Linux & 21:9 = pain

[Jack.EXE]

# cvt 2560 1080 60
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
# xrandr --newmode "2560x1080_60.00"  230.00  2560 2720 2992 3424  1080 1083 1093 1120 -hsync +vsync
# xrandr --addmode DFP5 2560x1080_60.00
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  141 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  57
  Current serial number in output stream:  58

What am I doing wrong here?

I'm trying to enable my 21:9 monitor into actually being 21:9...

[Electronics Wizardy]

Distrol, gpu, driver?

 

[Jack.EXE]

45 minutes ago, Electronics Wizardy said:

Distrol, gpu, driver?

 

Debian, HD 7870XT, 15.2

[Electronics Wizardy]

4 hours ago, Jack.EXE said:

Debian, HD 7870XT, 15.2

try using the amd catalyst control center. Unless your using radeon drivers, the amdcccle is the best

 

[Jack.EXE]

Alright, so I fixed my problem, and I'm going to be a good Samaritan and tell y'all what I did.

 

So, turns out that while dual link dvi supports about 330 MHz on the pixel clock, HDMI only supports 165 (single link). Xrandr noticed this and thew out that error. 

 

The solution? Find the highest res your monitor will support that's under a clock of 165 MHz. I am currently running it at 2120x908