[Bug 78162] [i7-4600U i915]: constant screen flickering after KMS which correlates with CPU load

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78162

--- Comment #17 from Maxim Konyushikhin <konush at cern.ch> ---
The following temporary workaround prevents screen flickering:

--- intel_dp.c.orig    2014-05-06 16:36:52.969995358 +0200
+++ intel_dp.c    2014-05-06 16:45:11.209995061 +0200
@@ -749,7 +749,7 @@
     }

     for (; bpp >= 6*3; bpp -= 2*3) {
-        mode_rate = intel_dp_link_required(adjusted_mode->clock, bpp);
+        mode_rate = intel_dp_link_required(adjusted_mode->clock, bpp +6);

         for (clock = 0; clock <= max_clock; clock++) {
             for (lane_count = 1; lane_count <= max_lane_count; lane_count <<=
1) {

but now I get the following messages when running an OpenGL application:

[drm:intel_pipe_config_compare] *ERROR* mismatch in
adjusted_mode.flags(DRM_MODE_FLAG_PHSYNC) (expected 0, found 1)
 ------------[ cut here ]------------
WARNING: CPU: 0 PID: 3663 at drivers/gpu/drm/i915/intel_display.c:8853
check_crtc_state+0x65f/0xb50()
pipe state doesn't match!

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