[winswitch] xpra session to other account on localhost

[Marc Haber]

Hi,

I would like to do an xpra connection to an xpra server running under a
different account on the same host. I am running Debian unstable and
have xpra 2.4.2. The box is a strong Six-Core machine with plenty of
free RAM and a fast SSD.

Running a Firefox browser over this connection is quite slow. I have to
wait multiple hundreds of milliseconds before the reaction to a click
can be seen. Scrolling a window takes like ten seconds until the picture
is completely re-drawn at full resolution. Is that the expected behavior
on a local host with no network involved, plenty of CPU and plenty of
RAM?

I notice that the server complains twice on startup:
2018-12-08 20:19:08,741 cannot use uinput for virtual devices:
2018-12-08 20:19:08,741  [Errno 13] Failed to open the uinput device: Permission denied
WARNING: no 'numpy' module, HyBi protocol will be slower

python-numpy 1.15.4-2 is installed, and the /dev/uinput device is
root:root 600, so it is not accessible by a regular user. Should I make
/dev/uinput root:uinput 660 and put myself into the uinput group? Or is
that a security disk? What is the recommended way to handle uinput? I
don't even know what that is...

Here is what the server logs:
marc at fan:~$ xpra start --daemon=no --speaker=off --webcam=no --mdns=no --pulseaudio=no --start=konsole :100
2018-12-08 20:20:27,121 cannot use uinput for virtual devices:
2018-12-08 20:20:27,121  [Errno 13] Failed to open the uinput device: Permission denied

X.Org X Server 1.20.3
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.9.0-8-amd64 x86_64 Debian
Current Operating System: Linux fan 4.18.0-3-amd64 #1 SMP Debian 4.18.20-2 (2018-11-23) x86_64
Kernel command line: BOOT_IMAGE=/vmlinuz-4.18.0-3-amd64 root=/dev/mapper/root ro splash console=ttyS0,57600n8 quiet
Build Date: 25 October 2018  06:15:23PM
xorg-server 2:1.20.3-1 (https://www.debian.org/support)
Current version of pixman: 0.34.0
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(++) Log file: "/run/user/1002/xpra/Xorg.:100.log", Time: Sat Dec  8 20:20:27 2018
(++) Using config file: "/etc/xpra/xorg.conf"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
2018-12-08 20:20:28,913 created unix domain socket: /run/user/1002/xpra/fan-100
2018-12-08 20:20:28,913 created unix domain socket: /run/xpra/fan-100
2018-12-08 20:20:29,096 pointer device emulation using XTest
2018-12-08 20:20:31,107  OpenGL is supported on this display
WARNING: no 'numpy' module, HyBi protocol will be slower
2018-12-08 20:20:31,186 serving html content from: /usr/share/xpra/www
2018-12-08 20:20:31,516 D-Bus notification forwarding is available
2018-12-08 20:20:31,691 xpra X11 version 2.4.2-r21077M 64-bit
2018-12-08 20:20:31,691  uid=1002 (marc), gid=1002 (marc)
2018-12-08 20:20:31,691  running with pid 4804 on Linux Debian unstable sid
2018-12-08 20:20:31,692  connected to X11 display :100 with 24 bit colors
2018-12-08 20:20:31,896 xpra is ready.
2018-12-08 20:20:39,158 printer forwarding enabled using postscript and pdf
2018-12-08 20:20:39,189 15.7GB of system memory
(after client connection):
2018-12-08 20:23:56,917 New unix-domain connection received on /run/user/1002/xpra/fan-100
2018-12-08 20:23:56,924 Handshake complete; enabling connection
2018-12-08 20:23:56,934  automatic picture encoding enabled, also available:
2018-12-08 20:23:56,934   h264, vp9, vp8, png, png/P, png/L, webp, rgb24, rgb32, jpeg, h265, mpeg1, mpeg2
2018-12-08 20:23:56,935 Python/Gtk2 Linux Debian unstable sid x11 client version 2.4.2-r21077 64-bit
2018-12-08 20:23:56,935  connected from 'fan' as 'marc' - 'Marc Haber'
2018-12-08 20:23:57,109 setting key repeat rate from client: 600ms delay / 40ms interval
2018-12-08 20:23:57,111 setting keymap: rules=evdev, model=pc101, layout=de
2018-12-08 20:23:57,161 setting keyboard layout to 'de'
2018-12-08 20:23:57,226  client root window size is 4352x1728 with 1 display:
2018-12-08 20:23:57,226   :0.0 (1439x571 mm - DPI: 76x76) workarea: 4352x1690
2018-12-08 20:23:57,226     monitor 1 3072x1728 (941x529 mm - DPI: 82x82)
2018-12-08 20:23:57,227     monitor 2 1280x960 at 3072x0 (408x306 mm - DPI: 79x79)
2018-12-08 20:23:57,313 server virtual display now set to 4352x2048 (best match for 4352x1728)
2018-12-08 20:23:57,355 client @09.168 Xpra X11 server version 2.4.2-r21077 64-bit
2018-12-08 20:23:57,356 client @09.169  running on Linux Debian unstable sid
2018-12-08 20:23:57,360 DPI set to 51 x 48 (wanted 54 x 77)
2018-12-08 20:23:57,361  you may experience scaling problems, such as huge or small fonts, etc
2018-12-08 20:23:57,361  to fix this issue, try the dpi switch, or use a patched Xorg dummy driver
2018-12-08 20:23:57,417 client @09.176 Attached to localhost:22 via ssh
2018-12-08 20:23:57,417 client @09.177  (press Control-C to detach)
2018-12-08 20:23:57,510 client @09.284 server does not support xi input devices
2018-12-08 20:23:57,513 client @09.284  server uses: xtest
2018-12-08 20:23:57,706 New unix-domain connection received on /run/user/1002/xpra/fan-100
2018-12-08 20:23:57,708 New unix-domain connection received on /run/xpra/fan-100
2018-12-08 20:24:06,527 Warning: limited clipboard support for CLIPBOARD
2018-12-08 20:24:06,528  virtual method Gtk.Widget.selection_get not implemented

