Do you mean auto luminance or auto brightness?
This is ToastyX photo of comparison monitors with and without "glow".
I would never call this IPS glow as *VA panels have worse glow.
This definition is an internal invention of this forum. That's why it confuses you.
I would call this just LCD glow.
2490/2690 miraculously are free of LCD glow (actually have minimal violet/bluish tint of black in darkness - what older IPS and modern PVA have in full). This is usually attributed to co-called polarizer that some H-IPS monitors have. Violet tint of black is visible from a sharp diagonal angle from the right hand side only. "Non-polarized" IPS and *VA have equal violet/bluish tint of black from both sides.
Unfortunately you don't have 2490/2690 with A-TW H-IPS to compare.
Thank you, I remember that link about H-IPS. But it's strange that H-IPS is not mentioned on major websites. This is a big advantage and it must have been on the front pages.
I can notice black turning violet quite well and even on not-so-extreme angle on 2690. But only when looking right to left (left corner), not left to right. I noticed you post screens of 2690 (or 2490) taken from left to right, which does not show the violet tint.
*VAs which I tested don't seem to suffer from black turning blue or violet, but the glow and the loss of detailf in dark tones were obvious.