Synergy-core: Make scroll threshold configurable

[nbolton]

Imported issue:

• Author: Juho Malmi
• Date: 2013-09-01 12:56:28
• Legacy ID: 3727

Steps to reproduce:

1. Start server on win7
2. Start client on Ubuntu 13.04

Expected: Mouse scroll works likewise on client as it does on server.

Actual: Mouse scroll doesn't work on client. Following log outputs are generated on client when scrolling is attempted:

WARNING: Wheel scroll delta (28) smaller than threshold (120)
/build/synergy-a5y_Eu/synergy-1.4.12/src/lib/platform/CXWindowsScreen.cpp,889

Versions and operating systems:

Server: Synergy 1.4.12 on Windows 7 Ultimate SP1
Client: Synergy 1.4.12 on Ubuntu 13.04 Linux

Temporary workarounds:

Start client from command line with yscroll option set to correct value. E.g.

synergyc --yscroll 28 [server address]

Similar bugs:

Bug #37 - Mouse scroll does not work on client screen (Windows XP)

Additional comments:

Bug #37 has this issue described in the thread. However, Bug #37 is currently classified as an issue between two windows xp machines and it is also no longer clear if that issue is caused by the yscroll value.

[nbolton]

• Author: Marcel Schnirring
• Date: 2014-03-29 11:24:13

Same problem here with Ubuntu 13.10 client!

[nbolton]

• Author: emanuele valabrega
• Date: 2014-03-31 09:36:02

I've the same problem.
The workaround described seems to work fine, but does something exist to set the scroll parameter permanently?

[nbolton]

• Author: Sam M.
• Date: 2014-08-05 00:16:34

I'm using v1.50 on Fedora 20 as the client with a OSX system as the server and am getting this exact type of error as well.

WARNING: Wheel scroll delta (60) smaller than threshold (120)

How can I override this through the official package's applet? Is that possible or do I have to resort to killing/quitting the official applet and running this via the cli?

[nbolton]

• Author: Sam M.
• Date: 2014-08-05 15:42:57

I worked around the issue as follows. I didn't want to give up using the synergy applet to start/stop + manage everything so I did the following.

1. move /usr/bin/synergyc to /usr/bin/synergyc.orig
2. created a shell script in it's place, /usr/bin/synergyc

```
#!/bin/bash

/usr/bin/synergyc.orig --yscroll 30 $*
```

1. made it executable.

chmod +x /usr/bin/synergyc

1. restarted synergy

This is a hack to fix the issue, the more appropriate solution would be to either allow the setting of yscroll via synergy or to adjust/scale the default (if any) that's being communicated from the synergy server to the synergy clients.

[Naatan]

Suggested workaround does nothing for me, no matter the value of --yscroll when I use my scroll wheel it scrolls the exact same amount.

[shhoppe]

Actually, I think your 'hack' is really simple and elegant. I more or less copied it verbatim and now I can move on to other things. Thanks!

[GameScripting]

Does still not work for me as a workaround, too. I am using ubuntu 15.10 as client and windows 10 as server.
The scroll data warning does not apprear in the logs on my system :(

[mengesb]

I'm getting a similar message:

[2016-01-13T09:30:22] WARNING: Wheel scroll delta (24) smaller than threshold (120)

MacOSX server, Ubuntu 14.04 LTS client
v1.7.6-rc3-51705f7

[ghost]

same here, regardless of what I set yscroll to, the scrolling remains the same.

im using mac os el capitan on the server, sierra on the client with magic trackpad.

setting accessibility > trackpad scrolling speed made a tiny difference, but the scrolling is still too sensitive on the client.

[zelivans]

The workaround definitely works, please implement this :+1:

[doublerebel]

Glad to finally find this! Fixes a long-standing issue with delayed scrolling from MacOS server, Linux client using Kensington Expert Mouse. Hack workaround is still necessary with Synergy 2, although the filename has changed and the --client flag must be the first argument:

$ cat /usr/bin/synergy-core
#!/bin/bash
/usr/bin/synergy-core.orig --client --yscroll 76 $*

EDIT 16 Feb:
synergy-core really seems to prefer -f flag for "run in the foreground", directly after --client or I get endless crashing loops of this:

[ Router  ] [2018-02-16T14:32:54] debug: Error reading from core client: End of file
[ Router  ] [2018-02-16T14:32:54] debug: Terminating core client read loop

So the final working script is:

#!/bin/bash
/usr/bin/synergy-core.orig --client -f --yscroll 76 $*

[dogweather]

Experiencing the same thing - makes it unusable. Using the current version 1 download from the site.

Will try the hack.

WARNING: Wheel scroll delta (37) smaller than threshold (120)

[trollfred]

same there Mac + Fedora, --yscroll 76 works perfectly, please add this config to the gui eventually