Restarting video driver to turn on external vga port

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I have a Lenovo x140e running F38.

The video driver is normally the Radeon, but some time ago here I was told to change the amdgpu driver but

lspci -nnk | grep -iE "VGA|DISPLAY" -A3
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Kabini [Radeon HD 8330] [1002:9832]
    Subsystem: Lenovo Device [17aa:2219]
    Kernel driver in use: amdgpu
    Kernel modules: radeon, amdgpu

But sometimes after a few suspend/unsuspend when remote and no external VGA, this system forgets about the external monitor.

Is there someway to force the video driver to wake up and see the attached vga monitor?

thanks
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