display problem through hdmi to tv

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Hello,
I have a Dell laptop, XPS M1330.
I had this problem with f12 originally but didn't go deeper with it.
Now I have updated the same system to f13 and experiment the same.
It has an hdmi-out connector and I'm trying to correctly configure it to send audio/video to hdmi only.
The connection is to a Panasonic 37" TV.
Audio is ok.
For video, after reading the tv specs I set these relevant parts in xorg.conf

Section "ServerLayout"
        Identifier     "Default Layout"
        Screen      0  "Screen0" 0 0
        InputDevice    "Keyboard0" "CoreKeyboard"
        InputDevice    "Mouse0" "CorePointer"
        Option      "Xinerama" "0"
EndSection

Section "Monitor"
        Identifier   "Monitor1"
        VendorName   "Panasonic"
        ModelName    "TX-L37G10E"
        HorizSync    31.0 - 69.0
        VertRefresh  59.0 - 86.0
EndSection

Section "Device"
        Identifier  "Device0"
        Driver      "nvidia"
        VendorName  "NVIDIA Corporation"
        BoardName   "GeForce 8400M GS"
        Option      "NoLogo" "True"
        Option      "ConnectedMonitor" "DFP-1"
        Option      "AddARGBGLXVisuals" "True"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Device0"
        Monitor    "Monitor1"
        DefaultDepth     24
        Option      "UseDisplayDevice" "DFP-1"
        SubSection "Display"
                Depth     24
                Modes     "1920x1080"
                ViewPort     0 0
        EndSubSection
EndSection

Section "Extensions"
        Option      "Composite" "Enable"
EndSection

It works and sends audio/video only to the tv, while the laptop display remains black, but it seems that upper and lower rows of the screen are not shown...
For example I don't see the top and bottom main bars.

xdpyinfo shows:
screen #0:
  dimensions:    1920x1080 pixels (650x366 millimeters)
  resolution:    75x75 dots per inch
  depths (7):    24, 1, 4, 8, 15, 16, 32
  root window id:    0x15a
  depth of root window:    24 planes

so it seems correct
Xorg.0.log shows these warning lines:
[   263.422] (WW) NVIDIA(0): Panasonic-TV (DFP-1)'s EDID does not contain a maximum image
[   263.422] (WW) NVIDIA(0):     size; cannot compute DPI from Panasonic-TV (DFP-1)'s
[   263.422] (WW) NVIDIA(0):     EDID.

And this EE line:
[   263.646] (EE) No input driver/identifier specified (ignoring)

And immediately above
[   261.716] (**) NVIDIA(0): Depth 24, (--) framebuffer bpp 32
[   261.716] (==) NVIDIA(0): RGB weight 888
[   261.716] (==) NVIDIA(0): Default visual is TrueColor
[   261.716] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[   261.716] (**) NVIDIA(0): Option "NoLogo" "True"
[   261.716] (**) NVIDIA(0): Option "ConnectedMonitor" "DFP-1"
[   261.716] (**) NVIDIA(0): Option "UseDisplayDevice" "DFP-1"
[   261.716] (**) NVIDIA(0): Option "AddARGBGLXVisuals" "True"
[   261.716] (**) NVIDIA(0): Enabling RENDER acceleration
[   261.716] (**) NVIDIA(0): ConnectedMonitor string: "DFP-1"
[   261.716] (II) NVIDIA(0): Support for GLX with the Damage and Composite X extensions is
[   261.716] (II) NVIDIA(0):     enabled.
[   262.330] (II) NVIDIA(0): NVIDIA GPU GeForce 8400M GS (G86M) at PCI:1:0:0 (GPU-0)
[   262.330] (--) NVIDIA(0): Memory: 262144 kBytes
[   262.330] (--) NVIDIA(0): VideoBIOS: 60.86.45.00.40
[   262.330] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[   262.330] (--) NVIDIA(0): Interlaced video modes are supported on this GPU
[   262.330] (--) NVIDIA(0): Connected display device(s) on GeForce 8400M GS at PCI:1:0:0:
[   262.330] (--) NVIDIA(0):     Panasonic-TV (DFP-1)
[   262.330] (--) NVIDIA(0): Panasonic-TV (DFP-1): 165.0 MHz maximum pixel clock
[   262.330] (--) NVIDIA(0): Panasonic-TV (DFP-1): Internal Single Link TMDS
[   262.397] (II) NVIDIA(0): Assigned Display Device: DFP-1
[   262.397] (II) NVIDIA(0): Validated modes:
[   262.397] (II) NVIDIA(0):     "1920x1080"
[   262.397] (II) NVIDIA(0): Virtual screen size determined to be 1920 x 1080

And below

[   263.422] (==) NVIDIA(0): DPI set to (75, 75); computed from built-in default
[   263.422] (**) NVIDIA(0): Enabling 32-bit ARGB GLX visuals.
[   263.422] (--) Depth 24 pixmap format is 32 bpp
[   263.422] (II) NVIDIA: Using 768.00 MB of virtual memory for indirect memory access.
[   263.423] (II) NVIDIA(0): Initialized GPU GART.
[   263.430] (II) NVIDIA(0): ACPI display change hotkey events enabled: the X server is new
[   263.430] (II) NVIDIA(0):     enough to receive ACPI hotkey events.
[   263.431] (II) NVIDIA(0): ACPI brightness change hotkey events enabled.
[   263.436] (II) NVIDIA(0): Setting mode "1920x1080"
[   263.464] (II) Loading extension NV-GLX
[   263.495] (II) NVIDIA(0): Initialized OpenGL Acceleration
[   263.529] (==) NVIDIA(0): Disabling shared memory pixmaps
[   263.529] (II) NVIDIA(0): Initialized X Rendering Acceleration
[   263.529] (==) NVIDIA(0): Backing store disabled
[   263.529] (==) NVIDIA(0): Silken mouse enabled
[   263.539] (==) NVIDIA(0): DPMS enabled
[   263.539] (II) Loading extension NV-CONTROL
[   263.539] (II) Loading extension XINERAMA
[   263.539] (II) Loading sub module "dri2"
[   263.539] (II) LoadModule: "dri2"
[   263.540] (II) Reloading /usr/lib64/xorg/modules/extensions/libdri2.so
[   263.540] (II) NVIDIA(0): [DRI2] Setup complete
[   263.540] (II) NVIDIA(0): [DRI2]   VDPAU driver: nvidia
[   263.540] (==) RandR enabled

I know that I'm using proprietary nvidia module and the question would be somehow offtopic, but probably it is not related (only) to the driver..
Anyway I could also try to use nouveau driver and see if the problem arises with it too...
In the mean time any suggestion?

When X Windows System starts, the tv shows the label

WIDE
1080p

So it seems it accepts the 1920x1080 resolution.
BTW: on laptop
cat /proc/cmdline shows:
ro root=UUID=f829ca09-552e-46ce-85bd-779da1c90d17 rd_NO_LUKS rd_NO_LVM rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYTABLE=us rhgb quiet rdblacklist=nouveau nomodeset elevator=deadline /dev/sda6

Thanks in advance,
Gianluca

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