A flicker problem

[Piero Dalle Pezze]

Thanks sktsee, for your answer. I post what you asked me. 
On details, a strange fact occurs when I execute 

	sudo hwinfo --monitor

The screen was translated 1 cm to the right:
To better explain this, suppose a row in a screen of 10 pixel:
1234567890. After executing the command, I saw a screen shifted like
3456789012. I never have seen this phenomenon.

Moreover, the output of sudo hwinfo --monitor, tells:
Max. Resolution: 1024x768, even though the really max resolution is
1280x800. When the "blue flicker" problem appear, my monitor change
resolution from 1280x800 to 1024x768.

When I said "put the display to sleep", I was referring to
just the blank monitor that appear after the screen saver mode. So I was
meaning the swiching off the monitor, while the computer is running.
After having moved the mouse or pressed a button of the keyboard the
"blue flicker" problem appears.


sudo hwinfo --gfxcard

25: PCI 05.0: 0300 VGA compatible controller (VGA)              
  [Created at pci.296]
  UDI: /org/freedesktop/Hal/devices/pci_10de_244
  Unique ID: CvwD.8q7op5I_my2
  SysFS ID: /devices/pci0000:00/0000:00:05.0
  SysFS BusID: 0000:00:05.0
  Hardware Class: graphics card
  Model: "Hewlett-Packard Company GeForce Go 6150"
  Vendor: pci 0x10de "nVidia Corporation"
  Device: pci 0x0244 "GeForce Go 6150"
  SubVendor: pci 0x103c "Hewlett-Packard Company"
  SubDevice: pci 0x30bf 
  Revision: 0xa2
  Driver: "nvidia"
  Driver Modules: "nvidia"
  Memory Range: 0xc2000000-0xc2ffffff (rw,non-prefetchable)
  Memory Range: 0xd0000000-0xdfffffff (rw,prefetchable)
  Memory Range: 0xc1000000-0xc1ffffff (rw,non-prefetchable)
  Memory Range: 0x88000000-0x8801ffff (ro,prefetchable,disabled)
  IRQ: 10 (149615 events)
  I/O Ports: 0x3c0-0x3df (rw)
  Module Alias: "pci:v000010DEd00000244sv0000103Csd000030BFbc03sc00i00"
  Driver Info #0:
    XFree86 v4 Server Module: nv
  Config Status: cfg=new, avail=yes, need=no, active=unknown

Primary display adapter: #25



sudo hwinfo --monitor

35: None 00.0: 10000 Monitor                                    
  [Created at fb.71]
  Unique ID: rdCR.EY_qmtb9YY0
  Hardware Class: monitor
  Model: "Generic Monitor"
  Vendor: "Generic"
  Device: "Monitor"
  Resolution: 1024x768 at 76Hz
  Driver Info #0:
    Max. Resolution: 1024x768
    Vert. Sync Range: 50-90 Hz
    Hor. Sync Range: 31-61 kHz
  Config Status: cfg=new, avail=yes, need=no, active=unkno


Piero