Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

Every time I suspend my notebook (Lenovo Thinkpad T420 - Intel HD graphic card) on Oneiric Ocelot 11.10 and turn it back on, the screen is black. The backlight is on and the system itself loads fine, but the display somehow doesn't get back. The first time after a fresh reboot the screen isn't black, it is mostly white/light-gray and it looks a bit like a distorted image. The pixels fade in until it gets almost completely light-gray.

I've got a workaround for this: I switch to the first terminal (CTRL+ALT+F1) and back to X (CTRL+ALT+F7). In most cases that helps. Sometimes, when there's still a problem, I log in on the first terminal and run "unity --reset". Then go back to X - this helps always.

I can tell that the system comes back, because I can log in with my fingerprint reader (or wait a bit and put in the password) "blindly", then do the workaround - I am logged in after the screen comes back. So it's only the display that is not working.

Any help or advice where to look would be appreciated.

share|improve this question
2  
you should give your solution as an answer and accept it –  Dirk Hartzer Waldeck Dec 15 '11 at 21:06
    
btw it worked for me too! –  Dirk Hartzer Waldeck Dec 15 '11 at 21:06
add comment

1 Answer 1

up vote 1 down vote accepted

As Dirk suggested, I'm adding the solution as an answer:

I might have found a fix for this by accident. I was reading about extending my battery life and it turned out the package "laptop-mode-tools" wasn't installed. The package doesn't work out-of-the-box on my notebook, but I found this: Unhandled kernel version error when trying to install laptop-mode-tools Since I installed this package, the problem seems to be gone.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.