Po-Hsu Lin, as per http://www.dell.com/support/home/us/en/19/product-
support/product/inspiron-15-7548-laptop/drivers/advanced an update to
your computer's buggy and outdated BIOS is available (A05). If you
update to this following https://help.ubuntu.com/community/BIOSUpdate
does it change anything?

Once the BIOS is updated, if the problem is still reproducible:
1) Please provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
2) Please make a comment specifically advising on if there was an improvement 
or not.
3) Please mark this report Status Confirmed. If it's not reproducible, please 
mark this as Invalid.

Thank you for your understanding.

** Tags added: bios-outdated-a05

** Package changed: linux-lts-utopic (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1481266

Title:
  Two finger zoom / pinch and 4-finger gesture does no work on
  MSFT0001:00 06CB:75BD touchpad

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