It's not perfect, but I had am improved experience with the lapdock hdmi
from Angstrom BBB-eMMC-flasher-2013.09.04.img.xz by setting these modelines
in /etc/X11/xorg.conf in the Monitor section.
Modeline "1360x768@60" 84.50 1360 1392 1712 1744 768 783 791 807 +
hsync +vsync
Modeline "1280x720@50" 74.25 1280 1720 1760 1980 720 725 730 750 +
hsync +vsync
Then, pick the resolution using the GUI tool System -> Preferences ->
Monitors tool.
dmesg on this 2013.09.04 version with Atrix lapdock shows that the EDID
native resolution is rejected as invalid:
> [ 39.402958] [drm:drm_mode_debug_printmodeline], Modeline 14:"1366x768" 60
> 72000 1366 1380 1436 1500 768 769 772 800 0x48 0x5
> [ 39.402975] [drm:drm_mode_prune_invalid], Not using 1366x768 mode 11
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