Hi Darren,
Looks like the Apple issue with backlight working on hidden Intel IGP
(doing IO on VGA addresses) while graphics are running on visible
discrete GPU (Radeon this time instead of usual nvidia).
I should have offered a solution quite some time ago but it seem time
was running very fast.
Bruno, can you please have a look at the following regression attributed to:
4eebd5a apple-gmux: lock iGP IO to protect from vgaarb changes
2015-03-18 (7 months ago), Bruno Prémont
On Thu, Oct 15, 2015 at 04:47:13AM +, bugzilla-dae...@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.o
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