adding new resolution in multi monitor setup via xrandr

Question

I have two monitors with different max. resolutions (2560x1440 and 1920x1080). In windows I am able to configure the max resolution for both monitors but in linux (manjaro, proprietary nvidia drivers and xrandr 1.5) is the resolution of the bigger one limited to 2048x1152. I read several questions/threads/articles how to add custom resolution via xrandr but none of these work for me. Here is my problem:

Output of xrandr:

Screen 0: minimum 8 x 8, current 3968 x 1152, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DVI-I-2 connected 1920x1080+2048+0 (normal left inverted right x axis y axis) 478mm x 269mm
   1920x1080     60.00*+
   ... skipped few lines .... 
   640x480       75.00    72.81    59.94  
HDMI-0 connected primary 2048x1152+0+0 (normal left inverted right x axis y axis) 553mm x 311mm
   2048x1152     60.00*+
   ... skipped few lines ...                                                                              
   640x480       75.00    59.94    59.93                                                                      
DVI-I-3 disconnected (normal left inverted right x axis y axis)

I generate new custom resolution with cvt:

$ cvt 2560 1440 60
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync

Now I want to create new resulution:

xrandr --newmode 2560x1440_60.00 312.25  2560 2752 3024 3488  1440 1443 1448 1493 -hsync +vsync

Output of xrandr looks now like this:

Screen 0: minimum 8 x 8, current 3968 x 1152, maximum 16384 x 16384                                           
DVI-I-0 disconnected (normal left inverted right x axis y axis)                                               
DVI-I-1 disconnected (normal left inverted right x axis y axis)                                               
DVI-I-2 connected 1920x1080+2048+0 (normal left inverted right x axis y axis) 478mm x 269mm                   
   1920x1080     60.00*+                                                                                      
   ... skipped few lines ...                                                             
   640x480       75.00    72.81    59.94                                                                      
HDMI-0 connected primary 2048x1152+0+0 (normal left inverted right x axis y axis) 553mm x 311mm               
   2048x1152     60.00*+                                                                                      
   ... skipped few lines ...  
   640x480       75.00    59.94    59.93  
DVI-I-3 disconnected (normal left inverted right x axis y axis)
  2560x1440_60.00 (0x313) 312.250MHz -HSync +VSync
        h: width  2560 start 2752 end 3024 total 3488 skew    0 clock  89.52KHz
        v: height 1440 start 1443 end 1448 total 1493           clock  59.96Hz

If I want now to add this resolution to output HDMI-0 I get following error:

$ xrandr --addmode HDMI-0 2560x1440_60.00
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  33
  Current serial number in output stream:  34

In the past I was able successfully use this method to setup my monitors as needed without any problem on different pc (notebook + ext. monitor, both with the same resolution). I would really appreciate any suggestions.