Please, follow this link, and check the tv-out connection with your device.
I checked 3 different tvs with 3 different n900s, with the same result.
The output is compressed vertically, and does not fill the whole screen. Do you have this issue?

Given that the 900 is pushing out an 800 x 480 image over a 640 x 480 connection, I'd say that it is normal...especially since you're connecting it to a 16x9 monitor that's set to "auto stretch/auto fill"

It was ok with the previous fw. And its ok with the samsung gt-i8000.
I dont have any monitor, it is a lcd tv.
How does yours look like? is it compressed vertically too? (rectangles look like ellipses)

Maybe the N900 vide out settings are set to 4:3? At least that's a possibility on the N95...

There is no any setting for TV out in N900. Only Video format PAL/NTSC is selectable. On GT-i8000 there are lots of setting for TV output, that contains 4:3/16:9 selectable mode too. I will chect at home how does the i8000 look like in 4:3 mode on 16:9 tv.

Ive already reported this bug.

Oh well, I tried

That's the thing, it "wasn't ok" previously...i.e. the aspect ratio was incorrect before, even if the screen was "filled". Current state is in proper format. Again, you're sending a 4:3 ratio signal to a 16:9 "LCD TV", its going to be "strectched" unless you change the "LCD TV's" properties, if possible.

My car's in-dash NAV has 'TV-In' connection, with "Normal" and "Wide" modes. The resolution is 800x480, but the two different modes makes the image look different, even though its a 1:1 pixel match with the 900's resolution.

It would be a different story if you were connecting to your "LCD TV" with component or HDMI connections, as they can handle the "above SD" resolutions.

FWIW, monitor = display given that its recreating the 900's image via composite cable.

Here is what it "should" look like on a 16:9 TV:






...and an SDTV for comparison:

If you install xvattr on the N900 you can play with some TV-out settings (scaling, 16:9 vs. 4:3).

[offtopic]
Those huuuuge images will probably stall microb quite effectly.