[Bug 114431] New: Skylake GPU hangs with kernel oops when 3D acceleration is used

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=114431

            Bug ID: 114431
           Summary: Skylake GPU hangs with kernel oops when 3D
                    acceleration is used
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4.5
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chais.z3r0 at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 208711
  --> https://bugzilla.kernel.org/attachment.cgi?id=208711&action=edit
Kernel Oops

For quite some time now I've been struggling to get stable hardware
acceleration from my Core i5 6600K. I'm running Arch on an MSI Z170A GAMING M7
mainboard.
Whenever I try to use hardware acceleration on the IGD (chromium, glxgears) the
display will just freeze. I can still log in remotely and the machine works
fine otherwise. dmesg will contain an oops like the one attaached.

I had this working briefly with 4.4.3, but after the first hang downgrading
wouldn't help either.
My current /proc/cmdline:

initrd=/initramfs-linux.img initrd=/intel-ucode.img rw <luks-setup>
root=/dev/mapper/e1
rootflags=subvol=root,device=/dev/mapper/e1,device=/dev/mapper/e2,compress=lzo
intel_iommu=on intel_iommu=igfx_off i915.preliminary_hw_support=1

The preliminary_hw_support is what made things work with 4.4.3.
My current i915 modprobe:
options i915 enable_rc6=1 enable_fbc=1 lvds_downclock=1 semaphores=1

As suggested by https://wiki.archlinux.org/index.php/Intel_graphics I tried
booting with i915.enable_rc6=0 (also removing the option from the
modprobe.conf) but without success. Also i915.enable_execlists=0 or switching
to uxa acceleration didn't help. So far the only thing that reliably lets me
use the machine is disabling DRI. But since that forces me to move the mouse
for the screen to refresh at all that's not really an option. Watching movies
while constantly jiggling the mouse is more than just tedious.
I can't find any related errors in the Xorg log.

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