** Tags removed: i915 ** Tags added: performance -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ubuntu-ui-toolkit in Ubuntu. https://bugs.launchpad.net/bugs/1585723
Title: UbuntuShape on intel i915 (Atom) uses fallback CPU rendering Status in ubuntu-ui-toolkit package in Ubuntu: Confirmed Bug description: I'm digging into unity8 performance problems on older generation Intel GPUs - specifically i915 Atom GPUs. I've tested a simple QML file with a single empty UbuntuShape in it: import QtQuick 2.4 import Ubuntu.Components 1.3 Rectangle { width: 400 height: 300 color: "blue" UbuntuShape {} } Running it with INTEL_DEBUG=perf env var set, I get this output: i915_program_error: Exceeded max ALU instructions (76 out of 64) ENTER FALLBACK 10000: Program Mapping a busy BO, causing a stall on the GPU. which implies that MESA was unable to compile one of the UbuntuShape shaders as it created more ALU instructions than the GPU could deal with. MESA falls back to CPU rendering as a result. The GPU stall message I guess is related to that. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-ui-toolkit/+bug/1585723/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp