how to deal with two monitors? #4539

mastupristi · 2025-03-20T11:58:40Z

mastupristi
Mar 20, 2025

Hi,
I have a PC with two monitors. I start xpra in this way:

xpra shadow :0  --bind-tcp=0.0.0.0:14600,auth=file,filename=$HOME/.xpra/password.txt --html=on --daemon=no

and the logs tells me:

2025-03-20 12:49:10,339 xpra is ready.
2025-03-20 12:49:13,897 printer forwarding enabled using postscript and pdf
2025-03-20 12:49:14,154 31.1GB of system memory
2025-03-20 12:49:14,156 No OpenGL_accelerate module loaded: No module named 'OpenGL_accelerate'
2025-03-20 12:49:14,717 OpenGL is supported on display ':0'
2025-03-20 12:49:14,717  using 'Mesa Intel(R) UHD Graphics 630 (CFL GT2)' renderer
2025-03-20 12:49:19,561 python-zeroconf: '::' IPv6 loopback address is not supported
2025-03-20 12:49:19,561  unable to publish mDNS record for ssh connections
2025-03-20 12:49:26,376 xpra X11 shadow server version 6.2.5-r0
2025-03-20 12:49:26,376  uid=1000 (max), gid=1000 (max)
2025-03-20 12:49:26,377  running with pid 771670 on Linux Ubuntu 24.04 noble
2025-03-20 12:49:26,377  cpython 3.12
2025-03-20 12:49:26,378  on display 'X11 display :0' of size 3840x1080
2025-03-20 12:49:26,378  with 2 monitors:
2025-03-20 12:49:26,378   HDMI-1           1920x1080 at    0,0   
2025-03-20 12:49:26,378   HDMI-2           1920x1080 at 1920,0   

2025-03-20 12:56:25,565 New tcp connection received
2025-03-20 12:56:25,565  from '127.0.0.1:41694'
2025-03-20 12:56:25,566  on '0.0.0.0:14600'
2025-03-20 12:56:25,574 Authentication required by password file authenticator module
2025-03-20 12:56:25,574  sending challenge using 'hmac+sha512' digest over tcp connection
2025-03-20 12:56:26,101 Handshake complete; enabling connection
2025-03-20 12:56:26,111 Python/GTK3 Linux Ubuntu 24.10 oracular X11 client version 6.2
2025-03-20 12:56:26,111  connected as 'max'
2025-03-20 12:56:26,111  OpenGL is disabled
2025-03-20 12:56:26,116 shadow server: setting default keymap translation
2025-03-20 12:56:26,136  client root window size is 3840x2160
2025-03-20 12:56:26,927  automatic picture 
8000
encoding enabled, also available:
2025-03-20 12:56:26,927   h264, vp9, vp8, png, png/P, png/L, webp, avif, rgb24, rgb32, jpeg, jpega, av1, scroll
2025-03-20 12:56:26,957 found GPU accelerated encoders for: h264
2025-03-20 12:56:26,957 switching to 'stream' encoding for 'desktop' window 1
2025-03-20 12:56:26,957 using 'gstreamer' stream mode
2025-03-20 12:56:26,961 found GPU accelerated encoders for: h264
2025-03-20 12:56:26,962 switching to 'stream' encoding for 'desktop' window 2
2025-03-20 12:56:26,962 using 'gstreamer' stream mode
2025-03-20 12:56:27,002 client   1 @02.466 Xpra X11 shadow server version 6.2
2025-03-20 12:56:27,024 client   1 @02.466  remote desktop size is 3840x1080
2025-03-20 12:56:27,025 client   1 @02.466   :0.0 (1016x285 mm - DPI: 96x96) workarea: 3840x1059 at    0x21  
2025-03-20 12:56:27,025 client   1 @02.466     BNQ HDMI-1       1920x1080 at    0x0    (531x299 mm - DPI: 92x92) workarea: 1920x1059 at    0x21
2025-03-20 12:56:27,025 client   1 @02.466     BNQ HDMI-2       1920x1080 at 1920x0    (531x298 mm - DPI: 92x92) workarea: 1920x1080 at 1920x0
2025-03-20 12:56:27,105 client   1 @02.562 Attached to xpra server at tcp://max@localhost:14600/
2025-03-20 12:56:27,105 client   1 @02.562  (press Control-C to detach)
2025-03-20 12:56:27,475 shadow server: setting default keymap translation
2025-03-20 12:56:27,530 using monitor of default sink: USB Audio Device
/usr/lib/python3/dist-packages/xpra/server/shadow/gtk_shadow_server_base.py:341: DeprecationWarning: Gdk.Window.get_pointer is deprecated
  return self.root.get_pointer()[-3:-1]
2025-03-20 12:56:28,165 audio capture using 'opus' audio codec
2025-03-20 12:56:28,994 client   1 @04.441 running, 2 windows
2025-03-20 12:56:29,071 client   1 @04.532 Warning: image bigger than expected
2025-03-20 12:56:29,071 client   1 @04.533  3840x1080 instead of 1920x1080
2025-03-20 12:56:29,203 client   1 @04.625 Warning: image bigger than expected
2025-03-20 12:56:29,203 client   1 @04.625  3840x1080 instead of 1920x1080
2025-03-20 12:56:29,245 client   1 @04.667 Warning: image bigger than expected
2025-03-20 12:56:29,245 client   1 @04.667  3840x1080 instead of 1920x1080
2025-03-20 12:56:29,245 client   1 @04.700 Warning: image bigger than expected
2025-03-20 12:56:29,245 client   1 @04.700  3840x1080 instead of 1920x1080
2025-03-20 12:56:29,298 client   1 @04.726 Warning: image bigger than expecte

