If you're on a 64-bit system, you'll have to create an isolated environment for installing and building with 32-bit dependencies.See Building Biarch Wine On Ubuntu for detailed instructions for Ubuntu using LXC, and Building Wine for general information.
All Ubuntu 12.04 LTS users are encouraged to upgrade to Ubuntu 14.04 LTS or Ubuntu 16.04 LTS.
But for those who cannot upgrade immediately, Ubuntu 12.04 ESM updates will help ensure the on-going security and integrity of Ubuntu 12.04 systems.
This should greatly help power consumption, especially when idle.
To do so, edit /etc/default/grub and add the 'radeon.dpm=1' to the GRUB_CMDLINE_LINUX_DEFAULT line, so it would look something like: Binary Driver Howto/AMD - The Wiki page for the proprietary AMD/ATI driver "fglrx" which also offers 3D acceleration, and works on newer cards than the "radeon" driver.
Both kernels are included as part of Ubuntu 12.04 ESM.