Z230 with Firepro w2100 reverts to low resolution when the monitor is removed.

Question

Hi all,Just wondering if anyone has a workaround for an issue I've found.I'm using a HP Z230 workstation that has an AMD Firepro w2100 in it. We're intending on running this machine headless and only accessing it remotely if we need to at all, however, as soon as the monitor (a HP p221 connected via a Dell DVI > Displayport adapter) is removed, and the machine is accessed remotely, it reverts back to 640x480 and becomes largely unusable for the purpose... I've read up on this a little and found that apparently it's part of the DP specification where it polls for a connected display, and if nothing is connected it will revert back for compatibility reasons, so I'm wondering if anyone knows of a way to perhaps give the machine a "virtual" display or something akin to daemontools showing the machine there's virtual DVD/CD drive to mount an image with. Hopefully someone has seen this issue and found a way around it  Many thanks.

Answer 1

Thanks for the reply.  I tried following those commands, with the following result:
➜  ~  cvt 1920 1080
# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
➜  ~  sudo xrandr --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
➜  ~  sudo xrandr --addmode DVI-D-0 1920x1080_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:  43
  Current serial number in output stream:  44
Also, this is the output when running xrandr if it provides any additional information:
➜  ~  xrandr
Screen 0: minimum 8 x 8, current 2720 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
   1920x1080     60.00*+
   1680x1050     59.95 
   1440x900      59.89 
   1280x1024     60.02 
   1280x800      59.81 
   1152x864      75.00 
   1024x768      70.07    60.00 
   800x600       60.32    56.25 
   640x480       59.94 
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 connected 800x600+1920+0 (normal left inverted right x axis y axis) 0mm x 0mm
   800x600       60.32*+
Unknown-0 disconnected (normal left inverted right x axis y axis)
  1920x1080_60.00 (0x1ea) 173.000MHz
        h: width  1920 start 2048 end 2248 total 2576 skew    0 clock  67.16KHz
        v: height 1080 start 1083 end 1088 total 1120           clock  59.96Hz