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Thank you for the sample (I

Thank you for the sample (I've checked only EOS cameras, will inspect G9X2 in more depth).

Here is histogram of masked pixels:
(black subtraction turned off).
And here is the same histogram, but zoomed in:

Please note, that only one value of 4 is used (so camera effectively 12 bit at this ISO).

With such high noise (screenshot #1, see histogram bell width) difference in one 'real' level is very hard to see in practice (and I do not see any visible difference between automatic black level and manual set to 2047 or 2048).

-- Alex Tutubalin @LibRaw LLC