https://bugs.freedesktop.org/show_bug.cgi?id=24973

--- Comment #12 from Alex Deucher agd5f@yahoo.com 2010-08-02 07:25:08 PDT --- (In reply to comment #11)

I verified this issue is still present with 2.6.35rc6 and the current X packages on xorg-edgers. Something new I noticed with Ubuntu 10.04: if I set GRUB_GFXMODE=1400x1050 (the native resolution of the LVDS) in /etc/defaults/grub, then the console actually uses the correct resolution. Howerver, once X starts, the new FB switches to 800x600. The Xorg.0.log indicates that S-Video is falsely detected as being connected, while in fact nothing is attached.

What can I do to further isolate the cause of this issue?

Unfortunately, load detection for tv-out is inherently unreliable on a lot of boards (You can end up with false positives and false negatives). The best option is to force the tv-out connection on or off in your console or xorg config.