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I have recently installed Ubuntu 13.04 x64 on a 2013 UEFI laptop which was running Win8. Now I only have Ubuntu 13.04.

The distribution is working well in most case. However, a few seconds after I logout, I see a blank screen. After a few seconds, I can hear the dum-dum sound. If I press on my Num Lk key or CapsLk, the light indicator still works.

I cannot suspend either.

I suspect it is a display error, since my laptop has only the 1600x900 res.

Thank you.

Here are some of my specs: Processor 2x Intel(R) Pentium(R) CPU 2020M @ 2.40GHz

Memory 3914MB (1554MB used)

Operating System Ubuntu 13.04

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Can you please add your graphics card model to the question? Also, open a terminal and provide the output of lspci, read I have a hardware detection problem, what logs do I need to look into? for more useful information you might provide. – edwin Aug 7 '13 at 0:35

Since you don't have Grub

Go for a system test first. Go to Applications -> System Tools -> Administration -> System Testing and put your password when asked. Reply with result here or you may be solve the problem by yourself! :)

If you have enabled preload, disable it and run from the terminal:

  1. sudo apt-get update && sudo apt-get upgrade
  2. sudo apt-get autoremove
  3. sudo apt-get autoclean
  4. sudo apt-get clean
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