Strobing Screen on MBA (all brightness levels)

I seem to have gotten a Mac with all of the above.
Losing WiFi connection, and not being able to turn WiFi back on.
Screen randomly going black after sleep
And now the new addition to the list:
Screen flickering at approx 25 frames per second on all brightness levels on both battery and. Restarting randomly fixes the problem, randomly does nothing. I have reset the SMC / PRAM. Seems this otherwise beautiful baby is going back .
Add yourself to the thread if you're experiencing the strobing effect.

I have the same strobbing or pulsing back light problem. I really regret getting this new MBA. The 2010 model had none of these issues. My laptop doesn't wake from sleep randomly, when it does it takes forever to actually resume and now this black screen with the flashing backlight. Apple needs to address all these issues ASAP or I'm going to ask to return this thing for a refund!

Similar Messages

The screen on my macbook has malfunction. When I change the brightness to zero and return to the first level of brightness it works briefly but then the screen starts to flicker brightness and quickly extinguished.

The screen on my macbook has malfunction. When I change the brightness to zero and return to the first level of brightness it works briefly but then the screen starts to flicker brightness and quickly extinguished. It seems to be a bad contact, it would not be normal for a quality product that should have, he has less than two years of use. Not because of the bad use or crash. Someone with the same problem or can help me? It's really a contact problem? I've done all the procedures recommended by the online support. Thanks.

Hey everyone in Apple world!
I figured out how to fix the flashing yellow screen problem that I've been having on my MBP! Yessssss!!!
I found this super handy website with the golden answer: http://support.apple.com/kb/HT1379
I followed the instructions on this page and here's what I did:
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
I went through the 6 steps above twice, just to make sure I got rid of whatever stuff was holding up my bootup process. Since I did that, my MBP boots up just like normal. No flashing yellow screen anymore!!
(Note that I arrived at this solution when I first saw this page: http://support.apple.com/kb/TS2570?viewlocale=en_US)
Let me know if this works for you!
Elaine

Screen goes back to lowest brightness level after wakeup

Hello All,
My late 2002 Titanium Powerbook screen sometimes goes to the lowest brightness level after wakeup when the lid has been closed. I manually have to reset the level again. Does anyone know why the level is not staying to my original setting? Do you think there's a corruption in the wakeup mode function? Just a hunch, though. Any input is much appreciated. Have a great day.
Jack
iMac G5 20, 2 GHz, 1.5 GB RAM Mac OS X (10.4.8) Powerbook 15" Titanium (late 2002) 1 gHz, 1 gig RAM, 60 gig HD, OS X 10.4.8

Hi TJK,
I just did a permission repair with disk utility to eliminate any other issues. I'll create a new user and give your suggestion a try. It makes sense since I recently got this machine used from another owner. I've nothing to lose, I suppose.
While I'm here, would a clean install eliminate the issue I'm having? I'm not too excited about having his name on my Home folder permanently, anyway. I've no problem doing a clean install, and I've got the original install disks.
Best regards,
Jack
iMac G5 20, 2 GHz, 1.5 GB RAM Mac OS X (10.4.8) Powerbook 15" Titanium (late 2002) 1 gHz, 1 gig RAM, 60 gig HD, OS X 10.4.8

[SOLVED] Different brightness level after blank screen

Hello!
I have KDE on laptop ASUS k50ij (intel gma 4500m).
My problem is that when my screen goes blank after 15 minutes the brightness level is different when it was before blanking. In system preferences in power mangement i have disabled "Display brightness". For info, i have udev rule which set up my brightness level to 2 on battery and 3 on AC (yes i know, i like my backlight to be dark).
My udev script regarding brightness on AC:
echo 3 > /sys/class/backlight/acpi_video0/brightness
On battery:
echo 2 > /sys/class/backlight/acpi_video0/brightness
xset q:
Keyboard Control:
auto repeat: on key click percent: 0 LED mask: 00000000
XKB indicators:
00: Caps Lock: off 01: Num Lock: off 02: Scroll Lock: off
03: Compose: off 04: Kana: off 05: Sleep: off
06: Suspend: off 07: Mute: off 08: Misc: off
09: Mail: off 10: Charging: off 11: Shift Lock: off
12: Group 2: off 13: Mouse Keys: off
auto repeat delay: 660 repeat rate: 25
auto repeating keys: 00ffffffdffffbbf
fadfffefffedffff
9fffffffffffffff
fff7ffffffffffff
bell percent: 50 bell pitch: 400 bell duration: 100
Pointer Control:
acceleration: 20/10 threshold: 2
Screen Saver:
prefer blanking: yes allow exposures: yes
timeout: 0 cycle: 600
Colors:
default colormap: 0x20 BlackPixel: 0x0 WhitePixel: 0xffffff
Font Path:
/usr/share/fonts/misc/,/usr/share/fonts/TTF/,/usr/share/fonts/Type1/,/usr/share/fonts/100dpi/,/usr/share/fonts/75dpi/,built-ins
DPMS (Energy Star):
Standby: 900 Suspend: 1350 Off: 1800
DPMS is Enabled
Monitor is On
I think the problem is there forever but i have noticed it just recently because i want to have lower brightness.
Thanks for any tip!
EDIT: SOLVED by putting "xbacklight -set 6" in /usr/share/config/kdm/Xsetup according to wiki.
Last edited by Shark (2013-01-22 09:59:29)

