[Bug 55311] Since 3.7.1-17.1 radeon has no backlight when using vgaswitcheroo (regression)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=55311

--- Comment #69 from jimis hol <hol.jimis at gmail.com> ---
Even if status of this bug is "RESOLVED CODE_FIX" I would like to report, that
problem reappeared.
I updated world on gentoo staying with gentoo-sources-3.10.0 where i applied
succesfully the patch of comment 53. Unfortunately after some "update world",
that involved xorg-server and video intel and radeon drivers, i got black
screen when i try to switch to radeon (assuming no blacklight). I updated to
3.11.2, i see the patch at intel_panel.c but still no blacklight with radeon
after switch. I tried deleting 

list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
        dev_priv->display.crtc_disable(crtc);

lines of i915_drv.c, even getting

 DRM_DEBUG_DRIVER("Skipping backlight disable on vga switch\n");
        return;

out of "if" statement at intel_panel.c without luck.
I tried downgrading intel by masking >x11-drivers/xf86-video-intel-2.21.13
and failing that, i downgraded xorg-server with #>x11-base/xorg-server-1.14.2 .
No luck. Seems, once again, that on switching to radeon backlight of intel sets
off.
I also tried adding (after switching) intel backlight at xorg.conf.d with
 Section "Device"
  Identifier "video"
  Driver "radeon"
Option "Backlight" "intel_backlight"
EndSection

Of cource the "switch" file at vgaswitcheroo do exist.
As i noted, initially when problem reappeared, i had the same working patched
kernel 3.10.0. So, maybe it isnt kernel's issue. If so, and if someone reads
this, pls open a proper bug or inform me to do so here or in bugs.gentoo.org.
Thank you

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