Didn't work. I was able to reproduce the problem with the live "cd" from quantal, 64bits.
I downloaded the ISO just now, created a bootable pendrive, booted from it and in the desktop, once loaded, hit the key to dimm the backlight. Instant hard lock.
So, the problem happens in quantal, 64bits, with lenovo's 83ET72WW (1.42 ) BIOS for my T420.
Didn't work. I was able to reproduce the problem with the live "cd" from quantal, 64bits.
I downloaded the ISO just now, created a bootable pendrive, booted from it and in the desktop, once loaded, hit the key to dimm the backlight. Instant hard lock.
So, the problem happens in quantal, 64bits, with lenovo's 83ET72WW (1.42 ) BIOS for my T420.