[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 #28 from David L. <equinox-freedesktopbugs at diac24.net> 2012-08-03 21:17:10 UTC ---
(In reply to comment #27)
> > 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

After both patches, that indeed fixes things as soon as X is started, but the
console is still broken.  After loading the module, the panel just switches
off, though the console is still usable.  Plugging my DisplayPort screen in
also reenables the LVDS panel, although the image is wrapped around by around
100 pixels. (Left part of my prompt is on the right of the screen.)  
Wraparound might be related to the different resolution for the ext display;
the external screen only shows the nonwrapping part of the image (and is
therefore missing the first characters of the prompt).  Either way that's a
separate bug...


Apart from the above, I now have working graphics (including 3D) on an UEFI
native booted HP EliteBook.  I'll clean up my hack VFCT patch and send it to
dri-devel.


P.S.: The laptop also needs your backlight control patch, thanks a zillion for
that - you wouldn't believe how nuts that was driving me.

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