[Bug 105468] Radiant P845 does not have LVDS, only VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105468

--- Comment #5 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Rodrigo Vivi from comment #4)
> VBT is there...
> Maybe you don't have the debugfs configured and mounted?
> [    6.084841] [drm:intel_bios_init] VBT signature "$VBT MONTARA-GM     ",
> BDB version 114

Old platforms don't have opregion, so our debugfs based VBT dumper doesn't
work. One needs to use intel_bios_dumper from intel-gpu-tools. We should
probably fix the debugfs code to dtrt on these platforms as well...

> 
> But yeap, something odd with the VBT there:
> [    6.084883] [drm:intel_opregion_get_panel_type] Failed to get panel
> details from OpRegion (-19)
> 
> What is strangest is that LVDS detection not only comes from VBT, but also
> is detected as connected later.

The lack of opregion explains that too I believe. Although the logic is quite
convoluted so you have to read the code rather carefully to see it.

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