VGA port doesn't give video signal.

Hi friends
I have Kubuntu and Archlinux in my laptop. I've a monitor samsung with 1280x1024 of resolution. In ubuntu the monitor work fine but in arch.
xrandr command give the following output with the monitor plug in or not:
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1366 x 768, current 1366 x 768, maximum 1368 x 768
default connected 1366x768+0+0 0mm x 0mm
1366x768 0.0*
1368x768 0.0
my lspci command give me this output:
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM76 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
01:00.0 Ethernet controller: Qualcomm Atheros AR8162 Fast Ethernet (rev 10)
02:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)
Googling the problem and looking into the arch forum I've found this https://wiki.archlinux.org/index.php/Poulsbo but I don't know if my card is compatible with this post...
Friends, someone of you had have this problem before or know how fix it???
anyway
thanks to everybody

This may sound silly, but it's come up before. Try the function keys built into the laptop keyboard. If you get nothing, try pressing it again as sometimes there are three or four modes they toggle through, but one of them may activate the second monitor.
Aside from that it does appear that the configuration is set to the wrong resolution, but it could also just be a default guess and it couldn't figure out one that works. Check xrandr settings. I don't use this, so I'm not sure where they would be.
This may help find default system configuration files:
find /etc/ -iname "*xrandr*"

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