[Bug 73559] [hsw] KMS does not work on Dell XPS 8700

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73559

--- Comment #11 from comes at naic.edu ---
May be this will help:
If only one monitor is connected to the PC one fb device is created:

cat /sys/devices/pci0000:00/0000:00:02.0/graphics/fb0/name
  inteldrmfb

But if I connect two monitor: DP1, HDMI2 then two framebuffers appears:

cat /sys/devices/platform/efifb.0/graphics/fb0/name
  EFI VGA

cat /sys/devices/pci0000:00/0000:00:02.0/graphics/fb1/name
  inteldrmfb

Can it be that this "EFI VGA" framebuffer is what makes drm_setup_crtcs() think
that a CRT is connected even if it isn't?

Also when two monitors are connected vt01 is unreadable
the background is a pattern of black and white vertical stripes
and the text is scrambled. vt02 and higher are ok.
cat /sys/devices/platform/efifb.0/graphics/fb0/virtual_size
  640,350
this makes grub2 use such resolution to display the boot menu (with only
one monitor grub2 uses the proper monitor resolution).

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