[all variants] Blank hdmi external display outside of X

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http://ubuntuforums.org – Hi there. It's more a hardware problem than an Ubuntu problem, I think, but maybe there is a workaround. I'm using a HP DV7-1145ef laptop with a HDMI output. I'm also using an external display (HP 2275W) with a DVI input. Both are linked with a HDMI/DVI cable. I configured X and the dual screen works fine. But, it's working only under X. If I switch to a console tty the external screen goes to sleep mode (not the same as if I unplug it). It seems it gets no signal from the laptop. Also, the external screen stays blank during the booting process. It only gets a signal when GDM is fired up. Maybe that's normal (it's my first external screen plugged on a laptop). Maybe it's due the HDMI interface. Is there a way to configure something so I can see the boot process (because most of the time I let the laptop closed with papers on it :p). Best regards. (Hardware)