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I have just installed Ubuntu 14.04 64-bit on my Toshiba Portege R600-10Q laptop (a model from 2009). I am now trying to display the desktop on a BenQ Senseye3 22" monitor, via the vga output, but it's not working - the monitor says "No Signal Detected!".

What I've done:

  • I have gone into "Screen Display", where I can see the monitor is detected by the laptop.
  • The monitor has a 1920 x 1080 native resolution, which I have tried to use, but I have also set it to lower resolutions, e.g. 1024 x 576.
  • I have tried to use the monitor in dual screen, mirrored and single screen mode - none work.
  • I have tried pressing Fn + F5 to get single screen output - the laptop screen goes blank, but still no output on the monitor.
  • I have tried several monitors (of the same type, and also of a different make), so I don't think it's that.

If, and only if, the monitor was plugged in to the PC's vga output during boot up, then the display outputs to the monitor correctly. But if I plug the vga cable in after boot up, then the monitor receives no signal.

The laptop has the Intel® GS45 Express chipset for graphics acceleration. I installed mesa-utils and ran glxinfo in a terminal. Amongst the output was:

OpenGL renderer string: Mesa DRI Mobile Intel® GM45 Express Chipset

Also, in the "About This Computer" window I see:

Graphics: Mobile Intel® GM45 Express Chipset

I wonder if the problem is that my chipset is GS45 not GM45.

One last thing. The output of "sudo lshw -C video" is:

*-display:0
description: VGA compatible controller
product: Mobile 4 Series Chipset Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 07
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:44 memory:ff400000-ff7fffff memory:e0000000-efffffff ioport:cff8(size=8)
*-display:1 UNCLAIMED
description: Display controller
product: Mobile 4 Series Chipset Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2.1
bus info: pci@0000:00:02.1
version: 07
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: latency=0
resources: memory:ffc00000-ffcfffff

This issue seems identical to the one in this question, which was bizarrely closed. The output above is certainly very similar. Also it seems identical to the bug reported here.

Any help gratefully received.

Update: I have also now filed a bug report on this.

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