berbae wrote:
kdm uses:
/usr/share/config/kdm/Xsetup
which is 'A program to run before the greeter is shown...'
according to comments in kdmrc.
You may try to write your xbacklight command in it.
That's exactly it, many thanks!

Screen problems - Horizontal gradient brightness - Satellite R25 Tablet

Hello all
I have some strange problem with my screen. When I use two lowest brightness levels my screen is not constantly bright it has horizontal gradient. Looking from left side I have very dark screen, near middle there is normal brightness, after middle dark again and in the end/right side o screen it's bright.
This anomaly is most notified only on two lowest levels of brightness, when I want to extend my battery life time.
I was replacing my Windows XP but without any positive result.
Does the screen need to be replaced, or is there another way to fix it?

I am afraid it is hardware issue. I cannot say for sure that display is defective but if you bring it to the service technician can test it with special diagnostic tools.
As you can see fresh OS installation didnt help and it cannot be software problem. Sorry but I don't believe there is anything you can do alone to fix it. If possible continue to use display with acceptable brightness level.

New iMac brightness level keeps changing (auto adjust NOT checked)

Just got a new 27 inch iMac and keep on having to change the brightness level back to the brightness I prefer.
I do not have auto adjust checked, I put the brightness slider up to the level I like and after a while the brightness dims to what seems like the default level as its always down to the same spot on the slider...what gives? i just want it to stay where I want it...
Help.

I have same problem, of autobrightness being unchecked and my brightness going from full to about 3/4 bright
all by itself. I had that problem, then flickering of my screen also was taking place. I didn't bring my unit into Apple
because this autobrightness thing plus flickering would not happen on command,, and I wouldn't be able to show them properly. Well , finally my left side of the screen dimmed,, and that was the go ahead to bring it in to them
to show the left side of screen. I also told them about the flickering,, and the autobrightness, which I figured played a role into the final left side dimming. They replaced the backlight and the display LCD on warranty.
I have had it for about 5 days. The screen is equally lit (as should be), however, I discovered that my same old
problem of autobrightness, is slipping back to 3/4. So most of you have autobrightness problem in a sort of different way. I set mine to "torch" because my downstairs bedroom is dim (with one overhead light), but sometimes, just plain dark,, so I want to sometimes keep it at torch,, however, it still slips back. You would
almost think that if my surronding was dim or dark, that it would stay on torch if the autobrightness was really working properly. Go figure. I just tried SMC a short while ago,, I had tried, before my repair doing PRAM and the other one (I think VRAM). I also will unhook my second monitor to see if that is having an impact on things.
Do any of you in this post have a second monitor attached,, and have you tried unhooking it to see if the problem
is resolved?

Spasming brightness level

Every now and then, this thing happens on my W701ds, where I open the lid (I have it set so that it does nothing on closing the lid...so it's not coming out of sleep or anything) and the screen brightness level starts twitching back and forth between two settings (like between 10 and 11). The only way to get it to stop, is to hold down one of the brightness Fn keys to push the level all the way to the min or max.
Has anyone else seen this? I searched and couldn't find anything, but maybe it's been described differently. It's fairly spectacular, so I have to imagine someone else has posted about it.
I'm not even sure what to target as being responsible for this. It does seem like it normally adjusts its brightness to the abient light level, I assume using the same sensor as for color calibration. Is it HueyPro that does this or some other system component?
This may be unrelated, but occasionally when I open the lid it comes up with an odd colored cast to it for a second or so, as if it is adjusting the colors, though I didn't think that was supposed to be happening automatically.
If anyone can give me any clues about how this stuff works / is supposed to work, I'd appreciate it.
Thanks,
Eric

