1)this the output for lspci -v of the graphic card that shows that there is no kernel driver in use:
01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 630] (rev a1) (prog-if 00 [VGA controller])
Subsystem: ZOTAC International (MCO) Ltd. GF108 [GeForce GT 630]
Flags: bus master, fast devsel, latency 0, IRQ 10
Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
Memory at f0000000 (64-bit, prefetchable) [size=128M]
Memory at fa000000 (64-bit, prefetchable) [size=32M]
I/O ports at dc00 [size=128]
Expansion ROM at fe980000 [disabled] [size=512K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Endpoint, MSI 00
Capabilities: [b4] Vendor Specific Information: Len=14 <?>
Capabilities: [100] Virtual Channel
Capabilities: [128] Power Budgeting <?>
Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
I know that nvidia driver will solve the issue, but for one side I fear the nvidia driver installation will not be successful and make trouble for the system...I will try with the suggestions you gave, in fact there is a lot of discussion on google thanks
2)here some outputs of the link you sent me:
bash-4.3# cvt 1680 1050
# 1680x1050 59.95 Hz (CVT 1.76MA) hsync: 65.29 kHz; pclk: 146.25 MHz
Modeline "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync
bash-4.3#
bash-4.3# xrandr --newmode "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync
xrandr:
Failed to get size of gamma for output default