Can't get two Samsung SyncMaster 2343nw monitors to display 2048x1152 dual screen

[jonah1980]

Hi I have two 2343nw montors. One plugged in with DVI and the other with an adapter to VGA.

When I run xrandr I get this:

:~$ xrandr
Screen 0: minimum 8 x 8, current 3200 x 1152, maximum 16384 x 16384
DVI-I-0 connected 1152x864+2048+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.0 +
1360x768 60.0 59.8
1152x864 60.0*
800x600 72.2 60.3 56.2
680x384 60.0 59.8
640x480 59.9
512x384 60.0
400x300 72.2
320x240 60.1
VGA-0 connected primary 2048x1152+0+0 (normal left inverted right x axis y axis) 510mm x 287mm
2048x1152 59.9*+
1680x1050 60.0
1440x900 59.9
1280x1024 60.0
1280x960 60.0
1280x800 59.8
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-I-0 (0x2f1) 2048.0MHz
h: width 156 start 2048 end 2096 total 2128 skew 0 clock 962.4KHz
v: height 2208 start 1152 end 1155 total 1160 clock 829.7Hz
2048x1152_60.00-test (0x2f2) 156.8MHz
h: width 2048 start 2096 end 2128 total 2208 skew 0 clock 71.0KHz
v: height 1152 start 1155 end 1160 total 1185 clock 59.9Hz
1280x1024_60.00 (0x2fc) 109.0MHz
h: width 1280 start 1368 end 1496 total 1712 skew 0 clock 63.7KHz
v: height 1024 start 1027 end 1034 total 1063 clock 59.9Hz
newmode (0x2fd) 156.8MHz
h: width 2048 start 2096 end 2128 total 2208 skew 0 clock 71.0KHz
v: height 1152 start 1155 end 1160 total 1185 clock 59.9Hz
samsung (0x344) 156.8MHz
h: width 2048 start 2096 end 2128 total 2208 skew 0 clock 71.0KHz
v: height 1152 start 1155 end 1160 total 1185 clock 59.9Hz

--

Now I've tried making newmodes and addmode etc, which I think are what are showing up below but xrandr won't let me apply them and the GUI's such as arandr don't show them either.

Can anyone please help me get both monitors working?

Thanks for any help at all.

[oshunluvr]

This is usually a video card driver or xorg setup issue. What is your video system setup and what does /var/log/xorg.0.log say about it?

[oshunluvr]

Also, your newmode looks correct. Here's what I get:

sudo xrandr --newmode "2048x1152" 156.750 2048 2096 2128 2208 1152 1155 1160 1185 +hsync -vsync
sudo xrandr --addmode DVI-I-0 2048x1152
sudo xrandr --output DVI-I-0 --mode 2048x1152

This should work. Could just be a bad cable connection or bad EDID. One thing to test is to switch monitors to see if one of them has issues.

[jonah1980]

Hi I've switched the cables round but I still get the same issue. Changing them over though has turned DVI-0-0 into VGA-0

But I tried what you put above and got this:

jonah@Jonah-T5:~$ sudo xrandr --newmode "2048x1152" 156.750 2048 2096 2128 2208 1152 1155 1160 1185 +hsync -vsync
[sudo] password for jonah:
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 16 (RRCreateMode)
Serial number of failed request: 31
Current serial number in output stream: 31
jonah@Jonah-T5:~$ sudo xrandr --addmode VGA-0 2048x1152
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: 31
Current serial number in output stream: 32
jonah@Jonah-T5:~$ sudo xrandr --output VGA-0 --mode 2048x1152
xrandr: cannot find mode 2048x1152

[jonah1980]

Hi just to update that I've now fixed this by adding this to the xorg.conf:

ModeLine "2048x1152_60.00_rb" 156.750 2048 2096 2128 2208 1152 1155 1160 1185 +hsync -vsync