Most of the rc6-related hangs and major issues were addressed for the past months. Let's re-enable it by default to provide a more wider testing, and catch the remaining problems. According to tests, enablement of rc6 results in up to +50% improvements in power usage and battery life, so it certainly would be a nice feature to have enabled by default. Also, most of the issues related to rc6 seem to came from VTd, so if you are experiencing any problems with it, try disabling VTd in bios or using intel_iommu=off kernel parameter to investigate whether it solves the issue. Acked-by: Keith Packard <keithp at keithp.com> CC: Daniel Vetter <daniel.vetter at ffwll.ch> CC: Jesse Barnes <jbarnes at virtuousgeek.org> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38567 Signed-off-by: Eugeni Dodonov <eugeni.dodonov at intel.com> --- drivers/gpu/drm/i915/i915_drv.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 71f887a..f72f65d 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -63,7 +63,7 @@ module_param_named(semaphores, i915_semaphores, int, 0600); MODULE_PARM_DESC(semaphores, "Use semaphores for inter-ring sync (default: true)"); -unsigned int i915_enable_rc6 __read_mostly = 0; +unsigned int i915_enable_rc6 __read_mostly = 1; module_param_named(i915_enable_rc6, i915_enable_rc6, int, 0600); MODULE_PARM_DESC(i915_enable_rc6, "Enable power-saving render C-state 6 (default: true)"); -- 1.7.7.3
