"Monitor configuration has gaps" message when using resolution scaling on xwayland/xfreerdp in app-mode

[jwalt]

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Describe the bug In a multi-monitor setup, using xfreerdp under wayland (i.e. via xwayland, using KDE kwin as wayland compositor), when the main (left) screen is scaled and there is a second (right) screen (no matter if scaled or not), then xfreerdp in app-mode aborts with the following message:

[18:56:25:871] [108663:0001a878] [ERROR][com.freerdp.settings] - [monitor_has_gaps]: Monitor configuration has gaps! Monitor 0 does not have any neighbor
[18:56:25:871] [108663:0001a878] [ERROR][com.freerdp.settings] - [freerdp_settings_check_client_after_preconnect]: Invalid or unsupported monitor configuration detected
[18:56:25:871] [108663:0001a878] [ERROR][com.freerdp.settings] - [freerdp_settings_check_client_after_preconnect]: Check if the configuration is valid.

Command line:

xfreerdp3 /d: /u:redacted /from-stdin /v:192.168.123.123 +auto-reconnect +clipboard +home-drive -wallpaper /scale:180 /dynamic-resolution /multimon /app:program:explorer.exe

When swapping the monitor layout so that the unscaled monitor is left, there is no error and everything works as expected.

To Reproduce Steps to reproduce the behavior:

1. Have a dual-monitor left/right (or top/down) setup, where the left/top monitor is scaled, e.g. by 150%
2. Try to start xfreerdp (command line above)
3. observe error message above

