GNU bug report logs - #32334
Window resize fails in remote X11

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Russell Adams <Demo <at> Demosthenes.org>
To: bug-gnu-emacs <at> gnu.org
Subject: Window resize fails in remote X11
Date: Tue, 31 Jul 2018 12:21:39 +0200

From: Russell Adams <Russell.Adams <at> AdamsSystems.nl>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; Window resize failure in X11, text and modeline not visible
--text follows this line--

Using Emacs 26.1 on Gentoo Linux locally works fine full screen. If I
use X11 over SSH with Windows (VcXsrv) Emacs works until I resize the
window. If I increase the size of the window, the right and bottom edges
eventually disappear. I have an imgur gallery of screenshots:

https://imgur.com/a/AZiti9h

The text at the right and bottom is completely black, and typing or
other activities aren't visible at all. The scrollbar does remain.

----------------------------------------------------------------------

In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, X toolkit)
 of 2018-07-30 built on volibear
Windowing system distributor 'HC-Consult', version 11.0.12000000
Recent messages:
next-line: End of buffer [3 times]
Linum mode enabled in current buffer
next-line: End of buffer
scroll-down-command: Beginning of buffer [3 times]
mwheel-scroll: Beginning of buffer [3 times]
previous-line: Beginning of buffer [2 times]
mwheel-scroll: Beginning of buffer [3 times]
When done with this frame, type C-x 5 0
scroll-up-command: End of buffer
Quit
previous-line: Beginning of buffer [3 times]
Configured using:
 'configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --disable-silent-rules
 --docdir=/usr/share/doc/emacs-26.1-r1
 --htmldir=/usr/share/doc/emacs-26.1-r1/html --libdir=/usr/lib64
 --program-suffix=-emacs-26 --infodir=/usr/share/info/emacs-26
 --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --without-compress-install --without-hesiod --without-pop
 --with-file-notification=inotify --enable-acl --without-dbus
 --without-modules --without-gameuser --without-gpm --without-kerberos
 --without-kerberos5 --without-lcms2 --without-xml2 --without-mailutils
 --without-selinux --with-gnutls --without-libsystemd --with-threads
 --without-wide-int --with-zlib --with-sound=alsa --with-x --without-ns
 --without-gconf --without-gsettings --without-toolkit-scroll-bars
 --with-gif --with-jpeg --with-png --without-rsvg --with-tiff --with-xpm
 --without-imagemagick --with-xft --without-cairo --without-libotf
 --without-m17n-flt --with-x-toolkit=lucid --with-xaw3d
 'CFLAGS=-march=corei7 -O2 -pipe' CPPFLAGS= 'LDFLAGS=-Wl,-O1
 -Wl,--as-needed''

Configured features:
XAW3D XPM JPEG TIFF GIF PNG SOUND NOTIFY ACL GNUTLS FREETYPE XFT ZLIB
LUCID X11 THREADS

Important settings:
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  global-linum-mode: t
  linum-mode: t
  shell-dirtrack-mode: t
  company-mode: t
  paredit-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  rainbow-delimiters-mode: t
  show-paren-mode: t
  savehist-mode: t
  global-hl-line-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

