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I did a fresh install of Ubuntu 12.04 (dual boot with Windows 7) on my sony Vaio. After the fresh install everything was working fine. then

  1. I was informed that new driver were available for my ATI video card (I first tried to install the post-release one but it was not possible so I selected the one tested by canonical)
  2. After that I noticed a bug where my laptop was rebooting instead of resuming from hibernate (i.e if I was closing the lid .. the laptop was hibernating but if I was opening the lid the laptop was shutting down)
  3. It was a bug I already experienced in 11.10 and I fixed it by amending the grub file from GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_sleep=nonvs" ... the fix sorted out that issue but introduced a new issue .. now when I shutdown my laptop it hangs on the splash screen (Ubuntu logo with the 4 dots) and nothing happens.
  4. I tried to use the following fix GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force splash acpi_sleep=nonvs" but it is not working.

Any help in fixing this would be appreciated.

PS: after 5 years using Ubuntu this is the first time I am not able to find the solution within a week

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The fglrx driver will cause our computer to hang while shutting down. I had reported the bug here. – Emerson Hsieh May 28 '12 at 20:33

Solved by doing the following:

I've rolled back the grub file as it was originally (only quiet splash option), then:

sudo apt-get install fglrx-updates
sudo aticonfig --initial

Looks like that installing ati driver from the ubuntu driver update GUI is not a smooth process.

share|improve this answer
You can accept your own answer later. – Andrejs Cainikovs May 22 '12 at 20:08
This didn't work for me on Thinkpad t500. Same problem here, after installing fglrx-updates shutdown hangs forever – Janning May 28 '12 at 21:04
This is the correct answer! I just posted it again with a picture of my bios setting. – Janning May 28 '12 at 21:44

Mybe wrong to post it as an answer but i wanted to add an image:

with my Thinkpad T 500 shutdown hangs after aptitude install fglrx-updates fglrx-amdcccle-updates.

I needed to change BIOS settings like this:

enter image description here

and then i ran

sudo update-grub
sudo apt-get install fglrx-updates
sudo aticonfig --initial
sudo update-grub

It worked for me.

share|improve this answer
Did your Ubuntu splash screen shows up ugly? (I mean low- res) – Emerson Hsieh May 28 '12 at 21:59
First yes, but i think this is another problem, which i fixed by "cp /usr/share/grub/*.pf2 /boot/grub && update-grub" see – Janning May 29 '12 at 7:51
Thanks for the bug link! And I thought I was the only person in the ubuntu community that got the low -res boot screen after install the drivers. – Emerson Hsieh May 31 '12 at 2:00

sudo update-grub fixed my 12.04 shutdown problem.

share|improve this answer

You could try this, it may help:

GRUB_CMDLINE_LINUX_DEFAULT="acpi=off apm power_off=1 quiet splash"

Then run sudo update-grub and restart.

This fixed the problem on my notebook.

share|improve this answer
Thank you for your answer ... do you know where I can find the meaning of all the options we can pass to GRUB_CMDLINE_LINUX_DEFAULT ? Apart from quiet splash I have no idea of what the other options mean ... Thank you – kaizer May 22 '12 at 8:49
@kaizer You might want to post a new question asking if there is an online source that lists and explains all possible Linux kernel boot options. I'm not sure if there's a good current source for this, but if so, it would be quite valuable. – Eliah Kagan May 28 '12 at 20:28

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