UN*X Note 2013-01

just some geek's notes. Placed here in case, I forgot or someone else didn't know...

"Legacy USB Support"

So what does it actually do? And what might these ominous "USB Legacy Devices" be?

Many answers are to be found about this one on the net. Reading one of them usually answered half the problem to me and reading two left me just as smart as before. Especially when said option is part of a bigger problem, usually with USB input devices that have mysteriously disappeared after rebooting or just won't be found by a freshly installed computer.

What "USB Legacy Support" really does is -despite the name- this: When enabled, the BIOS will report USB mice and/or keyboards to the operating system -or more important: to the OS' bootloader- as ("legacy") PS/2 devices, so you do not end up without mouse or keyboard if your OS does not have drivers for USB input devices installed yet. This requires, of course, that there are drivers for PS/2 mice and keyboards. So, if you just built a Linux kernel for a recent box and have not built "psmouse" or any other (legacy) PS/2 related modules you might end up with no mouse and keyboard support by GRUB and/or the initramfs or the kernel itself. While the latter can mostly be resolved by loading evdev.ko or usbhid.ko via modprobe, the first two possibilities might easily result in an unbootable system if there is an encrypted root file system or anything else requiring user input to proceed.

To set this straight:

BOINC on Debian AMD64


apt-get install xorg-dev libnotify-dev libwxgtk2.8-dev libwxgtk2.8-dev wx-common libwxbase2.8-dev


apt-get install nvidia-cuda-dev nvidia-cuda-toolkit

screensaver (did not work for me)

apt-get install libx11-xcb-dev