[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 #13 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to comment #11)
> 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).

Just to confirm: the bug still happens on both cases, with and without 2
monitors, right?

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