[Bug 26891] Radeon KMS fails with inaccessible AtomBIOS on systems with (U)EFI boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=26891

--- Comment #27 from Alex Deucher <agd5f at yahoo.com> 2012-08-03 19:23:34 UTC ---
(In reply to comment #26)
> Created attachment 65100 [details] [review]
> hacked-up radeon VFCT BIOS access patch
> 
> So the good news is that a VFCT ACPI table does indeed show up when I boot
> under UEFI native mode on the HP EliteBook.
> 
> I hacked up some code to get the BIOS from there and it successfully brought up
> the card and drove my DisplayPort screen. (hack patch attached)
> 

Excellent.

> The bad news is that the LVDS panel first went backlight-off, on starting X
> started displaying flickering pixelgarbage and at some later point the entire
> box locked up.

You probably need this patch:
http://lists.freedesktop.org/archives/dri-devel/2012-July/025567.html

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