[Bug 93505] GPU HANG: ecode 6:0:0x87e8fffd, in Xorg [4626], reason: Ring hung, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93505

--- Comment #6 from Francois Marier <francois at fmarier.org> ---
(In reply to ykzhao from comment #4)
> Will you please try to add the boot option of "i915.enable_ppgtt = 0"
> and see whether it is helpful?

I've changed /etc/modprobe.d/i915.conf like this:

  --- a/modprobe.d/i915.conf
  +++ b/modprobe.d/i915.conf
  @@ -1,2 +1,2 @@
   #
https://wiki.archlinux.org/index.php/Intel#Module-based_Powersaving_Options
  -options i915 i915_enable_rc6=1 i915_enable_fbc=1 lvds_downclock=1
  +options i915 i915_enable_rc6=1 i915_enable_fbc=1 lvds_downclock=1
enable_ppgtt=0

and rebooted my laptop. Is there an easy way to check that the enable_ppgtt
option is correctly set to 0?

modinfo only shows me the default, not the current value:

  $ sudo modinfo i915 | grep ppgtt
  parm:           enable_ppgtt:Override PPGTT usage. (-1=auto [default],
0=disabled, 1=aliasing, 2=full) (int)

Speaking of boot options, it looks like "i915_enable_rc6", "i915_enable_fbc"
and "lvds_downclock" aren't part of the "modinfo -p i915" output. I guess I
should remove them?

The first two however do exist without the "i915_" prefix but maybe I should
with the defaults?

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