I think you want the reduced blanking modeline:
$ cvt -r 2560 1440
# 2560x1440 59.95 Hz (CVT 3.69M9-R) hsync: 88.79 kHz; pclk: 241.50 MHz
Modeline "2560x1440R" 241.50 2560 2608 2640 2720 1440 1443 1448
1481 +hsync -vsync
This matches your monitor's detailed timings:
[55.220] (II) NOUVEAU(0): Supported detailed timing:
[55.220] (II) NOUVEAU(0): clock: 241.5 MHz Image Size: 597 x 336 mm
[55.220] (II) NOUVEAU(0): h_active: 2560 h_sync: 2608 h_sync_end
2640 h_blank_end 2720 h_border: 0
[55.220] (II) NOUVEAU(0): v_active: 1440 v_sync: 1443 v_sync_end
1448 v_blanking: 1481 v_border: 0
Not sure why a 2560x1440 modeline isn't being advertised in EDID -
perhaps the monitor is in some "safe" setting where that's not
reported? Might have to flip it into DP 1.2 mode or something.
On Wed, Sep 21, 2016 at 10:09 AM, Roger Price wrote:
> Hi, Distribution: openSUSE 42.2 Beta, Kernel: 4.4. The box is a Dell
> Precision T7500 with an nVidia Quadro 4000 card and a displayport connected
> iiyama B2783QSU 2560x1440 monitor identified as DP-1.
>
> Problem: The monitor is detected as 1920x1080 and not 2560x1440. See Xorg
> log file at http://rogerprice.org/Xorg.0.log . There is no file
> /etc/X11/xorg.conf and in the directory /etc/X11/Xorg.conf.d/ the files
> 50-device.conf, 50-monitor.conf and 50-screen.conf contain comments only.
>
> My attempted repair failed:
>
> I used gtf to calculate a 2560x1440_60 mode line
>
> Modeline "2560x1440_60.00" 311.83 2560 2744 3024 3488 1440 1441 1444
> 1490 -HSync +Vsync
>
> and I then used commands
>
> xrandr --newmode 2560x1440 311.83 2560 2744 3024 3488 1440 1441 1444
> 1490 -HSync +Vsync
> xrandr --addmode DP-1 2560x1440
> xrandr --output DP-1 --mode 2560x1440
>
> The result is that windows on the screen seem to increase in size slightly
> and flow off the screen. The system tray normally at the bottom of the
> screen has disappeared. More precisely, command xrandr -q reports:
>
> Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
> DVI-I-1 disconnected (normal left inverted right x axis y axis)
> DP-1 connected 2560x1440+0+0 (normal left inverted right x axis y axis)
> 597mm x 336mm
> 1920x1200 59.95
> 1920x1080 60.00
> 1600x1200 60.00
> 1680x1050 59.88
> 1600x1000 60.01
> 1600x900 60.00
> 1280x1024 75.02
> 1440x900 59.90
> 1024x768 75.0360.00
> 800x600 75.0060.32
> 640x480 75.0059.94
> 2560x1440 60.00*
> DP-2 disconnected (normal left inverted right x axis y axis)
>
> but command xvidtune -show reports:
>
> "1920x1200" 154.00 1920 1968 2000 2080 1200 1203 1209 1235 +hsync
> -vsync
>
> I'm not sure if I'm looking at a bug or if this is just noob confusion. Any
> advice or suggestion would be much appreciated.
>
> Roger
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