我的Wi-Fi连接在17.10更新（从17.04）后非常不稳定。我经常遇到断开连接的问题（每10~15分钟一次），只需重新连接到SSID即可解决。
网卡型号是：
电脑是戴尔XPS 13' 9360。
在17.04版本上，Wifi工作正常（信号不太好但没有断开连接）。
诊断结果：
网卡型号是：
sudo lshw -class network
*-network
description: Wireless interface
product: QCA6174 802.11ac Wireless Network Adapter
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:3a:00.0
logical name: wlp58s0
version: 32
serial: ****
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ath10k_pci driverversion=4.13.0-16-generic firmware=WLAN.RM.4.4-00022-QCARMSWPZ-2 ip=192.168.1.49 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:286 memory:dc000000-dc1fffff
电脑是戴尔XPS 13' 9360。
在17.04版本上，Wifi工作正常（信号不太好但没有断开连接）。
诊断结果：
########## wireless info START ##########编辑： Zsolt Rizsányi提供的解决方案有效，另外我选择更换了我的WiFi卡为Intel 8265，它具有更好的信号覆盖范围和对5G频率的更好支持。
Report from: 22 Oct 2017 12:10 CEST +0200
Booted last: 22 Oct 2017 00:00 CEST +0200
Script from: 25 Mar 2017 07:04 UTC +0000
##### release ###########################
Distributor ID: Ubuntu Description: Ubuntu 17.10 Release: 17.10 Codename: artful
##### kernel ############################
Linux 4.13.0-16-generic #19-Ubuntu SMP Wed Oct 11 18:35:14 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, quiet, splash, video.use_native_backlight=1, vt.handoff=7
##### desktop ########################### i3
##### lspci #############################
3a:00.0 Network controller [0280]: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter [168c:003e] (rev 32) Subsystem: Bigfoot Networks, Inc. QCA6174 802.11ac Wireless Network Adapter [1a56:1535] Kernel driver in use: ath10k_pci
##### lsusb #############################
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 0c45:670c Microdia Bus 001 Device 003: ID 04f3:20d0 Elan Microelectronics Corp. Bus 001 Device 002: ID 0cf3:e300 Atheros Communications, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
##### PCMCIA card info ##################
##### rfkill ############################
1: phy0: Wireless LAN Soft blocked: no Hard blocked: no 2: hci0: Bluetooth Soft blocked: no Hard blocked: no
##### lsmod #############################
ath10k_pci 45056 0 dell_laptop 20480 0 ath10k_core 352256 1 ath10k_pci ath 28672 1 ath10k_core mac80211 778240 1 ath10k_core cfg80211 610304 3 mac80211,ath,ath10k_core wmi_bmof 16384 0 dell_wmi 16384 0 dell_smbios 16384 2 dell_wmi,dell_laptop sparse_keymap 16384 3 dell_wmi,intel_hid,intel_vbtn wmi 24576 2 dell_wmi,wmi_bmof video 40960 3 dell_wmi,dell_laptop,i915
##### interfaces ########################
auto lo iface lo inet loopback dns-nameservers 127.0.0.1
##### ifconfig ########################## lo: flags=73 mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1000 (Local Loopback) RX packets 3693 bytes 416071 (416.0 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3693 bytes 416071 (416.0 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp58s0: flags=4163 mtu 1500 inet 192.168.1.49 netmask 255.255.255.0 broadcast 192.168.1.255 inet6 **** prefixlen 64 scopeid 0x0 inet6 **** prefixlen 64 scopeid 0x20 inet6 **** prefixlen 64 scopeid 0x0 ether txqueuelen 1000 (Ethernet) RX packets 1314397 bytes 1910643192 (1.9 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 398128 bytes 49026367 (49.0 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
