[Bug 88124] i915: regression: after DP connected (via docking station) monitor is turned off, when turned on, it does not work anymore

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88124

--- Comment #81 from Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> ---
Jiri,

Sorry about the bug getting closed, I haven't worked on this for a while. There
were no patches merged to address the connector ID change, so the retest on
drm-tip wasn't necessary IMO. However, there was another related issue (monitor
on-off) with the same configuration that got fixed. This was the reason for
@c58 and it seems like the thread got sidetracked since that point.

A quick note about the connector IDs. The connectors for displays attached to
the docking station are created and destroyed dynamically during during
hotplug/monitor off-on. This is why the ID's change and the flip-flopping of
connector ID's is probably due to the order in which connectors are destroyed
and created again. User space is typically able to handle this. Connector ID's
are stable only for ports directly connected to the GPU. For e.g., connector
82: type DP-2 for the docking station is what is going to stay the same.

As long as the kernel updates the connection status correctly and sends hotplug
events, user space is expected to deal with change in connector IDs. I am not
familiar with xmonad, so I don't know what's going on there. Let me see if I
can find out more.

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