And here is what the client logs:
[19/5150]mh at fan:~ $ xpra attach ssh:marc at localhost:100
2018-12-08 20:23:48,174 Xpra gtk2 client version 2.4.2-r21077M 64-bit
2018-12-08 20:23:48,175  running on Linux Debian unstable sid
2018-12-08 20:23:48,176  window manager is 'KWin'
2018-12-08 20:23:51,994 GStreamer version 1.14.4 for Python 2.7.15 64-bit
2018-12-08 20:23:52,191 No OpenGL_accelerate module loaded: No module named OpenGL_accelerate
2018-12-08 20:23:52,554 OpenGL enabled with Radeon RX 580 Series (POLARIS10, DRM 3.26.0, 4.18.0-3-amd64, LLVM 7.0.1)
2018-12-08 20:23:52,671 Connected (version 2.0, client OpenSSH_7.9p1)
2018-12-08 20:23:54,937 Authentication (publickey) successful!
2018-12-08 20:23:55,045  keyboard settings: rules=evdev, model=pc101, layout=de
2018-12-08 20:23:55,067  desktop size is 5440x2160 with 1 screen:
2018-12-08 20:23:55,067   :0.0 (1439x571 mm - DPI: 96x96) workarea: 5440x2112
2018-12-08 20:23:55,067     monitor 1 3840x2160 (941x529 mm - DPI: 103x103)
2018-12-08 20:23:55,067     monitor 2 1600x1200 at 3840x0 (408x306 mm - DPI: 99x99)
2018-12-08 20:23:55,067  upscaled by 125%, virtual screen size: 4352x1728
2018-12-08 20:23:55,068   :0.0 (1439x571 mm - DPI: 76x76) workarea: 4352x1690
2018-12-08 20:23:55,068     monitor 1 3072x1728 (941x529 mm - DPI: 82x82)
2018-12-08 20:23:55,068     monitor 2 1280x960 at 3072x0 (408x306 mm - DPI: 79x79)
2018-12-08 20:23:57,343 enabled remote logging
2018-12-08 20:23:57,343 Xpra X11 server version 2.4.2-r21077 64-bit
2018-12-08 20:23:57,344  running on Linux Debian unstable sid
2018-12-08 20:23:57,351 Attached to localhost:22 via ssh
2018-12-08 20:23:57,352  (press Control-C to detach)

2018-12-08 20:23:57,459 server does not support xi input devices
2018-12-08 20:23:57,460  server uses: xtest

In the panel applet, I have set Picture => Fixed speed to "Lowest
latency". The session information claims that I have 60 ms frame total
latency, but it feels like a multiple of that. Any networked RDP session
to a Windows machine feels much faster.

This is not fun at all. What am I doing wrong?

Greetings
Marc

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