I have had ubuntu running fine from usb external hd. When i bought a new laptop (toshiba L775D-S7222) and tried to boot I found that not always but sometimes there was a problem that shutdown did not poweroff rather restarted. Also when this happens my laptop keyboard and mouse dont work at all and I need to use external. When this happens I sometimes fing in the bios that internal mouse is disabled even though I know clearly that I left it enabled.
How can I go about debugging this?
some lines from dmesg:
[ 2.770728] ehci_hcd 0000:00:16.2: QUIRK: Enable exception for AMD Hudson ASPM [ 2.770741] ehci_hcd 0000:00:16.2: applying AMD SB700/SB800/Hudson-2/3 EHCI dummy qh workaround [ 3.011495] powernow-k8: Found 1 AMD A6-3400M APU with Radeon(tm) HD Graphics (4 cpu cores) (version 2.20.00)