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Document some problems found during testing on various X servers

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* etc/PROBLEMS (General X problems): Document some problems
found during testing on various X servers.
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Po Lu 2022-02-08 21:32:07 +08:00
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commit b76da7e7a5
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etc/PROBLEMS
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@ -1709,6 +1709,65 @@ actual version of libXi installed does not. The solution is to
upgrade your libXi binaries to libXi 1.8.0 or later, to correspond
with your XInput headers.
*** Requesting a private colormap makes Emacs hang.
The part of Xlib that provides this feature is broken in modern
incarnations of Xlib, so it cannot possibly work. The solution is to
remove anything that looks like this:
Emacs.privateColormap: on
From your X defaults file. Your X server might also provide a
different visual class that will do what you want. You can experiment
with `TrueColor-8', by placing:
Emacs.visualClass: TrueColor-8
In your ~/.Xresources, and loading that file.
*** Colors messed up on Cairo builds or GTK builds.
If your display defaults to a visual where pixel values cannot be
directly converted to their corresponding real colors, a build with
Cairo drawing or GTK will display colors incorrectly. This is because
Cairo and GTK foolishly assume that all RGB values can be converted
directly from their individual components, without asking the X server
to allocate the color.
Your X server might have a different visual which is decomposed and
not colormapped. Try the following in your ~/.Xresources:
Emacs.visualClass: TrueColor-N
Where "N" is the bit depth of the visual your X server defaults to.
If that does not work, you lose. Configure Emacs '--without-cairo'
and '--with-x-toolkit=lucid' instead.
*** GUI widgets don't display on GTK builds, except for scrollbars.
This can happen if your visual does not have a decomposed colormap,
and your X server has the X rendering extension.
To solve the problem, disable the X rendering extension on your X
server, or rebuild Emacs without GTK+.
*** On Accelerated X, the GTK 3 menu bar does not select items.
The solution is to run Emacs with the environment variable 'GDK_DEBUG'
set to "nograbs", like this (where "..." stands for the other
command-line arguments you intend to pass to Emacs):
GDK_DEBUG=nograbs emacs ...
Accelerated X is a proprietary X server. Aside from being
proprietary, it has many other disadvantages, such as not supporting
most recent hardware and most modern extensions to the X protocol.
Consider switching to a free X server, such as X.Org.
If GTK complains about not being built with support for debugging
options, then there is nothing you can do, except for switching to a
free X server.
* Runtime problems on character terminals
*** With X forwarding, mouse highlighting can make Emacs slow.