Custom Resolution Utility (CRU)

[joevt]

(04-15-2020 12:05 AM)68k-dude Wrote:  The limit seems to be taken from the monitor itself. The EPROM data on it is being read by the driver. I can see model info, serial number, and some other attributes. Why there is a 180MHz limit in there I don't know.

I may try to prevent the driver from reading the data. Cut the PIN or put something on it to prevent the data from being read. I wonder if I could spoof it by putting an EPROM inside the DP to VGA adaptor. Hmmm, that would be a fun little job.

I doubt the issue is with the display (unless you've examined the EDID - you can post a copy here of the hex or binary)?

Which DP to VGA adapter are you using? There are many that can do up to 330 or 360 MHz even if they advertise only 1920x1200 60Hz.
https://hardforum.com/threads/24-widescr...1044556918

If you connect the adapter to a Mac and do the AGDCDiagnose command, you can find out what the max DisplayPort link rate and lanes is (info from the DPCD registers). I don't know if there's a Linux or Windows utility to get that info. 180 MHz (assuming 8 bpc) is the limit for 1 lane of HBR2 or 2 lanes of HBR. The Plugable.com USBC-VGA adapter uses 2 lanes of HBR2 which should support 360 MHz but tops out at about 330 MHz for me (product page says it supports 1920x1200@60Hz which is only 193 MHz, assuming GTF timing).