##### iwconfig ########################## lo no wireless extensions.
wlp58s0 IEEE 802.11 ESSID:"****" Mode:Managed Frequency:2.447 GHz Access Point: Bit Rate=1 Mb/s Tx-Power=20 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:on Link Quality=70/70 Signal level=-40 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:70 Missed beacon:0
##### route #############################
Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.254 0.0.0.0 UG 600 0 0 wlp58s0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 wlp58s0 192.168.1.0 0.0.0.0 255.255.255.0 U 600 0 0 wlp58s0
##### resolv.conf #######################
nameserver 127.0.0.1
##### network managers ##################
Installed:
NetworkManager Running:
root 834 1 0 10:14 ? 00:00:07 /usr/sbin/NetworkManager --no-daemon
##### NetworkManager info ###############
GENERAL.DEVICE: wlp58s0 GENERAL.TYPE: wifi GENERAL.NM-TYPE: NMDeviceWifi GENERAL.VENDOR: Qualcomm Atheros GENERAL.PRODUCT: QCA6174 802.11ac Wireless Network Adapter GENERAL.DRIVER: ath10k_pci GENERAL.DRIVER-VERSION: 4.13.0-16-generic GENERAL.FIRMWARE-VERSION: WLAN.RM.4.4-00022-QCARMSWPZ-2 GENERAL.HWADDR: GENERAL.MTU: 1500 GENERAL.STATE: 100 (connected) GENERAL.REASON: 0 (No reason given) GENERAL.UDI: /sys/devices/pci0000:00/0000:00:1c.4/0000:3a:00.0/net/wlp58s0 GENERAL.IP-IFACE: wlp58s0 GENERAL.IS-SOFTWARE: no GENERAL.NM-MANAGED: yes GENERAL.AUTOCONNECT: yes GENERAL.FIRMWARE-MISSING: no GENERAL.NM-PLUGIN-MISSING: no GENERAL.PHYS-PORT-ID: -- GENERAL.CONNECTION: **** GENERAL.CON-UUID: **** GENERAL.CON-PATH: /org/freedesktop/NetworkManager/ActiveConnection/7 GENERAL.METERED: no (guessed) CAPABILITIES.CARRIER-DETECT: no CAPABILITIES.SPEED: 1 Mb/s CAPABILITIES.IS-SOFTWARE: no CAPABILITIES.SRIOV: no WIFI-PROPERTIES.WEP: yes WIFI-PROPERTIES.WPA: yes WIFI-PROPERTIES.WPA2: yes WIFI-PROPERTIES.TKIP: yes WIFI-PROPERTIES.CCMP: yes WIFI-PROPERTIES.AP: yes WIFI-PROPERTIES.ADHOC: yes WIFI-PROPERTIES.2GHZ: yes WIFI-PROPERTIES.5GHZ: yes IP4.ADDRESS[1]: 192.168.1.49/24 IP4.GATEWAY: 192.168.1.254 IP4.ROUTE[1]: dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000 IP4.DNS[1]: 192.168.1.254 DHCP4.OPTION[1]: requested_routers = 1 DHCP4.OPTION[2]: requested_domain_search = 1 DHCP4.OPTION[3]: requested_time_offset = 1 DHCP4.OPTION[4]: requested_domain_name = 1 DHCP4.OPTION[5]: requested_rfc3442_classless_static_routes = 1 DHCP4.OPTION[6]: requested_broadcast_address = 1 DHCP4.OPTION[7]: requested_netbios_scope = 1 DHCP4.OPTION[8]: requested_wpad = 1 DHCP4.OPTION[9]: next_server = 0.0.0.0 DHCP4.OPTION[10]: expiry = 1508710174 DHCP4.OPTION[11]: requested_interface_mtu = 1 DHCP4.OPTION[12]: requested_subnet_mask = 1 DHCP4.OPTION[13]: routers = 192.168.1.254 DHCP4.OPTION[14]: dhcp_message_type = 5 DHCP4.OPTION[15]: ip_address = 192.168.1.49 DHCP4.OPTION[16]: broadcast_address = 192.168.1.255 DHCP4.OPTION[17]: requested_static_routes = 1 DHCP4.OPTION[18]: requested_domain_name_servers = 1 DHCP4.OPTION[19]: requested_ntp_servers = 1 DHCP4.OPTION[20]: requested_netbios_name_servers = 1 DHCP4.OPTION[21]: dhcp_lease_time = 43200 DHCP4.OPTION[22]: domain_name_servers = 192.168.1.254 DHCP4.OPTION[23]: requested_ms_classless_static_routes = 1 DHCP4.OPTION[24]: subnet_mask = 255.255.255.0 DHCP4.OPTION[25]: network_number = 192.168.1.0 DHCP4.OPTION[26]: requested_host_name = 1 DHCP4.OPTION[27]: dhcp_server_identifier = 192.168.1.254 IP6.ADDRESS[1]: ****/64 IP6.ADDRESS[2]: ****/64 IP6.ADDRESS[3]: ****/64 IP6.GATEWAY: **** IP6.ROUTE[1]: dst = ****::/64, nh = ::, mt = 600 IP6.DNS[1]: **** IP6.DNS[2]: ****
SSID BSSID MODE CHAN FREQ RATE SIGNAL BARS SECURITY ACTIVE * **HIDDEN FOR PRIVACY**
##### NetworkManager.state ##############
[main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true ##### NetworkManager.conf ###############
[main] plugins=ifupdown,keyfile [ifupdown] managed=false [device] wifi.scan-rand-mac-address=no
##### NetworkManager profiles ########### ** HIDDEN FOR PRIVACY **
##### iw reg get ########################
global country 00: DFS-UNSET (2402 - 2472 @ 40), (N/A, 20), (N/A) (2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, NO-IR (2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, NO-IR (5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, NO-IR (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, NO-IR (5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, NO-IR (5735 - 5835 @ 80), (N/A, 20), (N/A), NO-IR (57240 - 63720 @ 2160), (N/A, 0), (N/A)
##### iwlist channels ################### lo no frequency information.
wlp58s0 32 channels in total; available frequencies : Channel 01 : 2.412 GHz Channel 02 : 2.417 GHz Channel 03 : 2.422 GHz Channel 04 : 2.427 GHz Channel 05 : 2.432 GHz Channel 06 : 2.437 GHz Channel 07 : 2.442 GHz Channel 08 : 2.447 GHz Channel 09 : 2.452 GHz Channel 10 : 2.457 GHz Channel 11 : 2.462 GHz Channel 12 : 2.467 GHz Channel 13 : 2.472 GHz Channel 36 : 5.18 GHz Channel 40 : 5.2 GHz Channel 44 : 5.22 GHz Channel 48 : 5.24 GHz Channel 52 : 5.26 GHz Channel 56 : 5.28 GHz Channel 60 : 5.3 GHz Channel 64 : 5.32 GHz Channel 100 : 5.5 GHz Channel 104 : 5.52 GHz Channel 108 : 5.54 GHz Channel 112 : 5.56 GHz Channel 116 : 5.58 GHz Channel 120 : 5.6 GHz Channel 124 : 5.62 GHz Channel 128 : 5.64 GHz Channel 132 : 5.66 GHz Channel 136 : 5.68 GHz Channel 140 : 5.7 GHz Current Frequency:2.447 GHz (Channel 8)
