W520 Dim panel suddenly going bright issue

When I boot my machine, the internal panel is so dim I cant work with it. Its the equiv. of about 11 on the lenovo brightness scale of 1-15.
the brightness control FN-pg-up has no effect - its already at its brightest (it thinks). Fn-page down makes it dimmer still.
Then I launch any program which asks for administrator permission, such as my openVPN client. The screen gets blacked out while it asks for permission, then when it comes back to normal, a few seconds later bam- the screen is at its full brightness again.
I dont always get this, but I cant see a pattern. It seems to be more frequently when I have an external monitor connected.
In the power manager, I have a custom profile with everything at its max (i.e max performance and max brightness).
I thought it was due to my Color Monki drivers, but I uninstlalled them, and the problem is still there.
Anyone else get this, or is It just me again?

Might be the Intel graphics card drivers. They do have a set range of brightness values that vary between versions.
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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W520 Dim panel suddenly going bright issue

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