GNU logs - #32334, boring messages

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#32334: Window resize fails in remote X11
Resent-From: Russell Adams <Demo@HIDDEN>
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Resent-Date: Tue, 31 Jul 2018 15:18:01 +0000
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To: 32334 <at> debbugs.gnu.org
Date: Tue, 31 Jul 2018 12:21:39 +0200
From: Russell Adams <Demo@HIDDEN>
Message-ID: <20180731102139.GA24976@volibear>
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From: Russell Adams <Russell.Adams@HIDDEN>
To: bug-gnu-emacs@HIDDEN
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:
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  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
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  global-font-lock-mode: t
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Memory information:
((conses 16 296686 23122)
 (symbols 48 40144 1)
 (miscs 40 159 262)
 (strings 32 108643 2461)
 (string-bytes 1 3261685)
 (vectors 16 42244)
 (vector-slots 8 805719 7122)
 (floats 8 326 180)
 (intervals 56 1627 838)
 (buffers 992 15))

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
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Subject: bug#32334: Acknowledgement (Window resize fails in remote X11)
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References: <20180731102139.GA24976@volibear>
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32334: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D32334
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#32334: Window resize fails in remote X11
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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From: Eli Zaretskii <eliz@HIDDEN>
In-reply-to: <20180731102139.GA24976@volibear> (message from Russell Adams on
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> Date: Tue, 31 Jul 2018 12:21:39 +0200
> From: Russell Adams <Demo@HIDDEN>
> 
> 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 sent to bug-gnu-emacs@HIDDEN:

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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@HIDDEN
  /\/\
 //  \\                                            Linux Powered since 1996
 ( __ )  PGP Key Id:     0xADA00D29
  ^  ^   Fingerprint:    E928 A47A E032 D745 753B  B8AD 36B1 68E1 ADA0 0D29

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

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merge 32334 25474
thanks

> Date: Tue, 31 Jul 2018 18:35:01 +0200
> From: Russell Adams <Demo@HIDDEN>
> 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.

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# previous merge seems to have failed due to severity mismatch
forcemerge 25474 32334
quit

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Eli Zaretskii <eliz@HIDDEN> writes:

> merge 32334 25474
> thanks
>
>> Date: Tue, 31 Jul 2018 18:35:01 +0200
>> From: Russell Adams <Demo@HIDDEN>
>> Cc: 32334 <at> debbugs.gnu.org
>>=20
>> 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.)
>>=20
>> 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? I=CA=BCm not aware of a
way to programatically detect "your X server's implementation of XDBE
is buggy"

Robert

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> From: Robert Pluim <rpluim@HIDDEN>
> Cc: Russell Adams <Demo@HIDDEN>,  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.

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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Robert Pluim <rpluim@HIDDEN>
>> Cc: Russell Adams <Demo@HIDDEN>,  32334 <at> debbugs.gnu.org
>> Date: Wed, 01 Aug 2018 15:01:25 +0200
>>=20
>> > I merged this with the other bugs about this.  Closing is too early,
>> > we still hope this could be fixed.
>>=20
>> How can we fix it other than by disabling double buffering by default
>> and hoping people read NEWS and turn it on again? I=CA=BCm 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.

I=CA=BCm 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

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Robert Pluim <rpluim@HIDDEN> writes:

> Eli Zaretskii <eliz@HIDDEN> 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.
>
> I=CA=BCm 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 it=CA=BCs 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 it=CA=BCs
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

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> From: Robert Pluim <rpluim@HIDDEN>
> Cc: Demo@HIDDEN,  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.

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From: Robert Pluim <rpluim@HIDDEN>
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Robert Pluim <rpluim@HIDDEN>
>> Cc: Demo@HIDDEN,  32334 <at> debbugs.gnu.org
>> Date: Thu, 02 Aug 2018 15:49:07 +0200
>>=20
>> 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 here=CA=BCs 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 doesn=CA=BCt matter, they all have visual problems
  of one kind or another
- XDBE calls are definitely being made, and they're not returning
  errors
- It=CA=BCs 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 it=CA=BCs looking more like an issue with VcXsrv than with
emacs. I=CA=BCll see if I can engage with them after I get back from vacati=
on.

Robert

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> From: Robert Pluim <rpluim@HIDDEN>
> Cc: Demo@HIDDEN,  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?

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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Robert Pluim <rpluim@HIDDEN>
>> Cc: Demo@HIDDEN,  32334 <at> debbugs.gnu.org
>> Date: Mon, 06 Aug 2018 12:12:51 +0200
>>=20
>> 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.
>>=20
>> So at this point it=CA=BCs looking more like an issue with VcXsrv than w=
ith
>> emacs. I=CA=BCll see if I can engage with them after I get back from vac=
ation.
>
> 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

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> From: Robert Pluim <rpluim@HIDDEN>
> Cc: Demo@HIDDEN,  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 sent to bug-gnu-emacs@HIDDEN:

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Date: Sun, 13 Feb 2022 14:00:26 +0800
In-Reply-To: <87y3djby70.fsf@HIDDEN> (Robert Pluim's message of "Mon, 06
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Robert Pluim <rpluim@HIDDEN> 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 doesn=CA=BCt matter, they all have visual proble=
ms
>   of one kind or another
> - XDBE calls are definitely being made, and they're not returning
>   errors
> - It=CA=BCs 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 it=CA=BCs looking more like an issue with VcXsrv than wi=
th
> emacs. I=CA=BCll see if I can engage with them after I get back from vaca=
tion.

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.

Last modified: Sun, 13 Feb 2022 06:15:02 UTC

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