This also happens without lifting the lid...if the monitor gets shutoff to save power if I have not touched it in a little while, it sometimes goes into spasm mode when I move the mouse and it turns the monitor back on. Which brings me to theorize a cause:
I suspect that the power manager which adjust the brightness level according to your power scheme (such as to turn the monitor on or off or adjust brightness differently for powered vs battery) ends up "fighting" with the component (HueyPro, I believe) that is changing the brightness level for room light compensation. I think it happens when the room light level has changed between when powermanager turned off the monitor, and when it turned it back on.
If so, its not clear which of these components is at fault or if it is something at a deeper system level that should be coordinating between them.

Latest Update breaks brightness level in iMac

Everytime I restart, the brightness level jacks up to 100% The effective brightness I have calibrated for is on 0% This started happening directly after the latest 10.5 update. Its annoying to reset it everytime I restart.
I have a 17" 2006 imac. The first intel one.

I would try both a PRAM and an SMC reset.
PRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.>
SMC
1. From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
2. Unplug all cables from the computer, including the power cord and any display cables.
3. Wait at least 15 seconds.
4. Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer.
5. Press the power button on the back to start up your computer.
Dah•veed

Cant change nokia c1-01 brightness level....

I can`t change the brightness level of Nokia c1-01? I cant finf this option in my phone, pls chek it in update

you cant change the screen brightness on this model
If i have helped at all a click on the white star below would be nice thanks.
Now using the Lumia 1520

The Display Brightness Level

Good morning! In order to minimise the screen buzz we all know by now that increasing the brightness level to maximum helps.
This is an intermediate solution and not a long term one.
My question is until I decide to send the notebook for a repair for the inverter, howmuch damage would I inflict on the display by keeping it at maximum, if at all??
Thanks and regards.

The machine is designed to let you adjust the display to any available brightness. Since this is 'within specs', you will not damage it if brightness is up all the way constantly.

Cannot adjust brightness levels

I have an HP Envy 14 Notebook and as of recently, I cannot lower or higher my brightness settings. This laptop has Windows 7 Home Premium installed.
I recently updated my graphics card, or rather, the AMD Catalyst Control Center. Before installing that, the brightness control was working perfectly fine. Afterwards, it just stayed on 100% brightness and its killing my eyes. I tried going in to Control Panel > Device Manager > Monitor > Generic PnP Monitor > Uninstall > Scan for hardware changes, nothing worked. I tried adjusting the brightness level from both AMD CCC and Intel(R) HD Graphics, nothing. I tried booting up in to safe mode, still the brightness settings would not change. As it is right now, because I cannot stand the insanely bright screen I had to go in to CCC > My built-in displays > display color > Contrast to 20. It definitely dimmed the screen by a lot, and I can see a lot better now but my eyes still somewhat hurt from the incredibly bright light. Its a workaround, but I rather have this solved than have a workaround.
And the whole reason why I even updated the graphics card was because I continously have stutter when playing games and during cutscenes, but it seems that problem is still around...

Hi ZeroArmada,
Thank you for visiting the HP Support Forums and Welcome. I have read your thread on your HP ENVY 14 Notebook and getting a blank or black screen on startup. Try performing a hard reset. When performing a hard reset please note remove any and all USB devices, and remove memory cards from the card reader slot. Disconnect all non-essential devices. If that does not help try to turn on the computer you start to press F11 repeatedly till the menu opens. You can do a system restore. Here is a link to a document on how to rollback drivers in the device manager.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

