yes http://forum.lemaker.org/thread-15430-1-1.htmlthis was my first try using search in internet.
i can get changes on the TFT but w/o good results, i mean i can get a smaller desktop in upper left corner and black on remaining parts or changing again a freezing monitor, today i was following another way finding this http://linux-sunxi.org/Fex_Guide#disp_init_configurationand using fex2bin and bin2fex, The converter works! the results are same as using fbset . I agree there is something on behind that cannot permit resolution change in flexible way out of predefined table (on TV LED all the HDMI preset are ok). Back on Raspberry with working res via config.txt the fbset give me this out:
geometry 1024 576 1024 576 16
timings 0 0 0 0 0 0 0
(in rc.local nothing written)
obviously putting this numbers on fb.modes an running fbset on O PI PC nothing is working as expected.
i hope can help