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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?

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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
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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.

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