Load-path shadows:
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/home/adamsrl/.emacs.d/elpa/org-20180730/org-clock hides /usr/share/emacs/26.1/lisp/org/org-clock
/home/adamsrl/.emacs.d/elpa/org-20180730/org-timer hides /usr/share/emacs/26.1/lisp/org/org-timer
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/home/adamsrl/.emacs.d/elpa/org-20180730/ob-scheme hides /usr/share/emacs/26.1/lisp/org/ob-scheme
/home/adamsrl/.emacs.d/elpa/org-20180730/org-attach hides /usr/share/emacs/26.1/lisp/org/org-attach
/home/adamsrl/.emacs.d/elpa/org-20180730/org-loaddefs hides /usr/share/emacs/26.1/lisp/org/org-loaddefs
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/home/adamsrl/.emacs.d/elpa/org-20180730/ob-lob hides /usr/share/emacs/26.1/lisp/org/ob-lob
/home/adamsrl/.emacs.d/elpa/org-20180730/org-rmail hides /usr/share/emacs/26.1/lisp/org/org-rmail
/home/adamsrl/.emacs.d/elpa/org-20180730/ob-calc hides /usr/share/emacs/26.1/lisp/org/ob-calc
/home/adamsrl/.emacs.d/elpa/org-20180730/org-crypt hides /usr/share/emacs/26.1/lisp/org/org-crypt
/home/adamsrl/.emacs.d/elpa/org-20180730/ob-ref hides /usr/share/emacs/26.1/lisp/org/ob-ref
/home/adamsrl/.emacs.d/elpa/org-20180730/org-mhe hides /usr/share/emacs/26.1/lisp/org/org-mhe
/home/adamsrl/.emacs.d/elpa/org-20180730/ob-exp hides /usr/share/emacs/26.1/lisp/org/ob-exp
/home/adamsrl/.emacs.d/elpa/org-20180730/org-ctags hides /usr/share/emacs/26.1/lisp/org/org-ctags
/home/adamsrl/.emacs.d/elpa/org-20180730/ob-mscgen hides /usr/share/emacs/26.1/lisp/org/ob-mscgen
/home/adamsrl/.emacs.d/elpa/org-20180730/org-footnote hides /usr/share/emacs/26.1/lisp/org/org-footnote
/home/adamsrl/.emacs.d/elpa/org-20180730/org-lint hides /usr/share/emacs/26.1/lisp/org/org-lint
/home/adamsrl/.emacs.d/elpa/org-20180730/ob-ocaml hides /usr/share/emacs/26.1/lisp/org/ob-ocaml
/home/adamsrl/.emacs.d/elpa/org-20180730/org-macro hides /usr/share/emacs/26.1/lisp/org/org-macro
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/home/adamsrl/.emacs.d/elpa/org-20180730/ob-lisp hides /usr/share/emacs/26.1/lisp/org/ob-lisp
/home/adamsrl/.emacs.d/elpa/org-20180730/ob-java hides /usr/share/emacs/26.1/lisp/org/ob-java
/home/adamsrl/.emacs.d/elpa/org-20180730/org-bbdb hides /usr/share/emacs/26.1/lisp/org/org-bbdb
/home/adamsrl/.emacs.d/elpa/org-20180730/org-faces hides /usr/share/emacs/26.1/lisp/org/org-faces
/home/adamsrl/.emacs.d/elpa/org-20180730/ob-ruby hides /usr/share/emacs/26.1/lisp/org/ob-ruby
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/home/adamsrl/.emacs.d/elpa/org-20180730/org-agenda hides /usr/share/emacs/26.1/lisp/org/org-agenda
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/home/adamsrl/.emacs.d/elpa/org-20180730/ob-latex hides /usr/share/emacs/26.1/lisp/org/ob-latex
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Features:
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backquote inotify dynamic-setting font-render-setting x-toolkit x
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Memory information:
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 (symbols 48 40144 1)
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Message #8 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Russell Adams <Demo <at> Demosthenes.org>
Cc: 32334 <at> debbugs.gnu.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Tue, 31 Jul 2018 19:27:15 +0300

> Date: Tue, 31 Jul 2018 12:21:39 +0200
> From: Russell Adams <Demo <at> Demosthenes.org>
> 
> Using Emacs 26.1 on Gentoo Linux locally works fine full screen. If I
> use X11 over SSH with Windows (VcXsrv) Emacs works until I resize the
> window. If I increase the size of the window, the right and bottom edges
> eventually disappear. I have an imgur gallery of screenshots:
> 
> https://imgur.com/a/AZiti9h
> 
> The text at the right and bottom is completely black, and typing or
> other activities aren't visible at all. The scrollbar does remain.

Does it help to disable double-buffering?  (NEWS tells how yo do
that.)

Message #11 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Russell Adams <Demo <at> Demosthenes.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32334 <at> debbugs.gnu.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Tue, 31 Jul 2018 18:35:01 +0200

On Tue, Jul 31, 2018 at 07:27:15PM +0300, Eli Zaretskii wrote:
> Does it help to disable double-buffering?  (NEWS tells how yo do
> that.)

That has fixed it. I could only describe the problem, not deduce it was related
to double buffering. Please close, thanks!


 --------------------------------------------------------------------------
   __
  (..)   Russell Adams / Demosthenes                   Demo <at> Demosthenes.org
  /\/\
 //  \\                                            Linux Powered since 1996
 ( __ )  PGP Key Id:     0xADA00D29
  ^  ^   Fingerprint:    E928 A47A E032 D745 753B  B8AD 36B1 68E1 ADA0 0D29

 --------------------------------------------------------------------------

Message #14 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Russell Adams <Demo <at> Demosthenes.org>
Cc: 32334 <at> debbugs.gnu.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Tue, 31 Jul 2018 20:03:19 +0300

merge 32334 25474
thanks

> Date: Tue, 31 Jul 2018 18:35:01 +0200
> From: Russell Adams <Demo <at> Demosthenes.org>
> Cc: 32334 <at> debbugs.gnu.org
> 
> On Tue, Jul 31, 2018 at 07:27:15PM +0300, Eli Zaretskii wrote:
> > Does it help to disable double-buffering?  (NEWS tells how yo do
> > that.)
> 
> That has fixed it. I could only describe the problem, not deduce it was related
> to double buffering.

It's not your fault.  I only know this because we've seen several
similar bugs before.

> Please close, thanks!

I merged this with the other bugs about this.  Closing is too early,
we still hope this could be fixed.

Message #19 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32334 <at> debbugs.gnu.org, Russell Adams <Demo <at> Demosthenes.org>
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Wed, 01 Aug 2018 15:01:25 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> merge 32334 25474
> thanks
>
>> Date: Tue, 31 Jul 2018 18:35:01 +0200
>> From: Russell Adams <Demo <at> Demosthenes.org>
>> Cc: 32334 <at> debbugs.gnu.org
>> 
>> On Tue, Jul 31, 2018 at 07:27:15PM +0300, Eli Zaretskii wrote:
>> > Does it help to disable double-buffering?  (NEWS tells how yo do
>> > that.)
>> 
>> That has fixed it. I could only describe the problem, not deduce it was related
>> to double buffering.
>
> It's not your fault.  I only know this because we've seen several
> similar bugs before.
>
>> Please close, thanks!
>
> I merged this with the other bugs about this.  Closing is too early,
> we still hope this could be fixed.

How can we fix it other than by disabling double buffering by default
and hoping people read NEWS and turn it on again? Iʼm not aware of a
way to programatically detect "your X server's implementation of XDBE
is buggy"

Robert

Message #22 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Wed, 01 Aug 2018 16:09:10 +0300

> From: Robert Pluim <rpluim <at> gmail.com>
> Cc: Russell Adams <Demo <at> Demosthenes.org>,  32334 <at> debbugs.gnu.org
> Date: Wed, 01 Aug 2018 15:01:25 +0200
> 
> > I merged this with the other bugs about this.  Closing is too early,
> > we still hope this could be fixed.
> 
> How can we fix it other than by disabling double buffering by default
> and hoping people read NEWS and turn it on again? Iʼm not aware of a
> way to programatically detect "your X server's implementation of XDBE
> is buggy"

I'm not even sure that's a bug in the X server.  It could be a bug in
our code, for all I know.  If we arrive at the conclusion that it's a
bug in the server, that would be a very good progress, IMO.

Message #25 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Wed, 01 Aug 2018 15:27:56 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Robert Pluim <rpluim <at> gmail.com>
>> Cc: Russell Adams <Demo <at> Demosthenes.org>,  32334 <at> debbugs.gnu.org
>> Date: Wed, 01 Aug 2018 15:01:25 +0200
>> 
>> > I merged this with the other bugs about this.  Closing is too early,
>> > we still hope this could be fixed.
>> 
>> How can we fix it other than by disabling double buffering by default
>> and hoping people read NEWS and turn it on again? Iʼm not aware of a
>> way to programatically detect "your X server's implementation of XDBE
>> is buggy"
>
> I'm not even sure that's a bug in the X server.  It could be a bug in
> our code, for all I know.  If we arrive at the conclusion that it's a
> bug in the server, that would be a very good progress, IMO.

Iʼm going to have to agree with you: the changes to support
double-buffering in emacs are far more extensive than I initially
thought, so bugs are definitely possible.

Robert

Message #28 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Thu, 02 Aug 2018 15:49:07 +0200

Robert Pluim <rpluim <at> gmail.com> writes:

> Eli Zaretskii <eliz <at> gnu.org> writes:

>> I'm not even sure that's a bug in the X server.  It could be a bug in
>> our code, for all I know.  If we arrive at the conclusion that it's a
>> bug in the server, that would be a very good progress, IMO.
>
> Iʼm going to have to agree with you: the changes to support
> double-buffering in emacs are far more extensive than I initially
> thought, so bugs are definitely possible.

I tested this quickly last night with VcXsrv, and itʼs utterly broken
with emacs-26 built for GTK when using double buffering: the entire
text area of the initial frame never gets updated. With lucid itʼs
slightly better in that half the frame gets refreshed. That does
suggest that the bug is in emacs (especially since VcXsrv is
essentially xorg recompiled for Windows).

Initial debugging showed that the appropriated XDBE calls are being
made, so perhaps the initial setup of the frame is at fault. More
debugging this weekend, I hope.

Robert

Message #31 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Thu, 02 Aug 2018 17:09:38 +0300

> From: Robert Pluim <rpluim <at> gmail.com>
> Cc: Demo <at> Demosthenes.org,  32334 <at> debbugs.gnu.org
> Date: Thu, 02 Aug 2018 15:49:07 +0200
> 
> Initial debugging showed that the appropriated XDBE calls are being
> made, so perhaps the initial setup of the frame is at fault. More
> debugging this weekend, I hope.

Thank you for working on this annoying problem.

Message #34 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Mon, 06 Aug 2018 12:12:51 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Robert Pluim <rpluim <at> gmail.com>
>> Cc: Demo <at> Demosthenes.org,  32334 <at> debbugs.gnu.org
>> Date: Thu, 02 Aug 2018 15:49:07 +0200
>> 
>> Initial debugging showed that the appropriated XDBE calls are being
>> made, so perhaps the initial setup of the frame is at fault. More
>> debugging this weekend, I hope.
>
> Thank you for working on this annoying problem.

So hereʼs what I have so far:

- Either no other program on the internet uses XDBE, or if they do
  their users never use X11 forwarding over ssh
- The emacs toolkit type doesnʼt matter, they all have visual problems
  of one kind or another
- XDBE calls are definitely being made, and they're not returning
  errors
- Itʼs not a timing issue: if I delay the XDBE setup until after the
  initial frame has been set up and shown, then visual problems still
  start occuring immediately after the XDBE initialization

I also tested with Cygwin's XServer, which supports the double
buffering extension. I used the same ssh session, and emacs came up
and looked and worked fine.

So at this point itʼs looking more like an issue with VcXsrv than with
emacs. Iʼll see if I can engage with them after I get back from vacation.

Robert

Message #37 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Mon, 06 Aug 2018 18:21:47 +0300

> From: Robert Pluim <rpluim <at> gmail.com>
> Cc: Demo <at> Demosthenes.org,  32334 <at> debbugs.gnu.org
> Date: Mon, 06 Aug 2018 12:12:51 +0200
> 
> I also tested with Cygwin's XServer, which supports the double
> buffering extension. I used the same ssh session, and emacs came up
> and looked and worked fine.
> 
> So at this point itʼs looking more like an issue with VcXsrv than with
> emacs. Iʼll see if I can engage with them after I get back from vacation.

Thanks, I think we are making good progress here.  If nothing else, we
could update etc/PROBLEMS with the information about the faulty X
server and the suggested replacement/workaround.

Does x-server-vendor and/or x-server-version disclose in any way that
this particular X server is being used?

