Hi,
I have recently bought 2 BenQ EX2780Q, which are 2560 x 1440p screens with a refresh rate of 144Hz . I have connected them both to my graphic card, a Saphire Radeon R9 380x. One is connected through my displayport 1.2 and works flawlessly.
The other is connected through the HDMI port of my graphic card, which is I believe HDMI 1.4a, using the HDMI cable furnished with the screen. Sadly, this second screen is detected as a 3840 x 2160p display with a refresh rate between 29 to 40Hz (instead of 144Hz). The low refresh rate and the scaling issue makes the second screen nearly unusable.
I am very surprised by this problem and was wondering if someone here already encountered it and managed to fix it? I am very puzzled as to why my graphic card would think this screen is 4k. I understand that my HDMI port most likely cannot do 1440p at 144Hz but I would expect it to default to something like 1440p at 60Hz instead of what it is doing now.
