The M17 presented this profile during our calibration tests: and the cause? Once opened it up, we found the same panel that is in the E17.
Curiously, the calibration profile differed from that of the E17 - even when we set contrast and brightness to exactly the same levels. The darker shades were poorly rendered.
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Header Cell - Column 0
Black Spot
White Spot
Contrast
AG Neovo M17
0.53
198
373 :1
Of course, these results are very close to those of the E17. Black level is always average and brightness always borderline.