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My system used to display the Full HD resolution - the native, very well on the Karmic.

I upgraded my system to Maverick and the maximum 16:9 resolution X server supports is 1280x720.

As far as I can remember, I didn't have to do any changes for the display back when I originally installed 10.04.

From the lspci, the graphics card I have is the one follows:

02:00.0 VGA compatible controller: ATI Technologies Inc Manhattan [Mobility Radeon HD 5000 Series]

How can I get back the high native resolution?

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Have you checked System > Administration > Additional Drivers? – Marco Ceppi Oct 11 '10 at 4:25
Marco, Thanks, but the additional driver is installed, activated and currently in use. :( – Lakshman Prasad Oct 11 '10 at 4:33
How did you determine that's the maximum supported resolution? Just that it's the highest thing listed in the graphical display tool? Or did… fail for you? – maco Oct 11 '10 at 18:10

Ok, not sure if I should delete the question. But I am sure some people may face same issue, so I will just answer it anyway.

Disable the additional driver, enable it and then restart, boom, everything back to normal!

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Don't delete it. It helped me :) – jb. Nov 11 '10 at 12:52
Had a similiar issue and came to the same conclusion. Thanks for posting it here so that I can see it confirmed here as well! – Aron Rotteveel Jan 6 '11 at 11:01

Maye to extend Lakshman's post (could someone merge it into his response please): To have resolution properly detected I needed:

  • delete xorg.conf (it gets recreated then)
  • reboot
  • System -> Administration -> Additional drivers; and enable there FGLRX Driver
  • reboot
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Thanks, this worked for me too! – ztangent Jan 25 '11 at 7:28

Also try xserver-xorg-video-ati driver instead of fglrx. Fglrx caused problems with display resolution for me when I connected external monitor.

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I have a similar problem only after the upgrade my Dell Studio laptop displays nothing but a purple screen. I can type my password in blind and hear it log in but nothing changes about the purple screen!

It's also an ATI gfx card.

Any ideas?!

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This is not an answer in technical sense. It is not possible to answer you under this question title. The problem is not the same. I advice to start a new question if there's no same question. – marenostrum Oct 21 '10 at 16:43

I have another computer, but graphic card vendor same (ATI). Try to install original driver by default( or try from menu System->Preferences->Monitor change monitor resolution.

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