I'm running 64-bit Lucid on a Thinkpad X200s. When at "home base" this in a dual head configuration: X200 UltraBase/DisplayPort-to-DVI-D adapter/Dell 20-inch 1600x1200 panel. I tried the enable_fbc and lvds_downclock options.
enable_fbc does not seem to be supported by the i915 version in Lucid:
Code:
parm: modeset:int parm: fbpercrtc:int parm: powersave:int parm: lvds_downclock:int
Enabling only lvds_downclock still resuts in major problems with my system: Again, plymouth looks wrong (including barely visible cryptsetup prompt) and gdm is not shown. Furthermore, now attempting to ctrl-alt-F1 to get to a console results in a corrupt "rainbow" pattern on the bottom left of both screens, or just the laptop panel if the machine is booted with the Dell display switched off, instead of the console.
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