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DRM backend does not buffer support modifiers for composition bypass

Submitted by Eero Tamminen

Assigned to Wayland bug list

Link to original bug (#106732)

Description

Recent Weston (git) versions composite fullscreen applications. The gfx stack that I'm using, supports modifiers and atomic mode setting in case that matter.

This didn't happen with last year Weston version (with a gfx stack that didn't yet have support for modifiers or atomic modesetting), so this is a (performance & power usage) regression.

This is on Intel HW (Broxton, Skylake...).

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