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My machine is an Apple Macbook Air 1,1 from Early 2008, and I'm running Ubuntu 12.04 with kernel Linux 3.2.0-58-generic-pae.

When I connect it to an HD TV via the minidisplayport-DVI (Apple adapter) --> DVI-HDMI (cable) I get the TV recognized in System Settings -> Displays, but the TV only gets a completely black screen signal (i.e. it gets a signal, because if I unplug the cable or disable the TV screen in Ubuntu the TV then says 'no signal', but this signal is just black screen).

The TV is Philips 32pfl4007m/08 but in system settings -> displays it gets named ''philips consumer electronics 58''

The output from xrandr (with cable plugged in) is

Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 8192 x 8192
LVDS1 connected 1280x800+0+12 (normal left inverted right x axis y axis) 286mm x 179mm
   1280x800       61.2*+
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1920x1080+1280+0 (normal left inverted right x axis y axis) 1280mm x 720mm
   1920x1080      60.0*+   50.0     24.0  
   1600x1200      60.0  
   1280x1024      60.0  
   1360x768       59.8  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0  
TV1 unknown connection (normal left inverted right x axis y axis)
   848x480        59.9 +
   640x480        59.9 +
   1024x768       59.9  
   800x600        59.9

Am I missing some configuration in Ubuntu? or is that a driver problem for the TV or the Apple adapter? Could it be related to Compiz or nvidia drivers?

From Apple page I read

Graphics and video support Intel GMA X3100 graphics processor with 144MB of DDR2 SDRAM shared with main memory

Extended desktop and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 1920 by 1200 pixels on an external display, both at millions of colors

Mini-DVI port

Regarding nvidia drivers since I get

cat /proc/driver/nvidia/version
No such file or directory

I believe I'm not using any nvidia drivers.

With lspci I get

Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller

also

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 03) (prog-if 00 [VGA controller])
    Subsystem: Apple Inc. Device 00a2
    Flags: bus master, fast devsel, latency 0, IRQ 42
    Memory at 90000000 (64-bit, non-prefetchable) [size=1M]
    Memory at 80000000 (64-bit, prefetchable) [size=256M]
    I/O ports at 5110 [size=8]
    Expansion ROM at <unassigned> [disabled]
    Capabilities: <access denied>
    Kernel driver in use: i915
    Kernel modules: intelfb, i915

00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (secondary) (rev 03)
    Subsystem: Apple Inc. Device 00a2
    Flags: bus master, fast devsel, latency 0
    Memory at 90100000 (64-bit, non-prefetchable) [size=1M]
    Capabilities: <access denied>

and

xxx@xxx:~$ sudo lshw -C display
  *-display:0             
       description: VGA compatible controller
       product: Mobile GM965/GL960 Integrated Graphics Controller (primary)
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 03
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:42 memory:90000000-900fffff memory:80000000-8fffffff ioport:5110(size=8)
  *-display:1 UNCLAIMED
       description: Display controller
       product: Mobile GM965/GL960 Integrated Graphics Controller (secondary)
       vendor: Intel Corporation
       physical id: 2.1
       bus info: pci@0000:00:02.1
       version: 03
       width: 64 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: latency=0
       resources: memory:90100000-901fffff
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