On 1/17/2022 1:29 PM, Ken Whitesell wrote:
Problem: When moving an XTerm window from the primary display to the
second monitor, characters typed into that window are "clipped" at the
top. Only about the bottom 75% is drawn. No lower-case letters taller
than the "half-height" letters render properly. (Letters such as "a",
"c", "m", "n", etc are all rendered correctly. All capital letters and
tall lower-case letters (e.g. "b" and "d") have the top quarter
clipped off. Additionally the XTerm window shows thin black bars on
the right side of the window and along the bottom of the window.
The bash prompt and most all characters displayed as the result of the
output of a command all display correctly - this is *primarily*
affecting characters being typed, and before the "enter" key is
pressed. (There is one special case regarding displayed characters. If
a program is creating a full screen of output, such as "man", the top
line of the screen is clipped.)
If the window is in the primary display when the characters are typed,
and then the window is moved to the second monitor, the
previously-typed characters remain correctly formed, and only new
characters typed while the window is in the second monitor are clipped.
Environment: The primary display is the laptop's built-in display
(1920x1080, 17"). The second monitor is a 27" also at 1920x1080.
Operating system is Windows 10, with all current patches and updates.
(Ver reports Microsoft Windows [Version 10.0.19044.1466]). XWin server
is being started with this command line:
E:\cygwin64\bin\run.exe --quote /usr/bin/bash.exe -l -c "cd; exec
/usr/bin/startxwin -- -listen tcp"
Additional info: This appears to be related to using the display
"Scaling" option, where the laptop's display is set at 125% and the
external monitor's display is set at 100%. If I set both displays the
same - either both at 100% _or_ both at 125%, the problem does not
appear.
If I change the scaling from 125% to 100% on the laptop's display, the
problem appears until I restart Cygwin/X. Restarting Cygwin/X shows it
displaying properly, until I change the scaling again.
Note: XTerm is _not_ the only program that exhibits this behavior.
This is consistent among all applications tried, including geany,
hexedit, mate-terminal, and lxterminal. (The visual behavior is
slightly different for "full screen" application such as geany and
hexedit, but it's still apparent that some clipping is occurring with
characters being typed.)
Other version information: Cygwin setup version 2.915, packages
showing as up-to-date include xterm 370-1, xinit 1.4.1-1, xorg-server
21.1.3-1, xorg-x11-fonts-* 7.5-4. (Unsure what other information may
be useful.)
I've tried searching the message archives, going back through 2018 and
have not seen anything that appears relevant. Other searches haven't
proved useful, other than indicating that I should try applications
other than XTerm.
I have tried various settings in different locations, including
specifying "-resize=none" and/or -screen options for both monitors.
No changes have been made to system.XWinrc.
/etc/X11/xinit/startxwinrc has the following lines added before the
line "exec /usr/bin/xwin-xdg-menu" line at the bottom of the file:
/bin/xterm -fa 'DejaVu Sans Mono' -fs 12 -geometry 100x33 &
/bin/xterm -fa 'DejaVu Sans Mono' -fs 12 -geometry 100x33 &
/bin/xterm -fa 'DejaVu Sans Mono' -fs 12 -geometry 100x33 &
/bin/xterm -fa 'DejaVu Sans Mono' -fs 12 -geometry 100x33 &
There is no .startxwinrc file in $HOME.
I will gladly provide any additional information that may help.
Is there a known solution for this? (Or is it known that there is no
solution?)
Any guidance, pointers, suggestions of avenues for further research,
or other information, will all be greatly appreciated.
After more research and experimentation, it appears to be related to one
of xorg-server, xorg-server-common, or xorg-server-xorg.
Installing the older version 1.20.12-1 of these packages allows the
windows to be moved between monitors without any issues. Upgrading to
the current version 21.1.3-1 creates the problems. I'm able to replicate
this behavior on two different laptops with two different external monitors.
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