[GH-ISSUE #36] Thunderbolt dock and stuttery mouse pointer movement #36

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opened 2026-05-05 04:47:54 -06:00 by gitea-mirror · 4 comments

gitea-mirror commented

2026-05-05 04:47:54 -06:00

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Originally created by @brechtm on GitHub (Jun 6, 2018).
Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/36

Originally assigned to: @the0neyouseek on GitHub.

After starting MonitorControl, my mouse pointer movement is no longer smooth. Moving a window around is also much less smooth (you could say it's about 10 fps). This is with a Samsung SyncMaster 226BW (DVI) plugged into the HDMI port of a Caldigit Thunderbolt Station 2 and a Mid-2014 15-inch MacBook Pro.

When I directly connect the monitor to my MacBoo, there is no noticeable change in pointer smoothness!

I can control the brightness of my external monitor using Monitor Control in both cases. Also, Activity Monitor shows MonitorControl using around 10% CPU time constantly (with and without dock). I'll open a separate ticket for this.

Originally created by @brechtm on GitHub (Jun 6, 2018). Original GitHub issue: https://github.com/MonitorControl/MonitorControl/issues/36 Originally assigned to: @the0neyouseek on GitHub. After starting MonitorControl, my mouse pointer movement is no longer smooth. Moving a window around is also much less smooth (you could say it's about 10 fps). This is with a Samsung SyncMaster 226BW (DVI) plugged into the HDMI port of a Caldigit Thunderbolt Station 2 and a Mid-2014 15-inch MacBook Pro. When I directly connect the monitor to my MacBoo, there is no noticeable change in pointer smoothness! I can control the brightness of my external monitor using Monitor Control in both cases. Also, Activity Monitor shows MonitorControl using around 10% CPU time constantly (with and without dock). I'll open a separate ticket for this.

gitea-mirror

2026-05-05 04:47:54 -06:00

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gitea-mirror commented

2026-05-05 04:47:59 -06:00

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@the0neyouseek commented on GitHub (Jun 21, 2018):

Hi @brechtm,

I think your issue is a duplicate of #37. I'll keep this open for now if they appear to be separate issue.
I work full time so I don't have much time to work on this but I'll take a look asap.

Have a nice day

@the0neyouseek commented on GitHub (Jun 21, 2018): Hi @brechtm, I think your issue is a duplicate of #37. I'll keep this open for now if they appear to be separate issue. I work full time so I don't have much time to work on this but I'll take a look asap. Have a nice day

gitea-mirror commented

2026-05-05 04:48:01 -06:00

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@brechtm commented on GitHub (Jun 22, 2018):

I also see high CPU usage when the monitor is connected directly to the MacBook (without the Thunderbolt dock). Therefore, I believe these to be two separate issues.

Please only look into this when you feel like it. Open source should be fun :-) I can imagine this one affecting few people and being very tricky to debug.

@brechtm commented on GitHub (Jun 22, 2018): I also see high CPU usage when the monitor is connected directly to the MacBook (without the Thunderbolt dock). Therefore, I believe these to be two separate issues. Please only look into this when you feel like it. Open source should be fun :-) I can imagine this one affecting few people and being very tricky to debug.

gitea-mirror commented

2026-05-05 04:48:03 -06:00

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@krystof-k commented on GitHub (Aug 6, 2018):

I'm probably having a similar issue (High Sierra). After connecting two displays (one DVI, one HDMI, both Dell 2410), the CPU usages goes almost 100% so that it's almost impossible to control the computer (the mouse cursor is extremely laggy). When I unplug the displays, everything is fine (I don't even have to close the app). I'd be happy to provide any support for debugging.

I was using this before, also based on ddcctl, and it worked fine.

@krystof-k commented on GitHub (Aug 6, 2018): I'm probably having a similar issue (High Sierra). After connecting two displays (one DVI, one HDMI, both Dell 2410), the CPU usages goes almost 100% so that it's almost impossible to control the computer (the mouse cursor is extremely laggy). When I unplug the displays, everything is fine (I don't even have to close the app). I'd be happy to provide any support for debugging. I was using [this](https://github.com/Bensge/NativeDisplayBrightness) before, also based on ddcctl, and it worked fine.

gitea-mirror commented

2026-05-05 04:48:07 -06:00

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@the0neyouseek commented on GitHub (May 23, 2019):

Closed, please see #37 for further discussions

@the0neyouseek commented on GitHub (May 23, 2019): Closed, please see #37 for further discussions