Multiple monitors acts weirdly under Plasma 6 Wayland

[MakwaWes]

Describe the bug
With a dual monitors setup, connecting to a Windows 10 client in fullscreen displays correctly on the monitor where the mouse is active and the second monitor flickers and shows the actual dual windows scaled to the single monitor. Hovering the mouse on the problematic monitor makes the issue alternate between the monitors.

Note that this issue doesn't happen under a Plasma 6 X11 session. Also doesn't happen under a Gnome Wayland session.

To Reproduce
Under a Plasma 6 Wayland session, connect to a Windows client with the multimon argument and more than 1 monitor.

Expected behavior
Expect to see the Windows desktop scaled correctly on all monitors like under a X11 session.

Screenshots
Below is a video since screenshots are not showing the issue.

Application details

• FreeRDP version 3.4.0 (n/a)
• xfreerdp3 /d:xx.xx /u:xxxxx /p:xxxx /cert:ignore /v:127.0.0.1 /audio-mode:2 -clipboard /multimon /prevent-session-lock
• Output of xfreerdp /buildconfig

Build configuration: BUILD_TESTING=OFF 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_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_BINARY_VERSIONING=ON WITH_CAIRO=OFF WITH_CCACHE=ON WITH_CHANNELS=ON 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_SDL_AVAILABLE=1 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_DSP_EXPERIMENTAL=OFF WITH_DSP_FFMPEG=ON WITH_DSP_FFMPEG_AVAILABLE=1 WITH_EVENTFD_READ_WRITE=1 WITH_FAAC=OFF WITH_FAAD2=OFF WITH_FFMPEG=ON WITH_FREERDP_DEPRECATED=OFF WITH_FREERDP_DEPRECATED_COMMANDLINE=OFF WITH_FUSE=ON WITH_GFX_H264=ON WITH_GPROF=OFF WITH_GSM=OFF WITH_ICU=ON WITH_INTERNAL_MD4=OFF WITH_INTERNAL_MD5=OFF WITH_INTERNAL_RC4=OFF WITH_IPP=OFF WITH_JPEG=ON 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_NEON=OFF WITH_OPENCL=OFF WITH_OPENH264=OFF WITH_OPENSC_PKCS11_LINKED=OFF WITH_OPENSSL=ON WITH_OPUS=OFF WITH_OSS=ON WITH_PCSC=ON WITH_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_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_SMARTCARD_EMULATE=ON WITH_SMARTCARD_INSPECT=OFF WITH_SMARTCARD_PCSC=ON WITH_SOXR=OFF WITH_SSE2=OFF WITH_SWSCALE=ON WITH_SYSTEMD=ON WITH_THIRD_PARTY=OFF WITH_UNICODE_BUILTIN=OFF WITH_URIPARSER=OFF WITH_VAAPI=OFF WITH_VAAPI_AVAILABLE=1 WITH_VALGRIND_MEMCHECK=OFF WITH_VALGRIND_MEMCHECK_AVAILABLE=1 WITH_VERBOSE_WINPR_ASSERT=ON WITH_VIDEO_FFMPEG=ON WITH_VIDEO_FFMPEG_AVAILABLE=1 WITH_WAYLAND=ON WITH_WEBVIEW=ON WITH_WEBVIEW_QT=OFF WITH_WINPR_DEPRECATED=OFF 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:          None
CFLAGS:              -march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions         -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security         -fstack-clash-protection -fcf-protection -g -ffile-prefix-map=/build/freerdp/src=/usr/src/debug/freerdp -flto=auto -Wall -Wpedantic -Wno-padded -Wno-cast-align -Wno-declaration-after-statement -fPIC -Wall -fvisibility=hidden -Wimplicit-function-declaration -Wredundant-decls -g -fno-omit-frame-pointer
Compiler:            GNU, 13.2.1
Target architecture: x64

• Windows 10

Environment (please complete the following information):

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

rdp.mp4

PS: Found a reddit with kind of the same issue : https://www.reddit.com/r/Fedora/comments/16ol9ln/rdp_multiple_monitors_on_wayland/

[akallabeth]

well, sounds like a KDE/plasma issue, keeping it open as reference for now.
hint: might help to open a but there too, maybe they have some input?

[danir-de]

Does this also happen when using sdl-freerdp ... instead of xfreerdp ...?
xfreerdp isn't quite suited for running on Wayland.

[akallabeth]

Does this also happen when using sdl-freerdp ... instead of xfreerdp ...? xfreerdp isn't quite suited for running on Wayland.

@danir-de still using xfreerdp quite heavily on wayland (XWayland) and don´t see a problem ;)
even draws more smooth than on original X11 settings.
but only regularily use dual monitor setups. (there have been quite a number of issues with kde and xfreerp/multimonitor a few years back, but they solved it in kwin as far as I remember)
maybe the same issue again with XWayland ?