There is a nasty bug in the Archer C7 firmware. I got a new Dell XPS 9630, with Killer Wifi 1535 network card. If I initiate a local transfer over the network (i.e. stress the wifi out), the Archer C7 will crash within a min or so. Everyone with a Killer 1535 and Archer C7 expirence this. This is not a LEDE bug, but an QCA chipset bug. I've tested this on LEDE (Sept), LEDE (Jan), and Stock TP-LINK (Latest). All 3 firmwares would crash the router within a minute of stressing the 5GHz network using the Killer Wifi 1535. All other network cards are fine, just the Killer Wifi will crash the Archer C7. Once crashed, a router reboot is nessasary.
This is a pretty serious bug, considering anyone with a new Dell (or anyone with a qualcomm atheros qca61x4a/QCA6174 chipset) connects to the Archer C7 will crash the router. It seems like Killer NIC is the main culprit, but TP-Link shouldn't crash when a naughty client connects to it, so both are to blame.
The discussion is described in more detail here:
Anyway, QCA has released a patch to fix this issue, and gave it to TP-LINK. TP-LINK made several "beta" firmwares with the patch applied to see if it fixes the issue. Several people have reported that it has fixed it. It would be nice if we could get this patch pushed to LEDE/OpenWRT. Currently we just have access to the BETA Firmwares, but not the physical patch. I do not know if we would ask TP-LINK for it, or QCA (who gave it to them first). Or if it'll just appear into the ath10k-firmware git eventually? Or if we can extract it from the beta firmware outselves...
I've used the latest LEDE with (QCA988X 10.2.4-1.0-00016), and the problem still exists in this version. I do not know if the patch is even with this firmware, or somewhere else?
I've included some of the more relevant posts from the topic above and quoted them below. Maybe if someone knows how to contact QCA or maybe kvalo to see if this Archer C7 patch to fix the incompatibility issues with qca61x4a chipset will eventually get pushed to the public firmwares?
I've been very impressed with TPLINK on how responsive they have been to their customers about this problem, and how quickly they pushed a beta firmware with the patch for people to test. Now if we could get it pushed to LEDE so our LEDE Archer C7 won't crash if you have a friend come over and connect with a qca61x4a adapter in it.
Solutions for different versions (download link), hope they will help you!
Archer C7 V2
Archer C7 V3
The Killer adapter is exactly the root cause. It's a compatibility issue between Killer series adapter & QCA chipset of C7.
We did report this issue to QCA before and got a patch from them.
And we also made a beta firmware with the patch. Please download and install it on your Archer C7 V2 from the link that Doom shares:
((SEE PREVIOUS POST))
It should fix the issue.
Thank you for your feedback.
Actualy Archer D7 & Archer C7 adopts the same wireless chipset from QCA. So maybe this issue exists with D7 & Killer.
However, we never receive any similar feedback on D7. Could you reply me the hardware & firmware versions of your D7? So that we can try to get a beta firmware to you.
If any other problem, please don't hesitate to post and share here.[/QUOTE]
[QUOTE=TPLINK_SUPPORT]You can try to install the beta firmware as well.
The beta not only solves the compatibility issue with Killer adapters but also fixes some other wireless problems.
If it doesn't make sense, it's recommended to create a ticket to TP-Link's support team for a follow up.[/QUOTE]
[QUOTE=TPLINK_SUPPORT]The beta firmware is a US version which means that customers in USA could upgrade it.
Actualy this beta has the same firmware version 3.15.1 with the official 160719. However, the patch in the beta wasn't added in 160719 as it's given by QCA. In consideration of stability (maybe the patch would have other compatibility problems with other wifi adapters, just not sure), we only add the patch in the beta to help customers that suffering the router crash issue.
However, we will work on this compatibility issue with Dell computers and once get a perfect solution, will release an official firmware to replace the beta.[/QUOTE]