10.10.3 Blank Screen after update from 10.10.2

kevinh2 · 05-07-2015, 09:33 PM

My system was working fine until an Apple update in late March or early April. Now my Displaylink monitor is blank. The screen maps in my system settings, and I can move my mouse to the screen (although I can't see the mouse)

I uninstalled and reinstalled the 2.4.1b software, but still not working.

My DisplayLink device works because I tested it on another of my MacBook Pros.

I attached the log file. Hopefully I used it correctly to gather the needed info.

thx

Carlo · 05-08-2015, 12:02 PM

Hi Kevin,

We have spotted a possible problem on this specific system: you have a kernel extension called vhhcd.kext that has created similar issues for a different user.

It seems to be connected with a SW called VirtualHere. Could you try uninstalling the vhhcd.kext kernel extension and check if the issue is still there?

Best regards,
Carlo

kevinh2 · 05-08-2015, 02:43 PM

Works after removing the kext file.

Now the question is whether the issue is DisplayLink or VirtualHere. Any thoughts? I will contact VirtualHere as well.

thx.

virtualhere · 05-08-2015, 10:21 PM

@Carlo: Im a developer from virtualhere. if you know the conflict with your driver let me know and ill make a fix to my driver if its something to do with vhhcd. I suspect you are polling the system for all USB Host Controllers and are only expecting Apple ones and your system then stops the polling...just a guess...Michael

Carlo · 05-09-2015, 08:15 AM

Quote:

Originally Posted by virtualhere

@Carlo: Im a developer from virtualhere. if you know the conflict with your driver let me know and ill make a fix to my driver if its something to do with vhhcd. I suspect you are polling the system for all USB Host Controllers and are only expecting Apple ones and your system then stops the polling...just a guess...Michael

Thank you Michael,
Yes that's the kind of issue we would have expected but it is much more weird than that! We'll contact you directly.

Cheers,
Carlo

virtualhere · 05-17-2015, 04:10 AM

OK this is now confirmed fixed in 2.9.5 of the virtualhere client.

Carlo · 05-18-2015, 08:18 AM

Thank you Michael,

This was a fast workaround!

Cheers,
Carlo

05-08-2015, 02:43 PM	#3
kevinh2 Junior Member Join Date: May 2015 Posts: 2	That fixed it Works after removing the kext file. Now the question is whether the issue is DisplayLink or VirtualHere. Any thoughts? I will contact VirtualHere as well. thx.

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05-08-2015, 12:02 PM	#2
Carlo Mac Team Join Date: Feb 2009 Posts: 606	Hi Kevin, We have spotted a possible problem on this specific system: you have a kernel extension called vhhcd.kext that has created similar issues for a different user. It seems to be connected with a SW called VirtualHere. Could you try uninstalling the vhhcd.kext kernel extension and check if the issue is still there? Best regards, Carlo

05-08-2015, 10:21 PM	#4
virtualhere Junior Member Join Date: May 2015 Posts: 2	@Carlo: Im a developer from virtualhere. if you know the conflict with your driver let me know and ill make a fix to my driver if its something to do with vhhcd. I suspect you are polling the system for all USB Host Controllers and are only expecting Apple ones and your system then stops the polling...just a guess...Michael

05-17-2015, 04:10 AM	#6
virtualhere Junior Member Join Date: May 2015 Posts: 2	OK this is now confirmed fixed in 2.9.5 of the virtualhere client.

05-18-2015, 08:18 AM	#7
Carlo Mac Team Join Date: Feb 2009 Posts: 606	Thank you Michael, This was a fast workaround! Cheers, Carlo