Comment 6 for bug 850895

WarriorIng64,

From the context of your AskUbuntu thread, I understand that the root issue here is a mismatch between your video card's preferred VBE mode (as returned by the 'vbeinfo' command in grub2) and the modes supported by your external monitor. If you are seeing the splash at shutdown but only see the "No signal" error during startup, followed briefly by the mountall message and then X, there are a couple of different possibilities.

 - the nouveaufb kernel driver may be using the preconfigured resolution passed to it by grub. If so, this is arguably a bug in the kernel driver; it should instead be probing with EDID to find a resolution supported by the external monitor.
 - the kernel driver may be fine, but plymouth is starting so late that it doesn't matter because you never see it on startup (bug #540801).

Please try the following and report back the results:
 - run 'echo FRAMEBUFFER=y | sudo tee /etc/initramfs-tools/conf.d/framebuffer && sudo update-initramfs -u', then reboot. If you then see the plymouth splash on startup, this confirms that you're seeing bug #540801.
 - boot with plymouth:debug=file:/var/log/plymouth-debug.log added to your kernel commandline and attach the resulting log file to this bug.
 - check the configuration used in X with 'xrandr', and configure grub to use the same mode by setting GRUB_GFXMODE in /etc/default/grub and running update-grub.