This is my first post here, not in a linux-based forum. So hopefully, I know most of the ropes.
I daily drive a NEC FP1355 CRT monitor. While I often play games at 1024 x 768 @144hz or 640 x 480 @160hz, I find 1600 x 1200 the most comfortable for web browsing on this specific monitor. To avoid headaches, I try to get it at the highest refresh my monitor supports on 1600 x 1200, which is 95hz.
I create the timings:
dotmatrixinspiron-3880% cvt12 1600 1200 95
# 1600x1200 @ 95.000 Hz (CVT) field rate 94.923 Hz; hsync: 120.552 kHz; pclk: 264.25 MHz
Modeline "1600x1200_95.00" 264.25 1600 1728 1896 2192 1200 1203 1207 1270 -hsync +vsync
Then, I create the mode via xrandr:
dotmatrixinspiron-3880% xrandr --newmode "1600x1200_95.00" 264.25 1600 1728 1896 2192 1200 1203 1207 1270 -hsync +vsync
Add it to my monitor (VGA is DP3):
dotmatrixinspiron-3880% xrandr --addmode DP3 "1600x1200_95.00"
And then attempt to display it:
dotmatrixinspiron-3880% xrandr --output DP3 --mode "1600x1200_95.00"
But whenever I do, I get the infamous message:
xrandr: Configure crtc 0 failed
I noticed that by using reduced timings…
dotmatrixinspiron-3880% cvt12 1600 1200 95 --force-rb
WARNING: Refresh rate must be multiple of 60hz according to CVT 1.1 specifications for reduced blanking.
WARNING: Forcing calculations might give incorrect results. Use at your own risk.
# 1600x1200 @ 95.000 Hz Reduced Blank (CVT) field rate 94.961 Hz; hsync: 119.176 kHz; pclk: 209.75 MHz
Modeline "1600x1200_95.00_rb1" 209.75 1600 1648 1680 1760 1200 1203 1207 1255 +hsync -vsync
dotmatrixinspiron-3880% xrandr --newmode "1600x1200_95.00_rb1" 209.75 1600 1648 1680 1760 1200 1203 1207 1255 +hsync -vsync
dotmatrixinspiron-3880% xrandr --addmode DP3 "1600x1200_95.00_rb1"
dotmatrixinspiron-3880% xrandr --output DP3 --mode "1600x1200_95.00_rb1"
It does work, but with terrible overscan. Of course, this may be because of using a CRT monitor. It requires time to blank to the next line.
I’ve also tried outputting via crtc number, but to no avail. This is frustrating, as I’ve even took the time to research about CVT timings… which took me no where. If anyone had a similar problem with a solution, let me know.