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Hi,I have an ASUS K42DY laptop with AMD Phenom II x2, 8 GB Ram , 500 GB Hard Drive and has a didicated ATI RADEON HD 6470M Graphics Card and I'm running Ubuntu 12.04 LTS 64bit on it. I have installed GNOME 3 and also followed this Make Ubuntu look like Mac OS X. I have also installed apps from the software center, getdeb & playdeb all of which worked fine. However, I noticed that Ubuntu freezes after inactivity let's say 1-3hrs. I have already set power setting to never standby or hibernate. This is completely annoying because all I can do is log-out via ctrl+alt+del or manually shut down and reboot my laptop. What should I do? By the way, this happens on all shells Unity, Gnome (even with the basic) and Cairo Dock.I set Swap Space at 8GB during installation.

Any help will be appreciated. Thanks!

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The problem could be that U didn't install the additional driver for your graphic card from ubuntu settings manager.Here is what U could do if you don't find any additional driver.

Step 1 : (uninstall the current driver using the terminal)

sudo sh /usr/share/ati/

sudo apt-get remove --purge fglrx fglrx_* fglrx-amdcccle* fglrx-dev* xorg-driver-fglrx 

Step 2 : (install the ati catalyst using the terminal)

sudo apt-get install unzip

cd /tmp && wget -O

chmod +x

sudo sh     

Step 3 : (Configure)

sudo aticonfig --initial -f 

Step 4 : reboot

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I'm sorry I forgot to mention that I have installed the "Restricted Drivers" for my graphics card, I have ATI Catalyst. If this is the one that you are referring to.. thanks! – ix3 Nov 4 '12 at 3:41

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