Using the Intel 7260 AC Wireless chipset, there is a noticeable slowdown and multiple disconnection problem. When connected to a hotspot it is unusable (multiple disconnections, ICMP times nearly 8000MS). Turning off power management via "iwconfig wlan0 power off" seems to resolve the issue.
When the power management is on, you see excessive retries and also spectrum hopping (2.4 to 5.0 and back). The reported link quality is reported by iwconfig between 15-25 out of 70 even though the source is within inches or up to 3 feet away. When connected to a 802.1b/g/n/a/ac infrastructure network, you will seep speeds around 2Mbit, and quick dropping to 100-300Kbit on download (testing via large file gets and HTML5 speed testing). Turning power management off and blacklisting via echo 'HOOK_BLACKLIST="wireless"' > /etc/pm.d/config.d/blacklist seems to resoove the issue. The exessive retries do not exist nor does the spectrum hopping. The provisioned speeds in both highly interfere WiFi areas and interfere-less areas match the expected speeds 50-80Mbit Download / 8-15Mbit Upload. Testing via a local large file, similarly does not have the same issue. It does appear to be the chipset specifically, because USB tethering or being wired via ethernet do not exhibit this problem, it is only using the WiFi chip. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1319791 Title: [Dell Latitude E7440] WiFi issue To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1319791/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