So it correctly detects 2 monitors and the resolution.

on the client side I run:

max@jarvis:~$ xpra attach tcp://max:*******@localhost:14600 --opengl=no --desktop-fullscreen=no --desktop-scaling=0

2025-03-20 12:44:49,426 Xpra GTK3 X11 client version 6.2.5-r0
2025-03-20 12:44:49,465  running on Linux Ubuntu 24.10 oracular
2025-03-20 12:44:49,465  cpython 3.12
2025-03-20 12:44:49,466  window manager is 'Xfwm4'
2025-03-20 12:44:49,854 GStreamer version 1.24.8
2025-03-20 12:44:49,894 created unix domain sockets:
2025-03-20 12:44:49,894  '/run/user/1000/xpra/clients/jarvis-27499'
2025-03-20 12:44:50,361 Using existing mmap file '/run/user/1000/xpra/xpra.p4k1739z.mmap': 512MB
2025-03-20 12:44:50,545  keyboard settings: rules=evdev, model=pc105, layout=us
2025-03-20 12:44:50,761  desktop size is 3840x2160:
2025-03-20 12:44:50,761   :0.0 (702x392 mm - DPI: 139x140) workarea: 3840x2127 at    0x33  
2025-03-20 12:44:50,761     SAM HDMI-0       (697x392 mm - DPI: 140x140)
2025-03-20 12:44:51,092 enabled remote logging
2025-03-20 12:44:51,092 Xpra X11 shadow server version 6.2
2025-03-20 12:44:51,093  remote desktop size is 3840x1080
2025-03-20 12:44:51,093   :0.0 (1016x285 mm - DPI: 96x96) workarea: 3840x1059 at    0x21  
2025-03-20 12:44:51,093     BNQ HDMI-1       1920x1080 at    0x0    (531x299 mm - DPI: 92x92) workarea: 1920x1059 at    0x21
2025-03-20 12:44:51,093     BNQ HDMI-2       1920x1080 at 1920x0    (531x298 mm - DPI: 92x92) workarea: 1920x1080 at 1920x0
2025-03-20 12:44:51,188 Attached to xpra server at tcp://max@localhost:14600/
2025-03-20 12:44:51,188  (press Control-C to detach)

2025-03-20 12:44:51,881 running, 2 windows
2025-03-20 12:44:51,977 Warning: image bigger than expected
2025-03-20 12:44:51,977  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,076 Warning: image bigger than expected
2025-03-20 12:44:52,076  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,110 Warning: image bigger than expected
2025-03-20 12:44:52,110  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,138 Warning: image bigger than expected
2025-03-20 12:44:52,138  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,164 Warning: image bigger than expected
2025-03-20 12:44:52,164  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,191 Warning: image bigger than expected
2025-03-20 12:44:52,191  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,216 Warning: image bigger than expected
2025-03-20 12:44:52,217  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,243 Warning: image bigger than expected
2025-03-20 12:44:52,244  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,269 Warning: image bigger than expected
2025-03-20 12:44:52,269  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,296 Warning: image bigger than expected
2025-03-20 12:44:52,296  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,322 Warning: image bigger than expected
2025-03-20 12:44:52,322  3840x1080 instead of 1920x1080
2025-03-20 12:44:52,349 Warning: image bigger than expected
2025-03-20 12:44:52,349  3840x1080 instead of 1920x1080

once again, 2 monitor are detected, and 2 windows are opened, one called HDMI-1 and the other HDMI-2.
But both show me the same things, only one is "interactive".

