Flickering with Intel i7-5700 (HD 5600) and Samsung 156HL01-102 panel

Hi,

My new MSI PE60 2QE laptop mounts an Intel i7-5700HQ, which carries the
Integrated Graphics Chipset 5600, and a Samsung 156HL01-102 panel.
The display works perfectly when I boot with the "nomodeset" parameter in
the kernel command line -- but then I'm forced to use the framebuffer
driver, which doesn't allow multiple monitors.

With KMS enabled (by removing the "nomodeset" parameter), X starts
correctly with the "intel" driver and I can use multiple monitors, but the
laptop's panel shows an irregular flicker, ranging from occasional
flickering horizontal black lines (which are really annoying) to a constant
flashing & flickering making the display all but unusable.

The flickering and flashing is less noticeable, but still there, in the
text-mode VTs, even if I never start X. So the problem has to be in the
kernel or modules, not in the X drivers.

External monitors connected to the DP or HDMI ports don't show any
flickering.
Things I have tried (among many others I've discovered were irrelevant):

   - Setting a number different video modes using xrandr
   - Booting with Kernel 3.19.0.25 with i915.enable_IPS=0 as suggested
   here: Screen flickering on Ubuntu Gnome 14.04 - 4K resolution
   <http://askubuntu.com/questions/680703/screen-flickering-on-ubuntu-gnome-14-04-4k-resolution>
   - Booting with i915.powersave=0
   - Booting with acpi_osi=Linux
   - Upgrading to Ubuntu Vivid Vervet (kernel 3.19.0 with a backported i915
   module)
   - Upgrading to Ubuntu Willy Werewolf (kernel 4.2.0)

None of these have helped.

I'm attaching kern.log for a full boot sequence with drm.debug=0xf.

What steps can you recommend to try to diagnose and solve this problem?
Thanks a lot for your help,

Jordi

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