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.

I have a dell inspiron 5520 which has a amd radeon 7670m graphic card.

Earlier on 13.10 I used to turn off my graphic card (it generates a lot of heat otherwise) using

$ echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

Now after upgrading to 14.04, whenever my laptop is idle for sometime and goes to lock screen, it hangs. Same is case with suspend.

But if I lock it manually, then it doesn't hang.

The above problem happens only when graphic card is turned off.

Any suggestions, how to rectify this?

One possible solution that I think is to enable graphic card just before system locks or suspends. How to do this?

share|improve this question
I have done the same thing on ubuntu 12.04 and I am facing the same problem.Unable to find a solution yet. –  user3534877 Apr 24 at 2:51
add comment

1 Answer 1

I had to solve my problem on my own. I tried various drivers from amd and finally the fglrx proprietary drivers seems to be working.

  1. Remove any other previous installation of fglrx (if any)

$ sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev*

  1. Go to "Softwares and Updates" through dash and install the proprietary drivers (second one on list in Additional Drivers tab).

  2. Reboot the system.

  3. Open Catalyst control panel by $ sudo amdcccle

  4. Switch to Intel Graphics if you don't want to use your graphics card.

PS - This is the first time proprietary drivers are working fine for me.

share|improve this answer
add comment

Your Answer


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.