Unity8 falls back to software rendering on Intel GPUs [intel_miptree_blit: Can't use hardware blitter from MESA_FORMAT_R8G8B8A8_UNORM to MESA_FORMAT_A_UNORM8, falling back. intelCopyTexSubImage - fallback to swrast]

Bug #1583949 reported by Daniel van Vugt on 2016-05-20
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Canonical System Image
High
Unassigned
qtdeclarative-opensource-src (Ubuntu)
High
Unassigned
qtubuntu (Ubuntu)
High
Unassigned
unity8 (Ubuntu)
High
Unassigned

Bug Description

Unity8 falls back to software rendering, confirmed the same error on both low-end and high-end Intel graphics: Diamondville Atom N270 netbook and Haswell i7-4770 desktop:

intel_miptree_blit: Can't use hardware blitter from MESA_FORMAT_R8G8B8A8_UNORM to MESA_FORMAT_A_UNORM8, falling back.
intelCopyTexSubImage - fallback to swrast

Noticed in unity8.log after adding environment INTEL_DEBUG=perf

Daniel van Vugt (vanvugt) wrote :

Atom chips also experience additional fallbacks to software rendering, described in bug 1580792.

summary: - Unity8 falls back to software rendering [intel_miptree_blit: Can't use
- hardware blitter from MESA_FORMAT_R8G8B8A8_UNORM to
- MESA_FORMAT_A_UNORM8, falling back. intelCopyTexSubImage - fallback to
- swrast]
+ Unity8 falls back to software rendering on Intel GPUs
+ [intel_miptree_blit: Can't use hardware blitter from
+ MESA_FORMAT_R8G8B8A8_UNORM to MESA_FORMAT_A_UNORM8, falling back.
+ intelCopyTexSubImage - fallback to swrast]
Daniel van Vugt (vanvugt) wrote :

unity8.log and unity8-dash.log both share this warning message

Daniel van Vugt (vanvugt) wrote :

Just searching for potential users of glCopyTexSubImage, found:
  qtdeclarative-opensource-src
  qtubuntu
So far...

Changed in qtdeclarative-opensource-src (Ubuntu):
importance: Undecided → High
Changed in qtubuntu (Ubuntu):
importance: Undecided → High
tags: added: unity8-desktop
Daniel van Vugt (vanvugt) wrote :

This is still happening on yakkety, with Intel Haswell desktop graphics.

Changed in canonical-devices-system-image:
importance: Undecided → High
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