As of "drm/i915: Refactor work that can sleep out of commit (v7)", commit hash listed below, there is a lot of display flicker seen when cursor sizes change on gen8. The original fix was made here and is present in recent Chromium OS kernels: commit 64f962e3e38bf6f40bbd2462f8380dee0369e1bf Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Mar 26 12:38:15 2014 +0000 drm/i915: Recompute WM when the cursor size changes However, the recompute logic apparently got lost in refactoring, on around this point: commit 32b7eeec4d1e861230b09d437e95d76c86ff4a68 Author: Matt Roper <matthew.d.roper@intel.com> Date: Wed Dec 24 07:59:06 2014 -0800 drm/i915: Refactor work that can sleep out of commit (v7) Let's add the relevant code back. I'm rounding some edges on a patch, to land on the mailing list soon.
Submmited to mailing list: http://lists.freedesktop.org/archives/intel-gfx/2015-February/060837.html
Without this patch, on gen8 running Chromium OS Ozone/Freon, severe graphical corruption can occur in the form of extreme flickering, rendering graphics unusable. (In reply to Joe Konno from comment #0)
Thanks Matt! Looks like danvet merged these two patches, which appear to fix the original regression. "Tested-by: Joe Konno <joe.konno@intel.com>" fd2d61341bf3 drm/i915: Use plane->state->fb in watermark code (v2) fd514b5d872c drm/i915: Kill intel_crtc->cursor_{width, height} (v2)
Great, thanks for the confirmation. Moving to resolved. I'll add the patchwork links here too for future reference: http://patchwork.freedesktop.org/patch/43592/ http://patchwork.freedesktop.org/patch/43593/
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