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drm/i915: Disable RC6 on Sandybridge by default

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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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Keith Packard 2011-12-26 17:02:11 -08:00 committed by Linus Torvalds
parent ebbd857e6b
commit 371de6e4e0
1 changed files with 3 additions and 5 deletions
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8
drivers/gpu/drm/i915/intel_display.c
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@ -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;