Expected behavior normal operation of xfreerdp

Application details

• Command line see above
• Output of xfreerdp /buildconfig

This is FreeRDP version [xfreerdp3] 3.12.0 (n/a)
[xfreerdp3] Build configuration: BUILD_TESTING=OFF BUILD_TESTING_INTERNAL=OFF BUILD_TESTING_INTERNAL_AVAILABLE=1 BUILD_TESTING_NO_H264=OFF BUILD_TESTING_NO_H264_AVAILABLE=0 WINPR_HAVE_AIO_H=1 WINPR_HAVE_EXECINFO_BACKTRACE=1 WINPR_HAVE_EXECINFO_BACKTRACE_SYMBOLS=1 WINPR_HAVE_EXECINFO_BACKTRACE_SYMBOLS_FD=1 WINPR_HAVE_EXECINFO_HEADER=1 WINPR_HAVE_FCNTL_H=1 WINPR_HAVE_GETLOGIN_R=1 WINPR_HAVE_GETPWUID_R=1 WINPR_HAVE_INTTYPES_H=1 WINPR_HAVE_POLL_H=1 WINPR_HAVE_PTHREAD_MUTEX_TIMEDLOCK_LIB=1 WINPR_HAVE_PTHREAD_MUTEX_TIMEDLOCK_LIBS= WINPR_HAVE_PTHREAD_MUTEX_TIMEDLOCK_SYMBOL=1 WINPR_HAVE_STDBOOL_H=1 WINPR_HAVE_STDINT_H=1 WINPR_HAVE_STRERROR_R=1 WINPR_HAVE_STRNDUP=1 WINPR_HAVE_SYSLOG_H=1 WINPR_HAVE_SYS_EVENTFD_H=1 WINPR_HAVE_SYS_FILIO_H= WINPR_HAVE_SYS_SELECT_H=1 WINPR_HAVE_SYS_SOCKIO_H= WINPR_HAVE_SYS_TIMERFD_H=1 WINPR_HAVE_TM_GMTOFF=1 WINPR_HAVE_UNISTD_H=1 WINPR_HAVE_UNWIND_H=1 WITH_AAD=ON WITH_ABSOLUTE_PLUGIN_LOAD_PATHS=ON WITH_ADD_PLUGIN_TO_RPATH=OFF WITH_ALSA=ON WITH_AVX2=ON WITH_BINARY_VERSIONING=ON WITH_CAIRO=OFF WITH_CCACHE=ON WITH_CHANNELS=ON WITH_CJSON_REQUIRED=OFF WITH_CLANG_FORMAT=ON WITH_CLIENT=ON WITH_CLIENT_AVAILABLE=1 WITH_CLIENT_CHANNELS=ON WITH_CLIENT_CHANNELS_AVAILABLE=1 WITH_CLIENT_COMMON=ON WITH_CLIENT_INTERFACE=OFF WITH_CLIENT_SDL=ON WITH_CLIENT_SDL2=ON WITH_CLIENT_SDL3=OFF WITH_CLIENT_SDL_AVAILABLE=1 WITH_CLIENT_SDL_VERSIONED=OFF WITH_CUPS=ON WITH_DEBUG_ALL=OFF WITH_DEBUG_CAPABILITIES=OFF WITH_DEBUG_CERTIFICATE=OFF WITH_DEBUG_CHANNELS=OFF WITH_DEBUG_CLIPRDR=OFF WITH_DEBUG_CODECS=OFF WITH_DEBUG_DVC=OFF WITH_DEBUG_EVENTS=OFF WITH_DEBUG_KBD=OFF WITH_DEBUG_LICENSE=OFF WITH_DEBUG_MUTEX=OFF WITH_DEBUG_NEGO=OFF WITH_DEBUG_NLA=OFF WITH_DEBUG_NTLM=OFF WITH_DEBUG_RAIL=OFF WITH_DEBUG_RDP=OFF WITH_DEBUG_RDPDR=OFF WITH_DEBUG_RDPEI=OFF WITH_DEBUG_RDPGFX=OFF WITH_DEBUG_REDIR=OFF WITH_DEBUG_RFX=OFF WITH_DEBUG_RINGBUFFER=OFF WITH_DEBUG_SCARD=OFF WITH_DEBUG_SCHANNEL=OFF WITH_DEBUG_SDL_EVENTS=OFF WITH_DEBUG_SDL_KBD_EVENTS=OFF WITH_DEBUG_SND=OFF WITH_DEBUG_SVC=OFF WITH_DEBUG_SYMBOLS=OFF WITH_DEBUG_THREADS=OFF WITH_DEBUG_TIMEZONE=OFF WITH_DEBUG_TRANSPORT=OFF WITH_DEBUG_TSG=OFF WITH_DEBUG_TSMF=OFF WITH_DEBUG_TSMF_AVAILABLE=0 WITH_DEBUG_URBDRC=OFF WITH_DEBUG_WND=OFF WITH_DEBUG_X11=OFF WITH_DEBUG_X11_LOCAL_MOVESIZE=OFF WITH_DEBUG_XV=OFF WITH_DOCUMENTATION=OFF WITH_DSP_EXPERIMENTAL=OFF WITH_DSP_FFMPEG=ON WITH_DSP_FFMPEG_AVAILABLE=1 WITH_EVENTFD_READ_WRITE=1 WITH_FAAC=OFF WITH_FAAD2=OFF WITH_FDK_AAC=OFF WITH_FFMPEG=ON WITH_FREERDP_DEPRECATED=OFF WITH_FREERDP_DEPRECATED_COMMANDLINE=OFF WITH_FULL_CONFIG_PATH=OFF WITH_FUSE=ON WITH_GFX_FRAME_DUMP=OFF WITH_GFX_H264=ON WITH_GPROF=OFF WITH_GSM=OFF WITH_ICU=ON WITH_INSTALL_CLIENT_DESKTOP_FILES=OFF WITH_INTERNAL_MD4=OFF WITH_INTERNAL_MD5=OFF WITH_INTERNAL_RC4=OFF WITH_JPEG=ON WITH_JSONC_REQUIRED=OFF WITH_JSON_DISABLED=OFF WITH_KEYBOARD_LAYOUT_FROM_FILE=OFF WITH_KRB5=ON WITH_KRB5_NO_NTLM_FALLBACK=OFF WITH_LAME=OFF WITH_LIBRARY_VERSIONING=ON WITH_LIBRESSL=OFF WITH_LODEPNG=OFF WITH_MACAUDIO=OFF WITH_MACAUDIO_AVAILABLE=0 WITH_MANPAGES=ON WITH_MBEDTLS=OFF WITH_NATIVE_SSPI=OFF WITH_NO_UNDEFINED=OFF WITH_OPENCL=OFF WITH_OPENH264=OFF WITH_OPENSSL=ON WITH_OPUS=OFF WITH_OSS=ON WITH_PCSC=ONWITH_PKCS11=ON WITH_PLATFORM_SERVER=ON WITH_POLL=ON WITH_PROFILER=OFF WITH_PROXY=ON WITH_PROXY_APP=ON WITH_PROXY_EMULATE_SMARTCARD=OFF WITH_PROXY_MODULES=ON WITH_PULSE=ON WITH_RDTK=ON WITH_RESOURCE_VERSIONING=OFF WITH_SAMPLE=ON WITH_SANITIZE_ADDRESS=OFF WITH_SANITIZE_ADDRESS_AVAILABLE=1 WITH_SANITIZE_MEMORY=OFF WITH_SANITIZE_MEMORY_AVAILABLE=1 WITH_SANITIZE_THREAD=OFF WITH_SANITIZE_THREAD_AVAILABLE=1 WITH_SDL_IMAGE_DIALOGS=OFF WITH_SDL_LINK_SHARED=ON WITH_SERVER=ON WITH_SERVER_CHANNELS=ON WITH_SERVER_INTERFACE=ON WITH_SHADOW=ON WITH_SIMD=ON WITH_SMARTCARD_EMULATE=ON WITH_SMARTCARD_INSPECT=OFF WITH_SMARTCARD_PCSC=ON WITH_SOXR=OFF WITH_STREAMPOOL_DEBUG=OFF WITH_SWSCALE=ON WITH_SYSTEMD=ON WITH_THIRD_PARTY=OFF WITH_TIMEZONE_COMPILED=ON WITH_TIMEZONE_FROM_FILE=OFF WITH_TIMEZONE_ICU=OFF WITH_UNICODE_BUILTIN=OFF WITH_URIPARSER=OFF WITH_VAAPI=OFF WITH_VAAPI_AVAILABLE=1 WITH_VAAPI_H264_ENCODING=ON WITH_VAAPI_H264_ENCODING_AVAILABLE=1 WITH_VALGRIND_MEMCHECK=OFF WITH_VALGRIND_MEMCHECK_AVAILABLE=1 WITH_VERBOSE_WINPR_ASSERT=OFF WITH_VIDEO_FFMPEG=ON WITH_VIDEO_FFMPEG_AVAILABLE=1 WITH_WAYLAND=ON WITH_WEBVIEW=OFF WITH_WINPR_DEPRECATED=OFF WITH_WINPR_JSON=ON WITH_WINPR_TOOLS=ON WITH_WIN_CONSOLE=ON WITH_X11=ON WITH_XCURSOR=ON WITH_XEXT=ON WITH_XFIXES=ON WITH_XI=ON WITH_XINERAMA=ON WITH_XRANDR=ON WITH_XRENDER=ON WITH_XV=ON
Build type:          Release
CFLAGS:              -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions         -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security         -fstack-clash-protection -fcf-protection         -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g -ffile-prefix-map=/build/freerdp/src=/usr/src/debug/freerdp -flto=auto -Wno-incompatible-pointer-types -fno-omit-frame-pointer -Wredundant-decls -Wimplicit-function-declaration -O3 -DNDEBUG
Compiler:            GNU, 14.2.1
Target architecture: x64

