[Bug 61115] When using vgaswitcheroo intel i915 goes to black.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61115

--- Comment #5 from Aximab <laurent.debian at gmail.com> ---
For a related bug [55311] https://bugzilla.kernel.org/show_bug.cgi?id=55311
It seems to be fixed by the following simple patch which only comment a call to
the " intel_panel_disable_backlight" function ...But I am just a end-user so
you may want to know what developpers think before trying this...


# git diff  HEAD drivers/gpu/drm/i915/intel_lvds.c: 



--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -217,7 +217,7 @@ static void intel_disable_lvds(struct intel_encoder
*encoder)
                stat_reg = PP_STATUS;
        }

-       intel_panel_disable_backlight(dev);
+/*        intel_panel_disable_backlight(dev); */

        I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
        if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))

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