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Subject[PATCH 2/2] drm/i915: Disable RC6 on Sandybridge by default
Date
RC6 fails again.

> I found my system freeze mostly during starting up X and KDE. Sometimes it
> works for some minutes, sometimes it freezes immediatly. When the freeze
> happens, everything is dead (even the reset button does not work, I need to
> power cycle).

> I disabled RC6, and my system runs wonderfully.

> The system is a Z68 Pro board with Sandybridge i5-2500K processor, 8
> GB of RAM and UEFI firmware.

Reported-by: Kai Krakow <hurikhan77@gmail.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
---
drivers/gpu/drm/i915/intel_display.c | 8 +++-----
1 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8a61b81..4b7a0f2 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7922,13 +7922,11 @@ static bool intel_enable_rc6(struct drm_device *dev)
return 0;

/*
- * Enable rc6 on Sandybridge if DMA remapping is disabled
+ * Disable rc6 on Sandybridge
*/
if (INTEL_INFO(dev)->gen == 6) {
- DRM_DEBUG_DRIVER("Sandybridge: intel_iommu_enabled %s -- RC6 %sabled\n",
- intel_iommu_enabled ? "true" : "false",
- !intel_iommu_enabled ? "en" : "dis");
- return !intel_iommu_enabled;
+ DRM_DEBUG_DRIVER("Sandybridge: RC6 disabled\n");
+ return 0;
}
DRM_DEBUG_DRIVER("RC6 enabled\n");
return 1;
--
1.7.7.3


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