https://bugs.freedesktop.org/show_bug.cgi?id=75917
--- Comment #12 from sfievet <sebastien.fievet at free.fr> --- I am affected by this bug too. I have a Acer 3820TG laptop featuring Intel IGP (Ironlake) / AMD DGP (Radeon 6550M). It kept me stucked with kernel 3.12 series until I googled for "backlight issue" rather than "Intel driver issue" and found THIS bug report. :-) adding radeon.runpm=0 to the boot options works for me too. I haven't tested the patch yet. FWIW, I'd like to add 2 side informations hoping it might be related : - the backlight control only works for the Intel IGP. If the laptop goes idle when on the radeon, waking it up doesn't bring the backlight back. - when switching from Ironlake to Radeon through VGA switcheroo, I have to use "ON -> MIGD -> DDIS" sequence as the screen goes black immediately after passing "ON". -- You are receiving this mail because: You are the assignee for the bug. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20140614/9a6367f9/attachment.html>
