according to that very thread there is some editing you can do to a file to resolve this... See the posts by JameZ on page 7 of the thread.
On Fri, Jul 29, 2011 at 12:55 PM, Scott Matthews <[email protected]>wrote: > hmm, from what I can find, the only way to prevent the screen from > switching between 50 and 60hz is to make it use 50hz? There seems to > be no way to get 60hz on battery? > > > http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T420S-Display-Switching-To-50Hz-On-Battery-Power/td-p/422875 > > > > On Fri, Jul 29, 2011 at 12:16 PM, Scott Matthews <[email protected]> > wrote: > > Thanks! It does indeed appear to be switching between 50 and 60hz -- > > but when I unplug it and set it to 60, and then plug/unplug again, it > > winds up back at 50 -- where do I go to set that, such that it > > "sticks"? > > > > > > > > On Fri, Jul 29, 2011 at 12:06 PM, Jonathan Kelly <[email protected]> > wrote: > >> Check that the refresh rates are the same for both on & off mains power. > If > >> it is dropping from 60 to 50hz, that would cause the blank screen effect > as > >> it makes the step up/down. > >> > >> On Friday, July 29, 2011, Scott Matthews <[email protected]> wrote: > >>> Hi all, I have a new Win7 64bit Thinkpad. When I unplug or plug in the > >>> power it: beeps, then adjusts brightness, then goes totally black, > >>> then returns -- is that normal? Is there some way to eliminate that > >>> black bit? > >>> _______________________________________________ > >>> Thinkpad mailing list > >>> [email protected] > >>> http://stderr.org/cgi-bin/mailman/listinfo/thinkpad > >>> > > > _______________________________________________ Thinkpad mailing list [email protected] http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
