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I have an "ATI Mobility Radeon HD 5650" Graphics card, with 1 VGA and 1 HDMI port, + main monitor on my laptop and 2 external monitors. I'm trying to connect my third monitor but whenever I try to "extend desktop to this display" the other external monitors goes off.

http://palprof.com/monitors.png

I just tried it on Ubuntu and the 3 worked perfectly. On Windows 7 they are not, also tried Catalyst it does detect 3 monitors but when I go to Create Eyefinity group, it only shows 2.

I tried having Windows 7 auto update graphics card drivers, still same problem.

Any ideas ?

2 Answers 2

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Your hardware does not allow connecting hdmi and vga at the same time. Most hardware even modern ones do not allow this. There is a usb to vga cable though that will allow you to circumvent this and have your third monitor appear simultaneously.

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    Come on Ahmad, why is it working on Linux with no problems if it's a hardware issue
    – Amin
    Apr 15, 2015 at 11:39
  • Drivers perhaps, did your laptop originally come with Linux?
    – Ahmed
    Apr 15, 2015 at 14:37
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Reinstall the Graphics driver directly from the Manufacturer. Don't install it using Windows Update or by letting the Driver Installer search online.

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  • Driver had Problem in Windows . in Linux you not see but it's installed before on the Kernel and your ubuntu . but windows is Different Apr 15, 2015 at 4:28

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