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| Subject : |
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US221A/421A can't auto switch under MAc OS X 10.10 |
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| Description : |
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After installation the software, will not auto switch, the US221A/421A icon
is grayed out, it seems like a connection fail.
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| Solution : |
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This issue can be solved by changing Mac OS X 10.10 settings.
Please perform the following steps to change settings.
Step 1: Enter OS X utilities by holding Cmd+R during boot
Step 2: Open a Terminal from the utilities menu bar
Step 3: Run this command: nvram boot-args
Does it say “kext-dev-mode=1″? If so, you can skip to Step 5.
If it says “error getting variable”, continue with these steps:
Step 4: Run this command: nvram boot-args=kext-dev-mode=1
Step 5: Reboot the system normally
It should work fine after reboot.
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