CS4 NOT capable of sharp displays at all zoom levels

I must have been asleep, until now, and missed the significance and importance of what follows.
In post #11 here:
http://forums.adobe.com/thread/375478?tstart=30
on 19 March 2009 Chris Cox (Adobe Photoshop Engineer - his title on the old forums) said this, in a discussion regarding sharpness in CS4:
"You can't have perfectly sharp images at all zoom levels.". Unfortunately, my experience with CS4 since its release late last year has repeatedly confirmed the correctness of this statement.
What makes this statement so disturbing is that it contradicts an overwhelming amount of the pre- and post-release promotional advertising of CS4 by Adobe, to the effect that the OpenGL features of CS4 enable it to display sharp images at all zoom levels and magnifications. What is surprising is that this assertion has been picked up and regurgitated in commentary by other, sometimes highly experienced, Ps users (some unconnected with, but also some directly connected with, Adobe). I relied upon these representations when making my decision to purchase the upgrade from CS3 to CS4. In fact, they were my principal reason for upgrading. Without them, I would not have upgraded. Set out in numbered paragraphs 1 to 6 below is a small selection only of this material.
1. Watch the video "Photoshop CS4: Buy or Die" by Deke McClelland (inducted into the Photoshop Hall of Fame, according to his bio) on the new features of CS4 in a pre-release commentary to be found here:
http://fyi.oreilly.com/2008/09/new-dekepod-deke-mcclelland-on.html
Notice what he says about zooming with Open GL: "every zoom level is a bicubically rendered thing of beauty". That, when viewed with the zooming demonstrated, can only be meant to convey that your image will be "sharp" at all zoom levels. I'm sure he believes it too - Deke is someone who is noted for his outspoken criticism of Photoshop when he believes it to be deserved. It would seem that he must not have experimented and tested to the extent that others posting in this forum have done so.
2. Here's another Adobe TV video from Deke McClelland:
http://tv.adobe.com/#vi+f1584v1021
In this video Deke discusses the "super smooth" and "very smooth" zooming of CS4 at all zoom levels achieved through the use of OpenGL. From the context of his comments about zooming to odd zoom levels like 33.33% and 52.37%, it is beyond doubt that Deke's use of the word "smooth" is intended to convey "sharp". At the conclusion of his discussion on this topic he says that, as a result of CS4's "smooth and accurate" as distinct from "choppy" (quoted words are his) rendering of images at odd zoom levels (example given in this instance was 46.67%), "I can actually soft proof sharpening as it will render for my output device".
3. In an article by Philip Andrews at photoshopsupport.com entitled 'What's New In Adobe Photoshop CS4 - Photoshop 11 - An overview of all the new features in Adobe Photoshop CS4',
see: http://www.photoshopsupport.com/photoshop-cs4/what-is-new-in-photoshop-cs4.html
under the heading 'GPU powered display', this text appears :
"Smooth Accurate Pan and Zoom functions – Unlike previous versions where certain magnification values produced less than optimal previews on screen, CS4 always presents your image crisply and accurately. Yes, this is irrespective of zoom and rotation settings and available right up to pixel level (3200%)." Now, it would be a brave soul indeed who might try to argue that "crisply and accurately" means anything other than "sharply", and certainly, not even by the wildest stretch of the imagination, could it be taken to mean "slightly blurry but smooth" - to use the further words of Chris Cox also contained in his post #11 mentioned in the initial link at the beginning of this post.
4. PhotoshopCAFE has several videos on the new features of CS4. One by Chris Smith here:
http://www.photoshopcafe.com/cs4/vid/CS4Video.htm
is entitled 'GPU Viewing Options". In it, Chris says, whilst demonstrating zooming an image of a guitar: "as I zoom out or as I zoom in, notice that it looks sharp at any resolution. It used to be in Photoshop we had to be at 25, 50 , 75 (he's wrong about 75) % to get the nice sharp preview but now it shows in every magnification".
5. Here's another statement about the sharpness of CS4 at odd zoom levels like 33.33%, but inferentially at all zoom levels. It occurs in an Adobe TV video (under the heading 'GPU Accererated Features', starting at 2 min 30 secs into the video) and is made by no less than Bryan O'Neil Hughes, Product Manager on the Photoshop team, found here:
http://tv.adobe.com/#vi+f1556v1686
After demonstrating zooming in and out of a bunch of documents on a desk, commenting about the type in the documents which is readily visible, he says : "everything is nice and clean and sharp".
6. Finally, consider the Ps CS4 pdf Help file itself (both the original released with 11.0 and the revised edition dated 30 March 2009 following upon the release of the 11.0.1 update). Under the heading 'Smoother panning and zooming' on page 5, it has this to say: "Gracefully navigate to any area of an image with smoother panning and zooming. Maintain clarity as you zoom to invididual pixels, and easily edit at the highest magnification with the new Pixel Grid." The use of the word "clarity" can only mean "sharpness" in this context. Additionally, the link towards the top of page 28 of the Help file (topic of Rotate View Tool) takes you to yet another video by Deke McClelland. Remember, this is Adobe itself telling you to watch this video. 5 minutes and 40 seconds into the video he says: "Every single zoom level is fluid and smooth, meaning that Photoshop displays all pixels properly in all views which ensures more accurate still, video and 3D images as well as better painting, text and shapes.". Not much doubt that he is here talking about sharpness.
So, as you may have concluded, I'm pretty upset about this situation. I have participated in another forum (which raised the lack of sharp rendering by CS4 on several occasions) trying to work with Adobe to overcome what I initially thought may have been only a problem with my aging (but nevertheless, just-complying) system or outdated drivers. But that exercise did not result in any sharpness issue fix, nor was one incorporated in the 11.0.1 update to CS4. And in this forum, I now read that quite a few, perhaps even many, others, with systems whose specifications not only match but well and truly exceed the minimum system requirements for OpenGL compliance with CS4, also continue to experience sharpness problems. It's no surprise, of course, given the admission we now have from Chris Cox. It seems that CS4 is incapable of producing the sharp displays at all zoom levels it was alleged to achieve. Furthermore, it is now abundently clear that, with respect to the issue of sharpness, it is irrelevant whether or not your system meets the advertised minimum OpenGL specifications required for CS4, because the OpenGl features of CS4 simply cannot produce the goods. What makes this state of affairs even more galling is that, unlike CS3 and earlier releases of Photoshop, CS4 with OpenGL activated does not even always produce sharp displays at 12.5, 25, and 50% magnifications (as one example only, see posts #4 and #13 in the initial link at the beginning of this post). It is no answer to say, and it is ridiculous to suggest (as some have done in this forum), that one should turn off OpenGL if one wishes to emulate the sharp display of images formerly available.

