[Bug 94529] New: Skylake GPU hangs with kernel oops when 3D acceleration is used

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94529

            Bug ID: 94529
           Summary: Skylake GPU hangs with kernel oops when 3D
                    acceleration is used
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chais.z3r0 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 122273
  --> https://bugs.freedesktop.org/attachment.cgi?id=122273&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.

As suggested by https://wiki.archlinux.org/index.php/Intel_graphics I tried
booting with i915.enable_rc6=0 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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