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

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

--- Comment #31 from David L. <equinox-freedesktopbugs@xxxxxxxxxx> 2012-08-03 23:21:21 UTC ---
(In reply to comment #30)
> (In reply to comment #29)
> > Is the lvds console display shifted if you don't connect any external monitor ?
> 
> So far I only got the LVDS to display anything by connecting the DP monitor, so
> I don't really know.  I didn't try much there... I'll try some other magic
> incantations/plug sequences tomorrow, maybe there's a sequence to get LVDS-only
> with it actually showing something.
> 
> Starting X while the LVDS is off works fine, reenabling it.

Correction: I just had a hard freeze after an hour or so of X use.

Since I need to get some things done, I've booted in hybrid UEFI mode now with
only the brightness patch applied.  The LVDS-blank-after-insmod issue is gone,
so it's not the backlight control I guess.

Also, interestingly, the power consumption of the laptop was considerably lower
under UEFI native mode (24W) vs. UEFI hybrid mode (29W).  Could be either the
CRTC programming patch or something completely unrelated.

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