I have a Samsung SyncMaster 932BW monitor, and I've been having trouble to get it to work with it's highest resolution. According to the manual, the max resolution is 1440x900. The refresh rate can be as high as 75, though the manual says 60 is optimal. I tried messing with xrandr, to no avail. I settled for a while with 1024x768 on a VGA cable.
But then I got a DVI cable, hoping it would magically bring a solution. It did not. In fact, I was thrown back at a shitty 800x600, lol! It's a DVI-D single link cable. My graphics card (a GeForce 8400 GS) seems to support DVI-I, but my monitor only supports DVI-D anyways. I'm using the nvidia-current-updates proprietary driver.
Now here's what happens when I try to add a resolution using xrandr. First, if I type xrandr:
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bozodel@mint ~ $ xrandr
Screen 0: minimum 8 x 8, current 800 x 600, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 800x600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
800x600 60.3*+
HDMI-0 disconnected (normal left inverted right x axis y axis)
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bozodel@mint ~ $ cvt 1440 900 60
# 1440x900 59.89 Hz (CVT 1.30MA) hsync: 55.93 kHz; pclk: 106.50 MHz
Modeline "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
bozodel@mint ~ $ xrandr --newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync
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bozodel@mint ~ $ xrandr
Screen 0: minimum 8 x 8, current 800 x 600, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 800x600+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
800x600 60.3*+
HDMI-0 disconnected (normal left inverted right x axis y axis)
1440x900_60.00 (0x27d) 106.5MHz
h: width 1440 start 1528 end 1672 total 1904 skew 0 clock 55.9KHz
v: height 900 start 903 end 909 total 934 clock 59.9Hz
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bozodel@mint ~ $ xrandr --addmode DVI-I-1 1440x900_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: 29
Current serial number in output stream: 30