I experiencing the same problem, I have Qualcomm Atheros - QCA9565 /
AR9565 Wireless Network Adapter. It started after the kernel upgrade,
unfortunately, I am not 100% sure which one exactly - most probably
4.4.0-78, and currently I am on 4.4.0-79 and problem still persists.
After a day or two of work I have sudden 100% CPU load, and then Wi-Fi
failure, which can be cured by the restart only. The messages from the
kernel ring buffer are series of these:
[13228.390795] ath: phy0: DMA failed to stop in 10 ms AR_CR=0xffffffff
AR_DIAG_SW=0xffffffff DMADBG_7=0xffffffff
[13228.575235] ath: phy0: Chip reset failed
[13228.575236] ath: phy0: Unable to reset channel, reset status -22
After stopping WiFi CPU goes back to normal, but as I said, WiFi driver
cannot resume its function and only restart helps.
Also 'lshw -C network' output
*-network
description: Wireless interface
product: QCA9565 / AR9565 Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:04:00.0
logical name: wlan0
version: 01
serial: dc:85:de:f8:f1:d1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress cap_list rom ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=4.4.0-79-generic
firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:10 memory:f7900000-f797ffff memory:f7980000-f798ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0.1
bus info: pci@0000:05:00.1
logical name: eth0
version: 12
serial: 1c:b7:2c:24:c5:cc
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet
physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169
driverversion=2.3LK-NAPI duplex=full firmware=rtl8411-2_0.0.1 07/08/13
ip=192.168.0.103 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
resources: irq:10 ioport:d000(size=256) memory:f7814000-f7814fff
memory:f7810000-f7813fff
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https://bugs.launchpad.net/bugs/1629469
Title:
wifi wi-fi wireless connection drops down randomly
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