Bug#567747: workaround for no-video on i915: vga=ext

[xdrudis <xdrudis@tinet.cat>]

On Sun, Feb 14, 2010 at 12:39:36PM +0100, Erich Schubert wrote:
> Hi,
> I added vga=ext to my boot parameters, and with that my system boots
> fine (although not in the usual vga=ext 50 lines vga mode, but it DOES
> activate my i915 framebuffer?!? it's definitely running the native
> 1440x900 resolution of my screen.)
> Maybe this prevents efifb from running (or resets the video after
> GRUB?), and thus allows i915 to get the video device properly?
> 

Thank you. I have tried and it also works for me (with the forcelvds patch, 
because otherwise inteldrmfb thinks my laptop lid is closed and no use drawing
any screen). 

If I pass to the kernel vga=ext instead of video=i915 I boot in text mode, but afterwards
X loads fine and I can switch vts smoothly (Ctrl-Alt-F1, Ctrl-Alt-F7). Must be KMS. Efifb 
does no longer appear in logs, and fb0 is inteldrmfb. 

If I use both parameters vga=ext and video=i915 it boots in graphical mode 
and X loads fine, KMS fine.

I'll try 2.6.32-9 when it gets to sid, to see if that works even without vga=ext.