Thanks, Andrew, for bringing this up. I have seen comments and questions in different forums from several CS4 users who have had doubts about the new OpenGL display functionality and how it affects apparent sharpness at different zoom levels. I think part of the interest/doubt has been created by the over-the-top hype that has been associated with the feature as you documented very well.
I have been curious about it myself and honestly I didn't notice it at first but then as I read people's comments I looked a little closer and there is indeed a difference at different zoom levels. After studying the situation a bit, here are some preliminary conclusions (and I look forward to comments and corrections):
The "old", non-OpenGL way of display was using nearest-neighbor interpolation.
I am using observation to come to this conclusion, using comparison of images down-sampled with nearest-neighbor and comparing them to what I see in PS with OpenGL turned off. They look similar, if not the same.
The "new", OpenGL way of display is using bilinear interpolation.
I am using observation as well as some inference: The PS OpenGL preferences have an option to "force" bilinear interpolation because some graphics cards need to be told to force the use of shaders to perform the required interpolation. This infers that the interpolation is bilinear.
Nothing is truly "accurate" at less than 100%, regardless of the interpolation used.
Thomas Knoll, Jeff Schewe, and others have been telling us that for a long time, particularly as a reason for not showing sharpening at less than 100% in ACR (We still want it though ). It is just the nature of the beast of re-sampling an image from discrete pixels to discrete pixels.
The "rule of thumb" commonly used for the "old", non-OpenGL display method to use 25%, 50%, etc. for "accurate" display was not really accurate.
Those zoom percentages just turned out to be less bad than some of the other percentages and provided a way to achieve a sort of standard for comparing things. Example: "If my output sharpening looks like "this" at 50% then it will look close to "that" in the actual print.
The "new", OpenGL interpolation is certainly different and arguably better than the old interpolation method.
This is mainly because the more sophisticated interpolation prevents drop-outs that occurred from the old nearest-neighbor approach (see my grid samples below). With nearest-neighbor, certain details that fall into "bad" areas of the interpolated image will be eliminated. With bilinear, those details will still be visible but with less sharpness than other details. Accuracy with both the nearest-neighbor and bilinear interpolations will vary with zoom percentage and where the detail falls within the image.
Since the OpenGL interpolation is different, users may need to develop new "rules of thumb" for zoom percentages they prefer when making certain judgements about an image (sharpening, for example).
Note that anything below 100% is still not "accurate", just as it was not "accurate" before.
As Andrew pointed out, the hype around the new OpenGL bilinear interpolation went a little overboard in a few cases and has probably led to some incorrect expectations from users.
The reason that some users seem to notice the sharpness differences with different zooms using OpenGL and some do not (or are not bothered by it) I believe is related to the different ways that users are accustomed to using Photoshop and the resolution/size of their monitors.
Those people who regularly work with images with fine details (pine tree needles, for example) and/or fine/extreme levels of sharpening are going to see the differences more than people who don't. To some extent, I see this similar to people who battle with moire: they are going to have this problem more frequently if they regularly shoot screen doors and people in fine-lined shirts. Resolution of the monitor used may also be a factor. The size of the monitor in itself is not a factor directly but it may influence how the user uses the zoom and that may in turn have an impact on whether they notice the difference in sharpness or not. CRT vs LCD may also play a role in noticeability.
The notion that the new OpenGL/bilinear interpolation is sharp except at integer zoom percentages is incorrect.
I mention this because I have seen at last one thread implying this and an Adobe employee participated who seemed to back it up. I do not believe this is correct. There are some integer zoom percentages that will appear less sharp than others. It doesn't have anything to do with integers - it has to do with the interaction of the interpolation, the size of the detail, and how that detail falls into the new, interpolated pixel grid.
Overall conclusion:
The bilinear interpolation used in the new OpenGL display is better than the old, non-OpenGL nearest-neighbor method but it is not perfect. I suspect actually, that there is no "perfect" way of "accurately" producing discrete pixels at less than 100%. It is just a matter of using more sophisticated interpolation techniques as computer processing power allows and adapting higher-resolution displays as that technology allows. When I think about it, that appears to be just what Adobe is doing.
Some sample comparisons:
I am attaching some sample comparisons of nearest-neighbor and bilinear interpolation. One is of a simple grid made up of 1 pixel wide lines. The other is of an image of a squirrel. You might find them interesting. In particular, check out the following:
Make sure you are viewing the Jpegs at 100%, otherwise you are applying interpolation onto interpolation.
Notice how in the grid, a 50% down-sample using nearest-neighbor produces no grid at all!
Notice how the 66.67% drops out some lines altogether in the nearest-neighbor version and these same lines appear less sharp than others in the bilinear version.
Notice how nearest-neighbor favors sharp edges. It isn't accurate but it's sharp.
On the squirrel image, note how the image is generally more consistent between zooms for the bilinear versions. There are differences in sharpness though at different zoom percentages for bilinear, though. I just didn't include enough samples to show that clearly here. You can see this yourself by comparing results of zooms a few percentages apart.
Well, I hope that was somewhat helpful. Comments and corrections are welcomed.

