I'm running a QtQuick application using shaders on an older Intel(R) Atom(TM) CPU N270 @ 1.60GHz with Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller.
My setup is
* Ubuntu 16.04 (32-bit)
* Qt 5.9.2
* Mesa: 17.4.0
* Intel i8xx, i9xx display driver: 2.99.917
* XServer: 1.18.4
The test application is the QtQuick samegame example. When I start the app with the INTEL_DEBUG=perf env variable i get the following messages
.... ENTER FALLBACK 10000: Program LEAVE FALLBACK Program i915_program_error: Exceeded max nr indirect texture lookups (6 out of 4) ...
and the CPU load goes up to 100% and the app reacts very slow. Btw. is there another debugging/tracing configuration which i can use to narrow down the problem a bit more?
With the perf or oprofile tool I see that the most CPU time is consumed by i915_dri.so.
Are there any known regressions regarding QtQuick/Qt 5/Shaders and the i915 driver on Ubuntu 16.04.
Regards
-
Benjamin Federau
--
M.Sc. Benjamin Federau
Integration Engineer
basysKom GmbH
Robert-Bosch-Str. 7 | 64293 Darmstadt | Germany
benjamin.federau@xxxxxxxxxxxx | www.basyskom.com
Handelsregister: Darmstadt HRB 9352
Geschaeftsfuehrung: Dr.-Ing. Eva Brucherseifer, Heike Ziegler
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