Desktop Problems with ASUS USB-AC56 Wireless Adapter

[thunderpanda]

In short, my wireless adapter is not working on my desktop, on a wifi network that not a single other device has had any problems with. Additionally, this specific adapter was tested on another computer and worked perfectly.

System specs:
- custom desktop
- Windows 7 64bit.
- Gigabyte P55A-UD6 intel Motherboard
- Intel 875k i7 processor
- Corsair 750w PSU

Wifi Router (I'm positive this is not the issue as other wifi networks are affected)
- Linksys AC1900

Wireless Adapter: ASUS USB-AC56
- Works fine on my Windows XP Lenovo T60 Laptop

Adapter Driver (According to device manager): Version 1026.6.1217.2013 from Realtek Semiconductor Corp.


Symptoms
- Cannot connect to most wireless networks.
- When connecting to primary network, it tries for a while, then says maybe the password is wrong (Which seems to be what it says no matter what when it fails)
- Password is definitely correct (Quadruple checked, and used other devices successfully after re-entering the same password)
- Other devices including phones and laptops connect perfectly, every time to this network
- Even a laptop, literally using this exact adapter, worked perfectly on this network
- I did successfully get it to connect to my Galaxy S4 phone being used as a hotspot, and that for some reason worked, though they were inches from each other.

Other important, strange symptoms:
- Computer will not shut down with adapter plugged in. The moment I unplug the adapter, it finishes shutting down
- Same goes for starting up. Screen goes blank after windows loading screen unless I unplug it
- Can't finish uninstalling drivers for the adapter, while the adapter is plugged in. The moment I unplug, it finishes.
- USB flash drives don't appear, or appear VERY slowly when plugged in, if the adapter is also plugged in. Again, the moment I unplug it they work fine.
- A bunch of other random system related things don't work until I unplug the adapter

So I don't know what's up... Seems to me to be some kind of conflict, but I can't figure out what it would be. It is very very frustrating though... I have this new router and it works amazingly and every device connects perfectly to it, except my work desktop, the only one even using an adapter that can fully utilize the power of the wifi.

 

[thunderpanda]

Update:

The wireless is still working great, but just for reference: I was having problems when putting my computer in standby after the BIOS update. I would have to cut power a bunch of times and reboot repeatedly to get back in Windows. As a temporary solution I just never turned my computer off or put it in standby.

That was with BIOS version 12c, which is evidently a beta. Today I finally got around to downgrading to version 11, and all my problems appear to have been solved. No more issues with standby (actually it comes out of it faster than it ever has!) and everything else is working too. So, I would not recommend version 12c!

 

[Darkbreeze]

Well, since it's a beta version, there might be bugs to still work out, but glad it's all good for you now. Actually, I think I know what the issue is with standby. That PSU is not Haswell compliant and the C6 and C7 states were probably not supported in the BIOS. Updating to the newer BIOS probably turned on support for the C6 and C7 states and going back to the previous BIOS removed it. That's all I can think of since I know the Corsair CX PSUs need to have the C6 and C7 states disabled in the bios in order to be used with Haswell processors that support the advanced power saving features C6 and C7.

 

[Darkbreeze]

Using a PSU that does have support for those states with Haswell would probably allow the 12c BIOS firmware to operate perfectly fine, or just turning those states to disabled.

 

[Darkbreeze]

You're more than a year late to the party my friend. Please try to refrain from posting in already solved threads that are very old. We call this necro-posting and it's rather heavily frowned upon. Try to pay attention to the dates of the most recent posts to determine if it's still an active thread or not. Thanks.