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bbfa235
(Get the code!)
I have now a fresh xenial system on my Dell XPS 13 DE 9333.
The touchpad has been working flawlessly until I upgraded from kernel 4.4.0-62-generic to 4.4.0-63-generic.
With the new kernel the touchpad is not detected at startup. With the last working kernel the output"xinput list" command was including the touchpad, albeit with a name ( DLL060A:00 06CB:2734 ) different than the self explaining name of "SynPS/2 Synaptics TouchPad" which was standard with Ubuntu trusty ( 3.13.0-108-generic ).
With kernel 4.4.0-63-generic the touchpad is not detected at all.
My conclusion is that my original assumption that the flaw in the touchpad detection was somehow related to the upgrade from trusty to xenial IS INDEED WRONG. The bug is apparently also affecting the clean xenial installation.
The attached files contain the output of "xinput list" command, depending on the active kernel.
The touchpad is working great with 3.13 ( trusty ) and xenial ( kernel 4.4.0-62 and older )
andis not detected with kernel 4.4.0-63 )
This is valid on my Dell XPS13 DE 9333. I will try to install xenial on a Dell XPS 13 DE 9350.
On this newer computer the touchpad works well with Ubuntu trusty ( also with xenial kernels ).
I have not tried to update the BIOS, since the computer is now working quite well, albeit not with the latest kernel and my past experience with BIOS updates makes me very cautious ...