27" iMac doesn't have correct resolution for LG monitor

Question

Hi guys,
Hoping to find some answers here - I called Apple Care but they weren't very helpful and told me to call LG..but I really doubt the issue has anything to do with LG.
I have a 22" LG monitor that I used as a second monitor for my 24" imac. It worked great, no problems. I recently got a 27" imac and the display options don't give me the correct resolution for the second monitor (needs 1900x1080). So I can only use it at a totally blown up, out of proportion res. If I try to set it at any of the higher resolution options the monitor goes black and says "out of range".
To me, this is a problem with the iMac, not the monitor, as it doesn't seem to support the proper resolution. Am I screwed and just can't use this monitor with the new iMac?

Answer 1

ichbinesderelch wrote:have you tried using xrandr? xrandr -q shows available outputs, xrandr --output outputadapter(like VGA) --mode 1280x1024, as far as i can see, virtual monitor is set high enough that this should kinda work!
Yes, I tried xrandr:
$ xrandr --newmode "1280x1024" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync
$ xrandr --addmode VGA 1280x1024
$ xrandr --output VGA --mode 1280x1024
$ xrandr --output VGA --right-of LVDS
At first this didn't work at all, so I tried to mess with screen resolution applet and got output on the second monitor, but not at the desired resolution.
I tried running these commands again and got output on the second monitor, but at the wrong resolution. The strange part is that the resolution I want is listed by xrandr:
$ xrandr -q
Screen 0: minimum 320 x 200, current 2304 x 800, maximum 2560 x 2048
VGA connected 1024x768+1280+0 (normal left inverted right x axis y axis) 0mm x 0mm
1280x800@60 60.0 +
1360x768 59.8
1024x768 60.0*
800x600 60.3 56.2
640x480 59.9
1280x1024 60.0
LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1280x800 60.0*+
1024x768 85.0 75.0 70.1 60.0
832x624 74.6
800x600 85.1 72.2 75.0 60.3 56.2
640x480 85.0 72.8 75.0 59.9
720x400 85.0
640x400 85.1
640x350 85.1
TV disconnected (normal left inverted right x axis y axis)