On 21/01/2020 14:11, Thomas Preston wrote:
> We're actually debugging this to close-in on *another* ZaphodHead+TearFree
> issue which appears on a 4.14 kernel (among other userland upgrades). At
> some point :0.0 head gets stuck between two buffers (current + shadow) and
> switches between the two causing a flicker or ghosting effect. It's
> possibly got something to do with these patches:
>
> 8bfac0f2 sna/dri2: Only force the TearFree/swcursor hack when using
> TearFree
> 26f8ab54 sna: Restore local damage processing for
> TearFree/DRI2/swcursor early
> 7cf67022 sna/dri2: Prevent the sw cursor from copyig to a buffer as we
> discard it
>
> and it goes away when `-Dasync-swap=true` (APPLY_DAMAGE is 0) or we set:
>
> sna->ignore_copy_area = false; //sna->flags & SNA_TEAR_FREE;
>
fyi the following patch fixes the flickering issue, so we just moved to
upstream + our struct sna fixup in sna_mode_wakeup
95ea0564 sna: Rebalance prefer_blt to weight I915_TILING_Y higher
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