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I'm working on my Thinkpad T430, with Intel HD4000 graphics chipset, in a 3-display setup (the laptop display and two external monitors). I accidentally pressed the Super + P combination, which cycles through display output modes. Even after cycling back to the original output mode, this has the unfortunate effect of limiting my external displays to a resolution lower than their native resolution. Any attempts to rectify this in System Settings > Displays are met with error messages like the following:

Could not set the configuration for CRTC 64

GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gnome_2drr_2derror_2dquark.Code2: could not set the configuration for CRTC 64

Even xrandr, when attempting to set resolution for one of the displays with xrandr --output HDMI2 --mode 1680x1050 merely returns xrandr: Configure crtc 1 failed

Other answers around the net cite similar errors when having issues with the kernel version limiting their ability to use 3-display setups with Intel graphics, but those issues were fixed several releases back, and my setup was working fine until I pressed Super + P just now, which caused it to go a little haywire. How can I successfully restore the original settings?

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Well, I solved this issue in the following manner:

  1. Navigate to System Settings > Displays again and select one of the external displays.

  2. Disable that display and hit Apply. At this point you should only have 1 active external display.

  3. Select the active display in the settings GUI and change its resolution to the preferred setting. It should apply successfully.

  4. Re-enable the other display, and you may find (as I did) that it has automatically assumed the same resolution setting as your first external display did.

I was never able to get a clear answer as to what was causing this issue from a technical standpoint, but I was able to find a solution which I figured ought to be documented.

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