I have just set up a desktop box with Ubuntu 16.04. It is working fine, except it locks up when the display shuts off per system settings under brightness & lock. I researched this a little and found this thread that suggests editing /etc/default/grub to set
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend=-1"
and this thread that says the parameter you have to change on recent Ubuntu releases is "autosuspend_delay_ms". I have tried both using the procedure in the first link, and the autosuspend value remains 2 even after changing the grub conf file and restarting it. I can't find out what the 2 value that is set is supposed to indicate.
The second link suggests some other things to try but it's not clear that these apply to Ubuntu. I don't want to mess around until I know I'm doing the right thing because I don't want to hose my nice clean install.
Other things I've read says this applies to laptops that shut down USB to save power, but this is a desktop so maybe usbcore.autosuspend is not even what is causing the lock up.
Can anyone recommend a way to proceed?
sudo update-grubafter adding the parameter to the grub configuration files? – Charles Green May 01 '17 at 21:06