Screen Flashes when opening lid after locked - T410s w/discrete -- Video of problem inside

My computer is set to password lock (in Windows 7) when I close the lid, but remain powered on.  When I open the lid of the computer, the screen flashes around 10 times before it gives me the login screen. 
My bios is updated, my graphics are turned to 'high performance' ... always on - when plugged in with A/C adapter.
Anyone know what the problem might be?
http://tinypic.com/player.php?v=fky0qd&s=7
System specs:
 i5-520M(2.4GHz), 8GB RAM (2x 10666 - 1333mhz sticks, downclocked), 250GB 5400rpm HD, 14.1in 1440x900 LCD, 512MB nVIDIA Quadro NVS 3100m, CDRW/DVDRW, Intel 802.11agn wireless, WWAN option, Bluetooth, 1Gb Ethernet, UltraNav, Secure Chip, FPR, Camera, 6c Li-Ion, Win7 Pro 64

@paradiddle,
If it is possible, could you try removing the password so when the system wakes up from sleep, see if the screen flashes.
Also when your display is "out" to the TV via HDMI, try pressing Fn + F7 and see if you are able to switch it back to laptop view without rebooting. You could also change this via Display Properties.
//JameZ
Check out the Community Knowledge Base for hints and tips.
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X240 | 8GB RAM | 512GB Samsung SSD

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