I have a Lenovo 230 notebook with an LCD attached to the docking station and an external 24" screen connected to the very same station. As long as the 24" screen is offline (switched of) the Plymouth boot screen is correctly scaled at 1366x768 in the notebooks LCD -- which is the primary screen. But in case the system is booted with the 24" monitor connected and enabled (switched on) -- which is the secondary screen -- the LCD shows the boot screen displaced in the upper left corner. About 30% of the primary LCD screen are black. The boot screen on the 24" screen is in a wrong resolution at that time and not the recommended 1920x1200.
I have a Lenovo 230 notebook with an LCD attached to the docking station and an external 24" screen connected to the very same station. As long as the 24" screen is offline (switched of) the Plymouth boot screen is correctly scaled at 1366x768 in the notebooks LCD -- which is the primary screen. But in case the system is booted with the 24" monitor connected and enabled (switched on) -- which is the secondary screen -- the LCD shows the boot screen displaced in the upper left corner. About 30% of the primary LCD screen are black. The boot screen on the 24" screen is in a wrong resolution at that time and not the recommended 1920x1200.