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Sorry, to not be more specific: my graphics problem occurred only at boot time, when switching to graphics display it frequently hanged at either a blue screen or when I edited the DSDT at the (verbose) boot screen. With the above mentioned DSDT.aml, I seem to have no such hangs. The resolution I have is 1368x768. Sorry, to not be of more help, but my knowledge is very limited.
I've run into probably the same problem. Lots of "hangs" when going to graphical display with only a hard reset to get out of. I'm running 10.7.4 and no DSDT edit seemed to help (BIOS version 1.39). I'm trying now the DSDT found at http://www.osx86.net/view/1880-thinkpad_t420.html Maybe it'll work.