I checked some E5470 IOreg from other user and the Webcam is detected under XHC/HS11
Check your BIOS, make sure it's enabled.
For the external HDMI display, for this model when you plug in HDMI or DP display, the internal LCD goes blank. Just close the LCD for a few second until the external becomes the primary display.
Then open the LCD, both display will come on. You just need to place system to sleep once before attaching external display, then you won't have this issue. You could try EDID to fix it.