Just bought U2412m, everything fine, no bright/dark pixel, black level is good, but the problem is white colour not uniform.
At left corner the white appear "yellowish and brighter" than the rest particular noticeable with white background.

Grey background noticeable a little but not as bad as white.

Strangely, other colour, red, green, blue, even black, the colour seems quite ok and uniform.

I don't know this is called bleeding or IPS glow.
It said bleeding, it should be noticeable with black background, but it doesn't.
Only with white/light grey background.

The factory preset is too "yellowish" in the first place, just like many complain the yellow tint issue.
But able to set into proper "white" after refer to icc profile on the net.

I don't know why Dell factory preset being set at so "yellowish" for white.
Their factory ambient lighting?

Last time using U2209WA, 4 monitor all "white" and uniform across, no issue. Don't need to do anything.

For the new U2412m, I need to spend considerable of time to calibrate between the RGB to get the proper "white" using try and error method.

DVI is working fine and start to become general, then suddenly most monitors start to change to DP... which has no clear advantage over DVI but potential problem across seen in the forum.

While many newer monitor come without DVI as well.

My company has 2415, 2412M, both are not glossy.
In company environment, glossy is suitable.

2415 is a pretty decent monitor,
while 2412m colour has no issue, but its white appear to be a bit "yellowish" no matter how we calibrated it (RGB level setting).

The cool tone look like IPS glow to me, but the yellow one seems like more a backlight bleed.

IPS glow - it changes when look from different angle. From the picture, it doesn't seems severe.
Bleed, same throughout no matter how you look at it.

IPS tends to have so called IPS glow, it is the nature of the panel, just more and less.

But, from experience buying a number of monitor (all IPS based due to better colour and viewing angle for office usage), I find that those more expensive IPS panel have less of it.

I find that IPS glow tend to happen more often in monitor instead of LCD TV, may be cheaper panel used in monitor?
I have a H-IPS LCD TV years ago, no glow, no bleed at all.

Since manufacturers change the blacklight from CCFL to LED, I also find the blacklight bleeding start more common at corner/edge of monitor.
I find LED light is not as good as CCFL, even for ordinary room lighting.
LED light always seems "odd" to me, not that natural.

I find it is a "pain" to buy a LCD monitor nowadays.

Unlike in the old day using CRT time, we don't need to worry about
1. Dead pixel
2. Colour accuracy
3. Glow (For IPS)
4. Bleeding.
5. Tinting problem.
6. Black problem.
7. Viewing angle (for TN)

There is always some luck element in getting a "perfect" LCD monitor.

While in the old day, 99.9% time you can get a "perfect" CRT monitor.

My office has one, picture is ok, but colour wise a bit "yellow" (for white background) even though I tried to calibrate it many time.
As compared another monitor (that recent bought), U2415's colour and crisp is way better than 2412m, but price tag also different a lot.

For general use, if not picky, I would say U2412m is ok.
But if picky (as mentioned not satisfy with 2414h, (which I don't know the reason), better go for premium panel.

I realised when the u2415 being delivered time as compared to U2412m, what you pay, what you get.
U2415 vs u2412m, price difference is about RM400+.