##### iwlist scan ####################### lo Interface doesn't support scanning.
wlp58s0 Interface doesn't support scanning : Device or resource busy
##### module infos ######################
[ath10k_pci] filename: /lib/modules/4.13.0-16-generic/kernel/drivers/net/wireless/ath/ath10k/ath10k_pci.ko firmware: ath10k/QCA9377/hw1.0/board.bin firmware: ath10k/QCA9377/hw1.0/firmware-5.bin firmware: ath10k/QCA6174/hw3.0/board-2.bin firmware: ath10k/QCA6174/hw3.0/board.bin firmware: ath10k/QCA6174/hw3.0/firmware-6.bin firmware: ath10k/QCA6174/hw3.0/firmware-5.bin firmware: ath10k/QCA6174/hw3.0/firmware-4.bin firmware: ath10k/QCA6174/hw2.1/board-2.bin firmware: ath10k/QCA6174/hw2.1/board.bin firmware: ath10k/QCA6174/hw2.1/firmware-5.bin firmware: ath10k/QCA6174/hw2.1/firmware-4.bin firmware: ath10k/QCA9887/hw1.0/board-2.bin firmware: ath10k/QCA9887/hw1.0/board.bin firmware: ath10k/QCA9887/hw1.0/firmware-5.bin firmware: ath10k/QCA988X/hw2.0/board-2.bin firmware: ath10k/QCA988X/hw2.0/board.bin firmware: ath10k/QCA988X/hw2.0/firmware-5.bin firmware: ath10k/QCA988X/hw2.0/firmware-4.bin firmware: ath10k/QCA988X/hw2.0/firmware-3.bin firmware: ath10k/QCA988X/hw2.0/firmware-2.bin license: Dual BSD/GPL description: Driver support for Qualcomm Atheros 802.11ac WLAN PCIe/AHB devices author: Qualcomm Atheros srcversion: 8D7A52EE462CD73D0445DB2 depends: ath10k_core intree: Y name: ath10k_pci vermagic: 4.13.0-16-generic SMP mod_unload signat: PKCS#7 signer: sig_key: sig_hashalgo: md4 parm: irq_mode:0: auto, 1: legacy, 2: msi (default: 0) (uint) parm: reset_mode:0: auto, 1: warm only (default: 0) (uint)
[ath10k_core] filename: /lib/modules/4.13.0-16-generic/kernel/drivers/net/wireless/ath/ath10k/ath10k_core.ko license: Dual BSD/GPL description: Core module for Qualcomm Atheros 802.11ac wireless LAN cards. author: Qualcomm Atheros srcversion: 7F06478F5745B064BF3BC89 depends: mac80211,cfg80211,ath intree: Y name: ath10k_core vermagic: 4.13.0-16-generic SMP mod_unload signat: PKCS#7 signer: sig_key: sig_hashalgo: md4 parm: debug_mask:Debugging mask (uint) parm: uart_print:Uart target debugging (bool) parm: skip_otp:Skip otp failure for calibration in testmode (bool) parm: cryptmode:Crypto mode: 0-hardware, 1-software (uint) parm: rawmode:Use raw 802.11 frame datapath (bool)
[ath] filename: /lib/modules/4.13.0-16-generic/kernel/drivers/net/wireless/ath/ath.ko license: Dual BSD/GPL description: Shared library for Atheros wireless LAN cards. author: Atheros Communications srcversion: 555BBBB9D4FCA58A05E7C0D depends: cfg80211 intree: Y name: ath vermagic: 4.13.0-16-generic SMP mod_unload signat: PKCS#7 signer: sig_key: sig_hashalgo: md4
[mac80211] filename: /lib/modules/4.13.0-16-generic/kernel/net/mac80211/mac80211.ko license: GPL description: IEEE 802.11 subsystem srcversion: 66E288B8743878C5423A01E depends: cfg80211 intree: Y name: mac80211 vermagic: 4.13.0-16-generic SMP mod_unload signat: PKCS#7 signer: sig_key: sig_hashalgo: md4 parm: minstrel_vht_only:Use only VHT rates when VHT is supported by sta. (bool) parm: max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int) parm: max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int) parm: beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int) parm: probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int) parm: ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)
