[Bug 109668] ctrl-alt-f2 + alt-f1 always crashes X server

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109668

--- Comment #16 from Swati Sharma <swati2.sharma at intel.com> ---
Hi Kratochvil,

drm_atomic_helper_check_modeset() is used to validate state object for modeset
changes. This function is returning EINVAL. In turn, IOCTL is getting failed. 

We entered into the above scenario because blob which is used for setting mode
property for CRTC is NULL which leads to NOMODE and setting state->enable to
false.
[drm:drm_atomic_set_mode_prop_for_crtc [drm]] Set [NOMODE] for [CRTC:47:pipe A]
state 00000000b992248f

Which later leads to "enabled/connectors mismatch".

Looks like it may not be a driver issue and it could be how commits are being
sent from the userland in case of switching from console to graphics mode.

Tried with vanilla Ubuntu 16.04 with 2 external displays and kernel version
5.1.0+ however was not able to reproduce issue.

If you are still getting the issue with the latest kernel, please send proper
steps to reproduce the issue with proper configuration like which all displays
getting used, kernel version, display_info, userland library details etc. 

#assessed

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