Backup your xorg.conf:
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$ sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
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$ sudo cp /etc/X11/xorg.conf.backup /etc/X11/xorg.conf
Let's try this. Change the respective xorg.conf lines to (if you have just ONE monitor, let Xorg auto detect it)
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#[sisctrl] Set CRT1 device type
#Option "ForceCRT1Type" "VGA" #monitor on
#Option "ForceCRT1Type" "NONE" #monitor off
#[sisctrl] Set CRT2 device type
#Option "ForceCRT2Type" "NONE" #notebook off
#Option "ForceCRT2Type" "LCD" #notebook on
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SubSection "Display"
Viewport 0 0
Depth 24
Virtual 1024 768
Modes "1280x1024" "1280x800" "1024x768" "800x600" "640x480"
EndSubSection
----------------------------
EDIT 1:
Are you using sisctrl control panel to change the resolution of monitor? Just the Lubuntu menu won't work. You need to use the Sis Control.
Open a terminal and run
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$ sisctrl
EDIT 2:
OK, I didn't post the How-To for the sisctrl control panel. Sorry. I'll make it to share in the forum later.