On Sat, May 28, 2011 at 01:50:12AM -0700, SD wrote: > > > --- On Fri, 5/27/11, Ben Widawsky <b...@bwidawsk.net> wrote: > > > From: Ben Widawsky <b...@bwidawsk.net> > > Subject: Re: [Intel-gfx] frame buffer compression and 915GM > > To: "SD" <sd.dom...@yahoo.com> > > Cc: intel-gfx@lists.freedesktop.org > > Date: Friday, May 27, 2011, 11:48 PM > > On Fri, May 27, 2011 at 01:51:53AM > > -0700, SD wrote: > > > OK, thank you. I checked it, and I got unexpected > > answer - > > > > > > FBC unsupported on this chipset. > > > > I'd need to know exactly which chipset you have. For > > example. Ironlake > > mobile, we disabled FBC because it was actually consuming > > more power. > > > > You can check your specific chipset, and look at the > > has_fbc field here: > > drivers/gpu/drm/i915/i915_drv.c > > > > Ben > > > > Thanks. > I checked it out. > You threw FBC from i915_drv since 2.6.33, because in 2.6.32 there was not any > sign of pci_id detection. And since then I got awful screen picture quality, > because I start to test with Fedora 12 and then jumped to Fedora 13 with 33 > kernel, and since then never had normal picture - always flickers. > > I know you are all very clever here and are thinking about some Watts, but I > am, like a user, thinking about my eyes first and want to tell you that you > did mistake. > May be FBC uses more power (I am not sure about it, as long 3D performance on > i915gm is "nothing" anyway), but it looks like FBC helps to produce nice and > smooth picture on laptop LSD.
I don't think FBC should have any positive impact on the display, but I suppose that is a subjective thing. You should see Jesse's commit in keithp's drm-intel-next (c1a9f047638b27e481d097910604316b8a0d132b). If you're capable of writing code, I'd suggest you do the same thing for intel_i915gm_info where fbc can be enabled, but is off by default. If not, hopefully I, or someone else will get around to it eventually. Ben _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