• OS version connecting to (server side): Windows 11 Pro

Environment (please complete the following information):

• OS: Arch Linux
• Version/Distribution: n/a
• Architecture: amd64

[akallabeth]

@jwalt does the monitors have gaps? what does xrandr -q give you?

(sorry for the late reply, rather busy :/)

[jwalt]

@jwalt does the monitors have gaps? what does xrandr -q give you?

(sorry for the late reply, rather busy :/)

No, there are no gaps (after scaling). Wehn only looking at unscaled, physical pixel dimensions then yes, there would be a gap.

[akallabeth]

@jwalt xrandr output please

[akallabeth]

can not reproduce, original reporter did not provide requested data, closing.

[axelhahn]

Just landed here because I had the same problem....

Solution: The problem that was on my client with 2 monitors: there was a gap in the layout of the monitors. after moving the screens border to border it worked.

xraandr output does not show the positioning:

xrandr -q
Screen 0: minimum 320 x 200, current 3696 x 1080, maximum 16384 x 16384
eDP connected primary 1440x900+0+0 (normal left inverted right x axis y axis) 302mm x 188mm
   2880x1800     60.00 +
   1920x1200     60.00  
   1920x1080     60.00  
   1600x1200     60.00  
   1680x1050     60.00  
   1280x1024     60.00  
   1440x900      60.00* 
   1280x800      60.00  
   1280x720      60.00  
   1024x768      60.00  
   800x600       60.00  
   640x480       60.00  
HDMI-A-0 connected 1920x1080+1776+0 (normal left inverted right x axis y axis) 521mm x 293mm
   1920x1080     60.00*+
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x960      60.00  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    66.67    59.94  
   720x400       70.08  
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-3 disconnected (normal left inverted right x axis y axis)
DisplayPort-4 disconnected (normal left inverted right x axis y axis)
DisplayPort-5 disconnected (normal left inverted right x axis y axis)