I recently tried to run ubuntu 14.04 on a USB drive as I wanted to decide whether it is worth upgrading to(my netbook now has 12.04 on it).
However, when I tried to start ubuntu up from the USB drive, it did not start up as the screen was stuck on "Disabling IRQ #9". Thereafter, through trial and error, I found out that it could start up after I enabled the "acpi=off" function. But, even though it starts up into the unity interface, it is stuck at a resolution of 800x600(my netbook monitor's native resolution is 1024x600) and it is very laggy. There was no such problem when I used 12.04 on a USB drive.
Therefore, I have three questions:
1) Why does my netbook always gets stuck at "Disabiling IRQ #9" ?
2) What is acpi=off?
3) How can I resolve the problem of the low resolution and very laggy GUI on acpi=off function?
Here is my netbook's system infomation: NEC Versa N1100 Netbook, Intel Atom N270 with 945GSE Express Chipset, 1GB RAM, 160GB HDD, Ubuntu 12.04 dual boot with Windows XP
I would greatly appreciate your help regarding this issue, and thanks in advance :)
P.S. If you need more infomation to be able to help me solve this problem, please ask and also tell me how to get the info from my computer. Thanks!