Native resolution 2560*1440p not available

[zakzhang]

Hello，

I just bought a new 23.8 inch LCD display (pnp ID: AMT2380), with native resolution 2560*1440p 60Hz and one VGA, one display port and one HDMI slot.

The strange thing is that on my windows 10 desktop PC with a Nvidia GeForce 405 card (512M memory, VGA and HDMI slot), it can only use 1980*1080p as the highest resolution with HDMI connection (VGA connection even lower).

I replaced the Nvidia card with an AMD ATI 7670 on the windows 10 desktop PC, it still worked on 1980*1080p.

I connected this LCD display to my macbook pro with HDMI line, it worked on native resolution perfectly.

I connected it to another windows laptop with HDMI line, it also worked on native resolution well.

I checked EDID of this LCD display, and got "Native/preferred timing.. 2560x1440p at 60Hz (16:9)".

I tried CRU 1.4.1，the application showed resolution 2560*1440p available, but it didn't work after restart display card.

Can anyone give me a clue on this? Thanks a lot.

p.s. I attached the exported EDID data file in this thread for reference.

[ToastyX]

Both of those cards are old and not even supported by the current drivers. It's possible they don't support an HDMI version new enough for 2560x1440 @ 60 Hz. Have you tried the pixel clock patcher? https://www.monitortests.com/forum/Threa...ck-Patcher

[zakzhang]

(03-22-2019 06:10 PM)ToastyX Wrote:  Both of those cards are old and not even supported by the current drivers. It's possible they don't support an HDMI version new enough for 2560x1440 @ 60 Hz. Have you tried the pixel clock patcher? https://www.monitortests.com/forum/Threa...ck-Patcher

Hi, ToastyX

I tried the pixel clock patch according to your comment and problem solved!
Thank you so much!

Jimmy