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Computer monitor doesn't display when connected to my laptop!

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I have Aspire Acer 5750 laptop with Intel HD 3000 graphics and Mac OS X 10.7.4 installed on it. My problem is that I can't adjust brightness, the brightness is too high that my eyes start hurting after 5 mintues of use. I could not find a DSDT patch or a kexts file to fix this issue. Since I have an extra computer monitor, I would like to connect it to my laptop and from there maybe I can adjust the brightness. For some reason when I do that, my monitor displays nothing, just black screen.


The only time I could see something is durning the installation process and the booting up process. Right now if I plugin my monitor to my laptop, nothing appears, but if I plug it in to my laptop when it is booting up, I can only see up to the user login screen section. As soon as the user screen shows up, my monitor goes black.


I hope someone can help here. It's really frustrating to use the laptop when the brightness is set to the highest level, too much for my eyes.


Thank you!

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It looks like it worked, but there is a slight problem with the brightness level. You see when I move the slider to the left, the brightness decreases to about 50% only when it should go down slowly to 0%.


The brightness level is about 50% before the very last step level, if I move it one more step to the left, the screen goes black.




I attached my DSDT file just in case you need it. Thanks!




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I found a temporarily fix to the brightness issue. I don't call it a solution, but its just a trick to get the brightness under control for now. I am not an expert with DSDT editing or else I would have tried adding some codes as suggested in the website you provided, I just chose this easy way.


I just deleted my DSDT file from my Extra folder, then I rebooted the laptop. While it was rebooting I decreased the brightness to the level desired with FN + Left/Right arrows. Since I deleted the DSDT file, the brightness level remained the same, before with the DSDT file, it would change itself.


Anyway, I am not happy about this solution, but since I tried to fix it for more than half a month and I failed, I would rather move on. If you ever find a solution even after a year, know that I am waiting for a real fix.


Thanks a lot to both of you!

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