[Bug 59841] [IVB cpu eDP] panel is broken due to 657445fe86 (eDP bpp clamping)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=59841

--- Comment #113 from Alexey <kovyale at gmail.com> ---
Hi Jkp!

The same code rearrengment works for 3.11.

As for the brightness i use acpi_osi= kernel arg and my patch which disables
changin brighness by i915 driver itself via acpi calls. I prefer to controls
brightness via scripts using /sys/class/backlight/intel_brightness/*

$ cat i915-disable-acpi-backlight-change.patch 
--- drivers/gpu/drm/i915/intel_opregion.c.orig  2013-09-03 00:46:10.000000000
+0400
+++ drivers/gpu/drm/i915/intel_opregion.c       2013-09-03 18:50:33.563873398
+0400
@@ -160,6 +160,7 @@
 #ifdef CONFIG_ACPI
 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 {
+       /*
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct opregion_asle __iomem *asle = dev_priv->opregion.asle;

@@ -174,6 +175,7 @@

        intel_panel_set_backlight(dev, bclp, 255);
        iowrite32((bclp*0x64)/0xff | ASLE_CBLV_VALID, &asle->cblv);
+       */

        return 0;
 }


For Arch you may find patched kernels at
https://aur.archlinux.org/packages/?SeB=m&K=alexey

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