10-01-2014, 03:27 PM | #1 |
Junior Member
Join Date: Nov 2013
Posts: 3
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AOC E2251FWU USB monitor flashing
I have a mid-2013 MacBook Air running Mountain Lion. Upgraded to Mavericks, lost multi-monitor support, rolled back to Mountain Lion.
I can successfully attach to my Toshiba Dynadock 3.0 with dual monitors via a USB cable, Lenovo LT1421 portable USB monitor as an extended desktop, and Samsung LCD TV as a mirrored display. I used to be able to use the AOC E2251FWU portable monitor. Starting around mid-summer, when I connect, the MBA screen and the portable monitor turn on and off without success. I think this was due to an Apple software or firmware update. I have checked the power settings, and tried setting to never turn off the screen, no change. I tried rolling back the DisplayLink driver from 2.2 to 2.1, no change. I tried plugging the monitor into both USB ports, no change. I tried from BootCamp with Windows 7, no change. I tried on my old Toshiba laptop running Windows 7, and it works no problem. What can I try next? Last edited by scottm; 10-01-2014 at 03:46 PM. |
10-01-2014, 05:36 PM | #2 |
Mac Team
Join Date: Feb 2009
Posts: 606
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I'd try an externally powered hub, or you could try using the USB Y cable connecting the "power only" end to a different power source (not on the same laptop).
Given that the other devices work OK I'd think about a degradation of the electronics more than a SW issue. Cheers, Carlo |
10-02-2014, 04:32 PM | #3 |
Junior Member
Join Date: Nov 2013
Posts: 3
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Thanks Carlo. I'll try the powered USB hub. The monitor has a single USB input, so there isn't a "power only" option for that.
I also found an OS X USB Debug Kit here that I'll try: https://developer.apple.com/hardwaredrivers/ |
10-07-2014, 03:44 PM | #4 |
Junior Member
Join Date: Nov 2013
Posts: 3
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The external powered USB hub worked flawlessly with the AOC monitor. The debug logs contain no reference to DisplayLink. So I think that the driver is not the problem.
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