[PATCH 2/3] modesetting: add dynamic connector hotplug support (MST) (v2)

Keith Packard keithp at keithp.com
Mon Apr 13 20:12:55 PDT 2015

Dave Airlie <airlied at gmail.com> writes:

> So we hot unplug, we remove the output XID from the server, in
> parallel the client does an operation with the output XID it has
> gotten already, and still believe is valid, and it gets BadMatch, and
> since hardly anyone handles X errors it falls over.

Yeah, I was curious if you'd found an actual race condition that
couldn't be solved by correctly written applications. Sounds like it's
just 'buggy' clients.

Given that there just aren't that many applications which deal with
RandR objects, it's pretty tempting to let them experience reality for a
year or so and expect that they'll get fixed.

As I said, the alternative would be to amend the spec to say that
outputs may get added, but will never go away. That would enshrine their
behavior as compliant, and ensure that we'd never break them in the

Frankly, I think I'd probably be OK with either plan, the only one I'm
not up for is supporting both modes with a configuration parameter that
no-one in their right mind would enable.

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