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bug#15037: Display can't be opened (display newer than emacs session)


From: Sewall, Jason
Subject: bug#15037: Display can't be opened (display newer than emacs session)
Date: Wed, 7 Aug 2013 17:37:34 +0000

> From: Jan Djärv [mailto:address@hidden
> Sent: Wednesday, August 7, 2013 1:33 AM

> That is not what Emacs does.  "Reading available displays" is not possible.
> Emacs just tries to connect when you do open display.

Makes sense. 

> Did you kill the old server and start a new server in the same shell as you
> started the first?  My guess is that you did not, and so the second server
> either gets the correct authentication and thus can connect.

If you mean kill emacs and restart it, I could certainly do that (it will work, 
from past experience) but it defeats the purpose from my point of view. I'd 
like emacs to be able to create a frame on any display I ask it to, no matter 
the relative age of the emacs session and the remote display. If you mean 
(server-start), that is easy to do, but my understanding is that it has nothing 
to do with remote displays. Indeed, if I do emacs -Q (i.e., starting no 
servers) I am able to do that make-frame-on-display without trouble (for an 
emacs newer than the display)

> To really see what is going on you would need to debug Emacs with gdb
> when the make-frame-on-display fails.

While that is fine, as a somewhat experienced programmer and noob with Emacs 
internals, I am very surprised there isn't a higher-level way to debug this 
sort of problem in emacs-lisp. It isn't something I have the time to figure up 
right now at any rate.

Cheers,
Jason





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