[cfg80211] filename: /lib/modules/4.13.0-16-generic/kernel/net/wireless/cfg80211.ko description: wireless configuration support license: GPL author: Johannes Berg srcversion: A854863B536C70273DE73A5 depends: intree: Y name: cfg80211 vermagic: 4.13.0-16-generic SMP mod_unload signat: PKCS#7 signer: sig_key: sig_hashalgo: md4 parm: bss_entries_limit:limit to number of scan BSS entries (per wiphy, default 1000) (int) parm: ieee80211_regdom:IEEE 802.11 regulatory domain code (charp) parm: cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)
##### module parameters #################
[ath10k_pci] irq_mode: 0 reset_mode: 0
[ath10k_core] cryptmode: 0 debug_mask: 0 rawmode: N skip_otp: N uart_print: N
[mac80211] beacon_loss_count: 7 ieee80211_default_rc_algo: minstrel_ht max_nullfunc_tries: 2 max_probe_tries: 5 minstrel_vht_only: Y probe_wait_ms: 500
[cfg80211] bss_entries_limit: 1000 cfg80211_disable_40mhz_24ghz: N ieee80211_regdom: 00
##### /etc/modules ######################
##### modprobe options ##################
[/etc/modprobe.d/blacklist-ath_pci.conf] blacklist ath_pci
[/etc/modprobe.d/blacklist.conf] blacklist evbug blacklist usbmouse blacklist usbkbd blacklist eepro100 blacklist de4x5 blacklist eth1394 blacklist snd_intel8x0m blacklist snd_aw2 blacklist i2c_i801 blacklist prism54 blacklist bcm43xx blacklist garmin_gps blacklist asus_acpi blacklist snd_pcsp blacklist pcspkr blacklist amd76x_edac
[/etc/modprobe.d/blacklist-rare-network.conf] alias net-pf-3 off alias net-pf-6 off alias net-pf-9 off alias net-pf-11 off alias net-pf-12 off alias net-pf-19 off alias net-pf-21 off alias net-pf-36 off
[/etc/modprobe.d/intel-microcode-blacklist.conf] blacklist microcode [/etc/modprobe.d/iwlwifi.conf] remove iwlwifi \ (/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \ && /sbin/modprobe -r mac80211
[/etc/modprobe.d/mlx4.conf] softdep mlx4_core post: mlx4_en
##### rc.local ##########################
grep: /etc/rc.local: No such file or directory
##### pm-utils ##########################
##### udev rules ########################
##### dmesg #############################
[ 2518.493849] wlp58s0: send auth to (try 1/3) [ 2518.498139] wlp58s0: authenticated [ 2518.510661] wlp58s0: associate with (try 1/3) [ 2518.514808] wlp58s0: RX AssocResp from (capab=0x411 status=0 aid=1) [ 2518.517910] wlp58s0: associated [ 2518.518031] IPv6: ADDRCONF(NETDEV_CHANGE): wlp58s0: link becomes ready [ 3790.657597] wlp58s0: deauthenticating from by local choice (Reason: 3=DEAUTH_LEAVING) [ 3790.691224] wlp58s0: authenticate with [ 3790.744676] wlp58s0: send auth to (try 1/3) [ 3791.745320] wlp58s0: send auth to (try 2/3) [ 3792.702724] wlp58s0: authenticated [ 3792.705567] wlp58s0: associate with (try 1/3) [ 3792.708886] wlp58s0: RX AssocResp from (capab=0x411 status=0 aid=1) [ 3792.712592] wlp58s0: associated [ 4892.860736] wlp58s0: deauthenticating from by local choice (Reason: 3=DEAUTH_LEAVING) [ 4896.836038] wlp58s0: authenticate with [ 4896.888893] wlp58s0: send auth to (try 1/3) [ 4896.890516] wlp58s0: authenticated [ 4896.892901] wlp58s0: associate with (try 1/3) [ 4896.897903] wlp58s0: RX AssocResp from (capab=0x411 status=0 aid=1) [ 4896.900310] wlp58s0: associated
########## wireless info END ############
