OpenCL troubleshooting steps

[ady]

QA Team,

In the TDF wiki, the steps about OpenCL troubleshooting are incorrect
– just attempt to follow them and you will see:

 <https://wiki.documentfoundation.org/QA/FirstSteps#Computation-related_issues_in_Calc_(_OpenCL_)>

Unfortunately, I have no idea what to correct. I am a common user, not
a developer. There is only 1 OpenCL setting that I know of. Step 3 is
unintelligible, so that step and the next ones cannot be followed by
common users.

As for the OpenCL log and xml files, they exist when the one-and-only
setting for OpenCL is ON (which I discovered incidentally only). So
again, any common user trying to follow these steps cannot really know
what to do for troubleshooting.

What I was able to do:
* Set the OpenCL setting to either checked or unchecked.
* Search for some "*opencl*.*" files somewhere; it turns out that the
log and xml files exist when the option is ON only, and their contents
are always the same (for each hardware).


Bug 161048 (now fixed from my POV) depends on the OpenCL setting, but
it has nothing to do with any amount of formulas (as the note in that
wiki section points out). For troubleshooting purposes, the note,
while not incorrect, is incomplete and it might be deceiving or it
might confuse users into disregarding OpenCL as a potential source of
the problem for their (troubleshooting) case.

IMHO, the whole section about OpenCL needs a review for correctness,
accuracy and usefulness.

Could someone from the QA team please improve that wiki section for
common users?

Thank you,
Ady.