On Wed, May 31, 2017 at 2:06 PM, Allan Streib <astreib@indiana.edu> wrote:
> I think you should try another monitor if at all possible. Perhaps your
> monitor just goes into power-save mode with an incompatible signal.
If and when I get my hands on another monitor I'll definitely try it
out. (Although ultimately it would be nice to get it working with this
one, as it works fine under Linux. This is a Dell U2515H.)
> My xrandr shows the 2560x1440 mode at 59.95Hz, I'm assuming that's close
> enough to 60Hz that it should work? Or could that be the problem? The
> highest I can get working is 2048x1152.
>
> Screen 0: minimum 320 x 200, current 4096 x 1152, maximum 8192 x 8192
> DVI-0 connected primary 2048x1152+0+0 (normal left inverted right x axis y axis) 553mm x 311mm
> 2560x1440 59.95 +
> 2048x1152 60.00*
> 1920x1200 59.95
> [...]
You may be able to get a higher resolution by decreasing the refresh rate:
$ gtf 2560 1440 33
# 2560x1440 @ 33.00 Hz (GTF) hsync: 48.44 kHz; pclk: 162.77 MHz
Modeline "2560x1440_33.00" 162.77 2560 2688 2960 3360 1440 1441
1444 1468 -HSync +Vsync
$ xrandr --newmode 2560x1440_33.00 162.77 2560 2688 2960 3360 1440
1441 1444 1468 -HSync +Vsync
$ xrandr --addmode DVI-0 2560x1440_33.00
$ xrandr --output DVI-0 --mode 2560x1440_33.00
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