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On one machine (Dell Latitude E7440) running Ubuntu 16.04, when I try to switch to a TTY (e.g. using Ctrl+Alt+F1 or sudo chvt 1), nothing happens.

I keep seeing the last state of my graphical desktop instead of a TTY terminal login, although it is frozen and not accepting any input. Switching back to TTY7 using Ctrl+Alt+F7 brings the desktop back to life as expected.

Why can I not switch to a TTY terminal on this system? How can I diagnose and fix the issue?

$ lspci -k | grep -iEA4 '3d|vga|display'
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
    DeviceName:  Onboard IGD
    Subsystem: Dell Haswell-ULT Integrated Graphics Controller
    Kernel driver in use: i915
    Kernel modules: i915
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    Does this laptop have a graphics card? – muru Jan 29 '18 at 9:19
  • @muru No, only the integrated Intel Haswell graphics. Added the lspci -k output to my question. – Byte Commander Jan 29 '18 at 9:25
  • Have you solved the problem? I've got a similar situation, instead of getting into the tty what I see is the log of startx command that has been run on the tty which X is running, most of the times I can't even return to my working tty and I have to reboot. Haswell here too. – Ravexina Apr 3 '18 at 10:51
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    @Ravexina Nope, no news from my side. But strangely, currently it works. Maybe it was related to the docking station I used? Don't have access to it currently though, so can't verify that... – Byte Commander Apr 3 '18 at 11:02

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