How to make the second windows to show the right portion of image, and be responsive to the right events?

best regards
Max

Simba98 · 2025-04-17T11:02:05Z

Simba98
Apr 17, 2025

That's weird, I have three monitors and Xpra works well.
Can you specify your settings? Client/Server OS, Xpra versions?

12 replies

Simba98 Apr 18, 2025

Hi @mastupristi Max,

https://github.com/Xpra-org/xpra/blob/master/docs/Usage/Shadow.md

As you have SSH access to the server, and the server also Xpra installed.
Would you try on your client side?

xpra shadow ssh://max@10.xxx.xxx.xxx/0

mastupristi Apr 18, 2025
Author

Hi @Simba98

Would you try on your client side?
xpra shadow ssh://max@10.xxx.xxx.xxx/0 

so on the server there is no xpra running, and on the client I see this:


2025-04-18 13:07:29,993 Xpra GTK3 X11 client version 6.2.5-r0
2025-04-18 13:07:30,034  running on Linux Ubuntu 24.10 oracular
2025-04-18 13:07:30,034  cpython 3.12
2025-04-18 13:07:30,034  window manager is 'Xfwm4'
2025-04-18 13:07:31,336 GStreamer version 1.24.8
2025-04-18 13:07:31,380 created unix domain sockets:
2025-04-18 13:07:31,380  '/run/user/1000/xpra/clients/jarvis-14142'
2025-04-18 13:07:31,845 No OpenGL_accelerate module loaded: No module named 'OpenGL_accelerate'
2025-04-18 13:07:32,427 OpenGL 3.2 enabled on 'NVIDIA GeForce RTX 2070/PCIe/SSE2'
2025-04-18 13:07:32,427  using native glx backend
2025-04-18 13:07:32,427  zerocopy is not available
2025-04-18 13:07:32,661 Connected (version 2.0, client OpenSSH_9.6p1)
2025-04-18 13:07:39,610 Authentication (password) successful!
2025-04-18 13:07:40,417 ssh server OS is 'linux-gnu'
2025-04-18 13:07:41,388 paramiko SSH agent forwarding enabled
2025-04-18 13:07:41,598  SSH: 'could not detect any live displays'
2025-04-18 13:07:41,601 Using existing mmap file '/run/user/1000/xpra/xpra.s5glf1a7.mmap': 512MB
2025-04-18 13:07:41,614  keyboard settings: rules=evdev, model=pc105, layout=us
2025-04-18 13:07:41,674 SSH EOF on stderr of run-xpra
2025-04-18 13:07:41,875  desktop size is 3840x2160:
2025-04-18 13:07:41,875   :0.0 (702x392 mm - DPI: 139x140) workarea: 3840x2127 at    0x33  
2025-04-18 13:07:41,876     SAM HDMI-0       (697x392 mm - DPI: 140x140)
2025-04-18 13:07:42,016 Error: failed to receive anything, not an xpra server?
2025-04-18 13:07:42,016   could also be the wrong protocol, username, password or port
2025-04-18 13:07:42,016   or the session was not found
2025-04-18 13:07:42,016 Connection failed
2025-04-18 13:07:42,122 removing unix domain socket '/run/user/1000/xpra/clients/jarvis-14142'

it simply doesn't work

best regards
Max

totaam Apr 18, 2025
Maintainer

@mastupristi that's quite odd, because running xpra shadow ssh://.. will just run xpra shadow for you on the remote host.

SSH: 'could not detect any live displays'

Maybe add -d ssh to see what command it's trying to run.
I can't imagine why xpra shadow would find the display and xpra shadow ssh://.. would not

mastupristi Apr 18, 2025
Author

Hi @totaam

xpra.txt file contains the trace of the command

xpra shadow ssh://max:xxxxxxxx@10.xxx.xxx.xxx -d

I have tried to understand something without succeeding. I hope you have better luck

best regards
Max

8000

mastupristi Apr 18, 2025
Author

Hi @totaam

In any case, there are a lot of details missing - please see: https://github.com/Xpra-org/xpra/wiki/Reporting-Bugs

Right now I don't think it's a bug in xpra, but an error on my part in the parameters or other boundary things

best regards
Max

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