[Bug 94161] [skl rc6] GPU HANG

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94161

--- Comment #12 from Mikael Djurfeldt <mikael at djurfeldt.com> ---
I tested this both with Linus rc4 and drm-intel-nightly from today (rc7).
In both cases I still experience a GPU hang with the single (apart from
noresume) kernel cmd line option intel_iommu=igfx_off.

For rc4, I saw a new error code, though:

Mar 10 14:27:46 hat kernel: [   56.843611] [drm] GPU HANG: ecode
9:0:0x87f99ff9, in gnome-shell [1742], reason: Ring hung, action: reset

I attach the corresponding crash dump file.

This means that the only way, so far, to avoid hangs is i915.enable_rc6=0.
I have confirmed that this is also true for rc7 (drm-intel-nightly).

On Thu, Mar 10, 2016 at 2:13 PM, <bugzilla-daemon at freedesktop.org> wrote:

> *Comment # 11 <https://bugs.freedesktop.org/show_bug.cgi?id=94161#c11> on
> bug 94161 <https://bugs.freedesktop.org/show_bug.cgi?id=94161> from
> oddrunesl at gmail.com <oddrunesl at gmail.com> *
>
> adding intel_iommu=igfx_off and removing rc6=0 frpm kernel boot parameters of
> 4.5-rc4 reintroduces hang problems.
>
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