[Bug 112315] 5.3.11 regression: No RC6 on Kaby Lake

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112315

--- Comment #14 from Tim Richardson <tim at tim-richardson.net> ---
It was marked as a security issue and was back-ported by most/all
distributions. I think you can assume this will be in all future kernels, it
would be a brave distribution that reverted a CVE. I hope they are just as fast
with the eventual fix. 


I hate the power impact; I like to feel ok with 6 hours away from power since
that happens to me a few times a week. Disabling it is a one line hack to
drivers/gpu/drm/i915/i915_drv, e.g.

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index e7b7c5159378..9dd001bf96e6 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2295,7 +2295,7 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_BROKEN_CS_TLB(dev_priv)    (IS_I830(dev_priv) ||
IS_I845G(dev_priv))

 #define NEEDS_RC6_CTX_CORRUPTION_WA(dev_priv)  \
-       (IS_BROADWELL(dev_priv) || IS_GEN(dev_priv, 9))
+       (IS_BROADWELL(dev_priv) || IS_GEN(dev_priv, 999999))

 /* WaRsDisableCoarsePowerGating:skl,cnl */
 #define NEEDS_WaRsDisableCoarsePowerGating(dev_priv) \

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