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
- 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)
- 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)
- 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 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.
- 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