Po-Hsu Lin, thank you for the consolidated focus of this report. One thing that 
is of interest is , as per 
http://www.dell.com/support/drivers/us/en/19/Product/inspiron-14r-se-7420 an 
update is available for your BIOS (A19). If you update to this following 
https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it 
doesn't, could you please both specify what happened, and just provide the 
output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

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https://bugs.launchpad.net/bugs/1194761

Title:
  Camera -  Microdia [0c45:648d] rev 1c.07, unable to take still
  pictures with camera_test (fswebcam)

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