[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 #84 from Jiri Pirko <jiri at resnulli.us> ---
(In reply to Ville Syrjala from comment #83)
> (In reply to Jiri Pirko from comment #82)
> > (In reply to Dhinakaran Pandiyan from comment #81)
> > > 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.
> > 
> > The thing is, there has to be some userspace daemon monitoring the events
> > and pushing the setting down accordingly. I have no such daemon.
> > Previously, before patch 0e32b39ceed665bfa4a77a4bc307b6652b991632, the ids
> > were stable so all worked fine even without need to any additional userspace
> > daemon.
> > Could you make the connector IDs stable again?
> 
> They were never actually stable. You just got lucky earlier.

Well, they were for many years. That is much longer than "never".

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