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[Uri Yanover <uri.yanover+ubuntu@xxxxxxxxx>]

This effect does not occur when the system is booted without KMS (Kernel
Mode Setting), i.e., kernel param nomodeset.

It observe the immediate precursor for strange behaviour as Plymouth's
entry into framebuffer mode for its splash screen. The stripes appear in
Plymouth's graphics as well. Also, when entering the text consoles
(Ctrl+Alt+F1) after Plymouth's start, the framebuffer text appears only
on a quarter of the screen, as opposed to "classic" BIOS text which
appears on the whole screen.

My theory regarding the underlying cause is: Plymouth incorrectly
configures the TV output, and the state  is carried, without change,
into X's configuration

Also, a similar set of phenomena might have occured to me when testing
an older R128 card - the boot sequence started normally (including TV
mirrorring), but after Plymouth started, the TV out was spoiled.

-- 
TV output has stationary horizontal gray stripes
https://bugs.launchpad.net/bugs/584169
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