I'm trying to use
xrandr to add a custom resolution for my 2560x1080 AOC monitor.
I've been given the VESA timings by the manufacturer (attached), but I'm not sure what I should be doing with them:
I'm using cvt to generate a ModeLine (cvt 2560 1080 60.00), which generates:
# 2560x1080 59.98 Hz (CVT) hsync: 67.17 kHz; pclk: 230.00 MHz #Modeline "2560x1080_60.00" 230.00 2560 2720 2992 3424 1080 1083 1093 1120 -hsync +vsync
I can use
xrandr to add that Modeline, then add it to HDMI1 - but when I set the monitor to the new resolution, all I'm getting from the monitor is flashing colours, until I drop it back to firstname.lastname@example.org.
The laptop I'm using is an Acer Aspire v7-581PG - which has a 720M chip, so using Optimus (I also have bumblebee installed), but it seems that anything being output over HDMI uses the Intel chip anyway (which I believe is a 4400 chipset from the i5)
If I go into nvidia-settings with:
# optirun nvidia-settings -c :8,
I get to the settings menu, but no monitors are displayed there - so I assume everything's being handled by the Intel chip?).
I know the chipset CAN handle HDMI @ 2560x1080, as Windows 8 had no troubles outputting properly.
I assume I'm doing something wrong with the timings here, but I just can't work out what. I've tried dropping the refresh rate down in decrements of 1, all the way down to 40, but I get the same result - once I get down to 47.00, it just shows a black screen, rather than flashing colours.
Any help would be hugely appreciated. Having a 21:9 monitor running at 1920x1080 is annoying enough to make me consider switching back to windows!
Just to follow up, looking at the VESA timings, the nominal frequency is 181.250, so I have tried the following but get the same issue:
#Modeline "2560x1080_60.00" 230.00 2560 2720 2992 3424 1080 1083 1093 1120 -hsync +vsync