HP Pavilion X2 worked almost fine on Ubuntu 13.10. Touchpad (stop working after sometime), Touch Screen. WebCam, WiFI worked fine.
On upgrading to Ubuntu 14.04, everything above mentioned stopped working.
How did you upgrade to 14.04 ? Did you encounter any error messages during the upgrade?
Even external USB mouse fail to work. Never expected such a situation.
Could you post the output of the following commands to http://paste.ubuntu.com/ :
lsusb sudo lshw
Similar thing I heard from other with different hardware.
Is there issue of drivers with Ubuntu 14.04 or Is there something I
missed?
I haven't heard of such a thing. Infact, more driver support was added in 14.04.
This was a common problem with previous versions of Ubuntu while upgrading from old version to new. So I always used to go with a fresh installation.
Best Regards, Rigved -- http://mm.ilug-bom.org.in/mailman/listinfo/linuxers