Message #40 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Robert Pluim <rpluim <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Tue, 07 Aug 2018 10:35:37 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Robert Pluim <rpluim <at> gmail.com>
>> Cc: Demo <at> Demosthenes.org,  32334 <at> debbugs.gnu.org
>> Date: Mon, 06 Aug 2018 12:12:51 +0200
>> 
>> I also tested with Cygwin's XServer, which supports the double
>> buffering extension. I used the same ssh session, and emacs came up
>> and looked and worked fine.
>> 
>> So at this point itʼs looking more like an issue with VcXsrv than with
>> emacs. Iʼll see if I can engage with them after I get back from vacation.
>
> Thanks, I think we are making good progress here.  If nothing else, we
> could update etc/PROBLEMS with the information about the faulty X
> server and the suggested replacement/workaround.
>
> Does x-server-vendor and/or x-server-version disclose in any way that
> this particular X server is being used?

This is pretty close to what I see on Xorg on Ubuntu, so probably can't be used:

(x-server-version)
(11 0 12000001)

But this looks fairly unique:

(x-server-vendor)
"HC-Consult"

Were you thinking of conditionally disabling double-buffering based on
x-server-vendor?

Robert

Message #43 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Robert Pluim <rpluim <at> gmail.com>
Cc: 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Tue, 07 Aug 2018 17:42:30 +0300

> From: Robert Pluim <rpluim <at> gmail.com>
> Cc: Demo <at> Demosthenes.org,  32334 <at> debbugs.gnu.org
> Date: Tue, 07 Aug 2018 10:35:37 +0200
> 
> > Does x-server-vendor and/or x-server-version disclose in any way that
> > this particular X server is being used?
> 
> This is pretty close to what I see on Xorg on Ubuntu, so probably can't be used:
> 
> (x-server-version)
> (11 0 12000001)
> 
> But this looks fairly unique:
> 
> (x-server-vendor)
> "HC-Consult"
> 
> Were you thinking of conditionally disabling double-buffering based on
> x-server-vendor?

As Plan B, if no better solution is possible/practical, yes.

Message #46 received at 32334 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Eli Zaretskii <eliz <at> gnu.org>, 32334 <at> debbugs.gnu.org, Demo <at> Demosthenes.org
Subject: Re: bug#32334: Window resize fails in remote X11
Date: Sun, 13 Feb 2022 14:00:26 +0800

Robert Pluim <rpluim <at> gmail.com> writes:

> - Either no other program on the internet uses XDBE, or if they do
>   their users never use X11 forwarding over ssh
> - The emacs toolkit type doesnʼt matter, they all have visual problems
>   of one kind or another
> - XDBE calls are definitely being made, and they're not returning
>   errors
> - Itʼs not a timing issue: if I delay the XDBE setup until after the
>   initial frame has been set up and shown, then visual problems still
>   start occuring immediately after the XDBE initialization
>
> I also tested with Cygwin's XServer, which supports the double
> buffering extension. I used the same ssh session, and emacs came up
> and looked and worked fine.
>
> So at this point itʼs looking more like an issue with VcXsrv than with
> emacs. Iʼll see if I can engage with them after I get back from vacation.

Emacs is the only living program that still uses the double buffer
extension.  It is considered an obsolete but supported extension by the
X.Org developers, and not much priority is given to it by other X server
developers, aside from ensuring that the code to support it still
builds.

The recommended alternative is to create a pixmap and to use that as a
back buffer instead.  It will completely mess up color allocation on
some other X servers, and might lead to sub-optimial memory usage, so
replacing the Xdbe code with that entirely is not an option.

Instead, we could use the pixmap strategy on X servers that are known to
be buggy.  Off the back of my head I can list Hummingbird's X servers
(`x-server-vendor' usually returns "Hummingbird Ltd." or some variant
thereof), VcXsrv (which unfortunately cannot be easily identified) and
some versions of Xming (which identifies itself as X.Org, not much help
there either.)

The easy solution would to simply disable double buffering on those
servers, at the cost of some extra flickering to their users.

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