An additional problem is, when the computer wakes up after
hibernate/standby, the screen will stay black.

I found three workarounds, that promise to solve this problem:

1) http://ubuntuforums.org/showthread.php?p=11423423#post11423423

2) http://ubuntuforums.org/showpost.php?p=11578848&postcount=4

3) http://linux-on-acer-aspire-5732z.blogspot.com/2011/06/backlight-
workaround-for-linux-mint-11.html


(P.S: Same issue also discussed in this thread: 
https://bugs.launchpad.net/unity/+bug/744187 )

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https://bugs.launchpad.net/bugs/910536

Title:
  Screen too dark, no backlight, unusable X

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