As far as I remember the older 1440p144 IPS 27" were DP1.2, such as PG279Q, XF270HUA, ...
These latest ones, I didn't have, it's possible they have finally upgraded the electronics since they also added HDR support and 10bit = 8bit+FRC.
TFTC states 27GL850 is DP1.4 but AD27QD is DP1.2a.
The latest I had 32GK850G is also DP1.2 and only HDMI1.4 because Gsync nerf. The HG70 Samsung were DP1.4.
It's not universal that all have DP1.4. Some do, some don't.
Laptop display, no luck over here, any refresh looks same as default 60, whether I raise it or lower, I can set the resolution+refresh fine, no errors, screen blinks as it changes but it's running the same old refresh in reality.
At least this OS works fairly OK, Win10 install crashes during it's loading with some major BSOD error that points nowhere, some major thing goes bust every single time I tried, too old laptop for Win10 to even load it's installer properly, probably doesn't know what to do with that mobile Nvidia GPU that even Nvidia only supports "on paper" more than in reality, I don't remember them ever in a decade of it's existence (and almost use too) releasing a bug free driver for it.
Just had to try