Nokia has disabled the vdd2 first, in PR1.2 I suppose. vdd1 was disabled later. Notice, SR crashes the N900 above 805Mhz Even QCpuFreq enables only vdd1. When I use the omap kernel, I use also only vdd1. You can use the queen beecon widget or some menu shortcuts. read the 720p playback thread: the profile was designed specially for 720p. I'd go to ideal or low voltages profiles instead.