WTware Technical Support

The following lines in /boot/config.txt worked to get a single 2560 x 1440 display working at 50hz:

# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=88
hdmi_cvt=2560 1440 50 3 0 0

hdmi_group=2
hdmi_mode=87
max_framebuffer_width=2560
max_framebuffer_height=1440
hdmi_pixel_freq_limit=250000000
hdmi_cvt=2560 1440 56 5 0 0 1
hdmi_ignore_edid=0xa5000080

Please try:

https://forums.raspberrypi.com/viewtopic.php?t=280976

[code]The following lines in /boot/config.txt worked to get a single 2560 x 1440 display working at 50hz:

# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=88
hdmi_cvt=2560 1440 50 3 0 0[/code]

Or another solution:

https://forums.raspberrypi.com/viewtopic.php?p=1492120#p1492120

[code]hdmi_group=2
hdmi_mode=87
max_framebuffer_width=2560
max_framebuffer_height=1440
hdmi_pixel_freq_limit=250000000
hdmi_cvt=2560 1440 56 5 0 0 1
hdmi_ignore_edid=0xa5000080[/code]

we want to buy 2K or 4k monitors, but in the "Raspberry firmware config.txt" you can only set a maximum resolution of 1920x1200.

We currently need a resolution of 2560x1440 on only one display, the second display HDMI port is not used.

Later then a resolution of 3840 x 2160

We use Raspberry Pi 4 versions