On Mon, Jun 09, 2014 at 10:06:29PM +0300, Jani Nikula wrote: > On Mon, 09 Jun 2014, Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> wrote: > > On Mon, Jun 09, 2014 at 09:12:18PM +0300, Jani Nikula wrote: > >> On Fri, 06 Jun 2014, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > >> > It causes black screen on bootup and is approximately 100x slower than > >> > running with FBC disabled, so the GPU runs at a high frequency for much > >> > longer - completely contrary to the power saving claims. It also still > >> > has mutex deadlocks in multi-head scenarios, which can lead to a > >> > system/X lockup. These bugs were known before FBC was enabled by default > >> > on Haswell and still have not been fixed. > >> > > >> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79716 > >> > Reported-and-tested-by: Jon Kristensen <info@xxxxxxxxxx> > >> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > >> > Cc: stable@xxxxxxxxxxxxxxx > >> > --- > >> > drivers/gpu/drm/i915/intel_pm.c | 3 +-- > >> > 1 file changed, 1 insertion(+), 2 deletions(-) > >> > > >> > diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c > >> > index e403010540a5..0b8a6010427e 100644 > >> > --- a/drivers/gpu/drm/i915/intel_pm.c > >> > +++ b/drivers/gpu/drm/i915/intel_pm.c > >> > @@ -511,8 +511,7 @@ void intel_update_fbc(struct drm_device *dev) > >> > obj = intel_fb->obj; > >> > adjusted_mode = &intel_crtc->config.adjusted_mode; > >> > > >> > - if (i915.enable_fbc < 0 && > >> > - INTEL_INFO(dev)->gen <= 7 && !IS_HASWELL(dev)) { > >> > + if (i915.enable_fbc < 0) { > >> > >> Not only does this disable FBC by default on Haswell but also on all > >> current and future platforms, including Broadwell. Shouldn't you leave > >> the INTEL_INFO(dev)->gen <= 7 part intact? > > > > The current FBC code is universally broken. > > Well, then the commit message should reflect that! :p s/Haswell/Haswell+/ and it's correct ;-) -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
