There's a lot of laptops that exhibit this issue. When 3.0 is working, folk praise it but given the misfire my advice is to return it as defective since Dell and others seem to be unable to fix it. So the horrible thing is that some won't return it and companies get the idea that shipping a not ready product is OK.
Sort of like car companies where "we'll fix it at the dealer."
Alert! Need additional confirmation on this!
Dell Level-3 Technical Support can not explain why numerous XPS 15 (L521X) laptop USB 3.0 Super-speed ports perform at only USB 2.0 High-speed. USB 3.0 compliant devices do NOT perform at USB 3.0 Super-speed. None do.
This occur on *numerous* units, Dell Level 3 Technical Support says. "It's random", they say. In my expereince, bugs are not random.
Dell's "My Dell Support Center" diagnostic software also indicates this, as it shows the USB version and speed, both.
USB.org's SuperSpeed USB Software and Hardware Tool, "USB30CV Tool" speed tests fail for USB 3.0. It confirms both my connected devices are indeed USB 3.0 compliant, BTW. The tool requires MSXML6 installed, and is at: (http://www.usb.org/developers/ssusb/ssusbtools/USB30CV_Releasex64_188.8.131.52.msi)
Of interest: Dell has offered to fully refund the entire amount of my purchase to return this to them, 2 months after my purchase. Is this a serious issue and does it remain publicly unknown?
A Service Request for this remains open regarding this, under my name. I first diagnosed and reported this issue to Dell Technical Support on 12/29/2012. When I purchased a 2nd USB 3.0 device, I pursued this. From what they have told me it still remains unresolved and open.
The XPS 15 L521X model has three USB ports, all three advertised as USB 3.0 compliant Super-speed ports. It has no other USB ports besides these. It has no USB 2.0 ports.
NOTE: None of the USB ports on the Dell XPS 15 L521X (Service Tag 75HTJV1) appear colored blue, as many USB 3.0 ports do traditionally on other devices. This does not indicate anything conclusive, yet it seems of interest given the issue.
Can anyone else confirm, or debunk, this on another Dell XPS 15 (L521X) laptop? Yes, I know it seems highly unlikely that no one has yet to discover such a huge bug if indeed it exists -- yet it's not impossible. It is not an obvious bug to notice if one does not look for it. The fact that it has gone to Dell Tech support Level 3, and still has no resolution, speaks for itself.
This strikes me as a potentially significant bug that possibly affects numerous Dell XPS 15 laptop users. I was told Dell has sold over 400,000 XPS 15 units.
This falls somewhat outside of my area of expertise. Hence my call for expert help and independent confirmation.
My laptop details:
Dell XPS 15 (L521X) laptop
Service Tag: 75HTJV1
OS: Windows 8 64x
Purchased: December 2012, direct from Dell online, for personal use.
All drivers and BIOS updated to latest versions from Dell.
Windows 8 drivers up to date.
BIOS USB Debugging option: disabled (DEFAULT)
My devices with which I tested are USB 3.0 compliant - not just compatible.
I hope to hear from someone who can shed better light on this. Thanks.