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Hi,
i have XBian_1.0_Beta_1.1, everything works fine, exept if i set display_rotate=3 in config.txt, i can only see xbian loading window, after that it goes black. if i set hdmi_safe=1 then xmbc loads with rotation, but resolution is 640x480, and i cant change it.
Basicaly i need rotation to be 270 degrees, and resolution 1080x1920
i tried adding hdmi_ctv 1080 1920 60, but i'm not sure xbian support it, and it didn't helped me. I read somewhere that rotating 90 or 270 degrees requires more gpu, so added gpu_mem_512=256, still no luck.

Check dmesg:
Do you get bcm2708_fb_check_var: ERROR: VerticalTotal >= 1200; special treatment required! (TODO)

Probably cannot display at that resolution. Try reducing the resolution to something lower.

hdmi_mode=36 worked for my PC screen.

you have a problem with CEC so the wrong resolution is detected. You have to force the resolution (specific resolution for your screen) in your config.txt

add this two lines with values specific for your screen

check this two links and look for Display and HDMI sections
RPi Troubleshooting
RPi config

hdmi_mode=82 - allmost good, but since i rotate screen 270 degrees, i need 1080x1920 instead of 1920x1080
hdmi_mode=36 - not full screen, also resolution to low.
in the RPi config page, there is a link to thread http://www.raspberrypi.org/phpBB3/viewtopic.php?f=29&t=24679 that with
hdmi_cvt <width> <height> <framerate> <aspect> <margins> <interlace> <rb>

you can set custom resolution, which is what i want. however, on xbian it doesn't seem to have any efect.

http://pastebin.com/AtVWwdrR - dmesg doesn't show any bcm2708 errors.

As it's unlikely anyone has exactly the same H/W, you'll just have to trial and error.

All the available options are here: http://elinux.org/RPi_config.txt

I don't think you will get what you want - I want to go to Saturn :-) - as there is a hardware limitation. (Pixel clock limit)