On Tue, Mar 22, 2016 at 12:31:09PM +0100, Daniel Vetter wrote: > On Mon, Mar 21, 2016 at 04:26:55PM -0300, Paulo Zanoni wrote: > > The sna_mode_wants_tear_free() function tries to detect FBC and PSR > > based on Kernel module parameters. Currently it fails to detect FBC > > due to the default enable_fbc value being -1. While this can easily be > > fixed in the Kernel, I had a conversation with Daniel and he expressed > > unhappiness with that solution, claiming that yet another different > > code path just for a feature that should be transparent is not a good > > way to go, and that we should do proper frontbuffer rendering. > > > > So with this patch, we'll have the DDX issuing dirtyfb calls even if > > TearFree is not enabled, fixing FBC when i915.enable_fbc=-1. > > > > This fixes a bug that happens on SKL with FBC enabled: if you run > > lightdm, your login/password won't appear as you type on your > > keyboard. You have to move the mouse over the input box for them to be > > displayed. > > > > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > > I thought we need this anyway to get the kernel to allow fbc, since SNA > ends up mmap some of the drm_framebuffer. Even when they're not > frontbuffers. Nope. FBC => sna_mode_wants_tear_free() is true. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
