Ubuntu – VGA Port Not Working 19.10 Update


System is Intel® Core™ i7-7700K CPU @ 4.20GHz × 8 with Intel® HD Graphics 630 (Kaby Lake GT2). Motherboard is ASUS PRIME B250M-A

Updated to 19.10 yesterday and the VGA display port no longer works. I was running a three monitor display setup in 19.04 utilizing the HDMI, DVI, and VGA outputs.

After upgrading to 19.10, I can no longer get to the login screen when the VGA port is connected. It will boot up, but once it gets to trying to enable the login display manager, it flashes a red screen, then goes black, then flashes, and so on. This occurs even if I disconnect all other displays and use just the VGA port.

At one point during testing, I was able to press Ctrl+Alt +F4, wasn't able to get a login prompt, but did see some messages similar to this:

drm intel_dp_start_link_timeout

I don't have the exact error unfortunately, and could not find it in the logs anywhere. This would print out every few seconds, and seemed to align with the red flashes.

Best Answer

I had the same problem after upgrading from 19.04 to 19.10:

VGA, no signal

I have no idea where the signal went since VGA was working fine in 19.04!
Fortunately, I used the grub menu at boot, and it displays three choices:

  • Select the "Advanced Options" choice. The next screen will display four choices:
  • Scroll to the last option and select, "Ubuntu...recovery mode" (there are two "recovery mode" selections, but the last one works the best for me). A lot of code will scroll down the screen including code for 19.10, after which you will be prompted with two final screens:
  • just hit the Enter key for both screens.
  • Lastly, you will get to stare at a blank screen with the cursor blinking in the upper left hand corner for a minute or two, and then Upgrade 19.10 will appear on your screen (or at least it appeared on my screen. Hopefully you will have the same experience).
  • BTW, in case you don't use the Grub menu at boot, click this link for help with the Grub menu.

Hope this helps.

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