Mouse on client moves 2x as fast up and left

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Re: mouse on client moves 2x as fast up and left

Postby Eric Schlegel » Fri Nov 04, 2016 1:03 pm

After some research, it looks like there is an issue related to gaming mice and Sierra.

I did find a fix for my situation, although I don't know how temporary it is. I restarted the Mac (server) without the mouse plugged in. After the reboot, I plugged the same mouse back in and started Synergy again. The mouse speed on the Win7 machine (client) has returned to normal speed and seems to be tracking in the right direction.

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Re: mouse on client moves 2x as fast up and left

Postby Fred Anderson » Mon Nov 07, 2016 7:23 pm

Hi Eric, this did not work for me. Has anyone else had success with this?
At this point I have assume that they will fix this. Because Sierra is picking up steam and the app is almost useless at this point. I have reverted to using the trackpad mouse on the client when I go over there.

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Re: mouse on client moves 2x as fast up and left

Postby Fred Anderson » Thu Nov 10, 2016 5:29 am

It's been a couple weeks, I am going to purchase priority support and see if that gets me anywhere.
Fred

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Re: mouse on client moves 2x as fast up and left

Postby Colin Miller » Mon Nov 14, 2016 2:33 pm

Could you let us know what the results are if you find anything out?

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Re: mouse on client moves 2x as fast up and left

Postby Fred Anderson » Tue Nov 15, 2016 5:18 am

Of course.

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Re: mouse on client moves 2x as fast up and left

Postby Fred Anderson » Wed Nov 16, 2016 6:21 am

Message from Tech Support:
"I'm sorry to say, but this a new bug caused by macOS Sierra. We're working on a fix for this now, and in a few weeks we'll release a new version which should solve your problem."

I will wait it out. When this program works, it is perfect for the work that I do. Sadly, when it is not working it is almost like a form of torture.

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Joined: Wed Nov 23, 2016 2:59 am

Re: mouse on client moves 2x as fast up and left

Postby Asa Durkee » Thu Dec 15, 2016 3:18 am

tl;dr: seems like the server is sending more mouse updates in left and up directions.

Just another mostly happy user. Problem still occurs with "official" 1.8.6 build (1.8.6-stable-2ab21aa, built Dec 12). Server: macOS Sierra 10.12.1. Client: Windows 10 Pro x64.
Simplest way to reproduce is to move pointer to Windows machine and then move the mouse in small circles - pointer drifts up and to the left.
Attempted troubleshooting:
* This "up and to the left" drift occurs regardless of the client/server screen orientation in server settings.
* Enabling "use relative mouse moves" on server has no effect on the drifting behavior.
* Disabling SSL on both machines has no effect.
* Increased loglevel to DEBUG2 on server. Noticed that in the log, mouse movements to the left and up arrive in "bursts" of up to 8 coordinate updates, whereas right and down mouse movements are only one or two coordinate updates, viz.
Example left/up movement, logged:
[2016-12-15T01:59:33] DEBUG2: no-op from
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+720
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+720
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+720
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+720
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+720
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+720
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+720
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+720
[2016-12-15T01:59:33] DEBUG2: mouse move +1280,+721
[2016-12-15T01:59:33] DEBUG2: onMouseMoveSecondary +0,+1

Example right/down movement, logged:
[2016-12-15T02:00:01] DEBUG2: no-op from
[2016-12-15T02:00:01] DEBUG2: mouse move +1279,+720
[2016-12-15T02:00:01] DEBUG2: onMouseMoveSecondary -1,+0

On Windows client, mouse moves are "aligned" as single coordinate updates regardless of movement direction:
[2016-12-15T02:08:38] DEBUG2: readf: read 2 byte integer: 919 (0x397)
[2016-12-15T02:08:38] DEBUG2: recv mouse move 843,919
[2016-12-15T02:08:38] DEBUG2: writef(CNOP)

Based on the above, it looks like the server is sending an increased frequency of updates in the left/up direction, causing the "drift" behavior. Haven't examined the source but one quick way to fix might be to limit the server to use the same update frequency regardless of mouse movement direction (making it look more like the example right/down movement example above). This would be potentially at the expense of higher update frequency.
Last edited by Asa Durkee on Thu Dec 15, 2016 9:05 pm, edited 1 time in total.

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Re: mouse on client moves 2x as fast up and left

Postby Fred Anderson » Thu Dec 15, 2016 8:21 am

@Asa Thank you for this info I hope the dev team can make use of it. I am really surprised that Symless team has not resolved this issue. I was hopeful when I looked at the nightlies and saw there was a beta for 2.0. I gave it a try and the problem is still there.

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Joined: Sat Dec 17, 2016 6:47 pm

Re: mouse on client moves 2x as fast up and left

Postby Aaron Moore » Sat Dec 17, 2016 6:50 pm

Anyone find any solutions to this problem? I just paid for synergy thinking it was some settings thing but I guess not. Seems like this issue was reported over a month ago. Any feedback from the devs on if this is a priority?

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Joined: Wed Jan 11, 2017 6:25 pm

Re: mouse on client moves 2x as fast up and left

Postby Cooper Matson » Wed Jan 11, 2017 6:26 pm

On the GitHub page it is a priority 1 bug. But has been for over two months. Who knows if that means anything to the devs or if they have any plans to ever fix it. https://github.com/symless/synergy/issues/5648 .

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