Comment 151 for bug 999910

I experienced the freezes and problems during boot as well as docking/undocking with several Lenovo X230 (new devices) in our computing lab. I checked all the hardware so far (board, CPU, RAM) with the appropriate diagnostic tools so far (Lenovo Diagnostics, Intel CPU Diagnostics and Memtest86+). so I can confirm the hardware works fine.

Further I migrated two systems from Ubuntu 12.04.0 LTS (with upgrades applied) to Xubuntu 12.04.2 LTS (with upgrades applied) and realized a major improvement. Sometimes a system freezes (completely, no NUM lock works, no Video repost, completely frozen) At present I see three things to test:

- Try the Ubuntu LTSEnablementStack (https://wiki.ubuntu.com/Kernel/LTSEnablementStack) which upgrades Kernels from 3.2.0.x to 3.5.x.

- Try the prorietary NVidia graphics driver for GNU/Linux 64 bit which is however not in the repositories and this must be managed manualy from that time on.

- Try to completely disable: compositing in Xfce, power savings in Xfce and with Kernel parameter and adjust EFI settings if applicable.

I think it is a combination of Kernel, X11 and GPU driver (nouveau) which makes the system freeze. Since Ubuntu has Unity this GUI pulls several packages as a dependency which I can not overlook. It seems like Xfce is better with regards to this issue.