010 6:17 AM (in response to kevinnnnnnn)I watched the flicker video above and mine does -not- do that.
I have been using my MBP 15" (latest version) with the U2711 for ~5 months at full resolution using a mini-Displayport to Displayport cable (no adapter).
Starting this morning however, after a freeze and hard reboot (holding Power button), the MBP no longer sees the U2711. I tried resetting PRAM and SMC but these didn't correct it. Doing Command+F2 makes the monitor turn the LEDs blue for a bit, but then it re-enters powersave mode.MBP 15" i7, iPod Touch 4G