Screen flicker at low brightness

Hi all
I have a macbook pro unibody 15" and I seem to be getting a screen flicker at low brightness settings.
I used to have a macbook and it never did this.
Is this normal and if not, is there anything that I can do about it?
Message was edited by: Gambit Hunt

Hi G,
I was going to suggest having it checked for the NVIDIA issue, but you state you have a unibody. If you have a new unibody, you would be best served if you posted in that forum (this area is for the Original MBP). Good luck.

Brightness levels change while using Apple TV

The brightness levels change on my TV screen every few minutes while I'm watching my Apple TV. It happens with "Internet" sources (like Netflix and Vimeo) and "Computer" sources like iPhoto for sure. Maybe the other sources as well. Any clues?

Welcome to the Apple Community.
Check that the HDMI cable is correctly seated at both ends.
Try disconnecting the cable and connecting it again.
Try another HDMI cable.
Try the Apple TV with another TV

Brightness levels reset to default on restart

I'm using iBooks & find it frustrating that if I change the brightness level, the new level is not remembered & find it reverts to the default level each time I re-open I-books. Perhaps this issue could be rectified at a future version revision?

Try completely closing out of iBooks: from the Home screen double tap the Home button, once the multitask bar appears hold down on the iBooks icon until it starts to jiggle, press the red icon in the corner to close out of iBooks. Now restart the iPad and see if this might help resolve the brightness issue.
Alternatively instead of a restart you could perform a Reset once you close iBooks. Reset: hold down the Home and Sleep/Wake button at the same time for ~10sec, ignore the Slide to Power Off, the iPad will then Reset, Note: No data is lost during a Reset.
if the problem continues you might need to delete iBooks and then redownload it from the App Store. if none of the suggestions provided dont help resolve the issue then I suggest leaving feedback here: http://www.apple.com/feedback/

Strobing Screen on MBA (all brightness levels)

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