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[dif <dif@xxxxxxx>]

" lspci -vv" gives:

05:00.0 Network controller: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter (rev 03)
	Subsystem: ASUSTeK Computer Inc. Device 855c
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at dfa00000 (64-bit, non-prefetchable) [size=32K]
	Region 2: Memory at df800000 (64-bit, non-prefetchable) [size=2M]
	Capabilities: [48] Power Management version 3
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=2 PME-
	Capabilities: [58] MSI: Enable- Count=1/1 Maskable- 64bit+
		Address: 0000000000000000  Data: 0000
	Capabilities: [68] Vendor Specific Information: Len=44 <?>
	Capabilities: [ac] Express (v2) Endpoint, MSI 00
		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
			ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
		DevCtl:	Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
			RlxdOrd- ExtTag- PhantFunc- AuxPwr+ NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 1024 bytes
		DevSta:	CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
		LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <2us, L1 <32us
			ClockPM+ Surprise- LLActRep- BwNot-
		LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk+
			ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR+, OBFF Via WAKE#
		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, OBFF Disabled
		LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
			 Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
			 Compliance De-emphasis: -6dB
		LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
			 EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
	Capabilities: [100 v1] Advanced Error Reporting
		UESta:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UEMsk:	DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
		UESvrt:	DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
		CESta:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
		CEMsk:	RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
		AERCap:	First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
	Capabilities: [13c v1] Device Serial Number 6c-71-00-ff-ff-00-00-01
	Capabilities: [150 v1] Power Budgeting <?>
	Capabilities: [160 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=01
			Status:	NegoPending- InProgress-
	Capabilities: [1b0 v1] Latency Tolerance Reporting
		Max snoop latency: 71680ns
		Max no snoop latency: 71680ns
	Capabilities: [220 v1] #15
	Kernel driver in use: wl

"dpgk -l | grep wl" gives:
ii  bcmwl-kernel-source      6.30.223.248+bdcom-0ubuntu2                amd64        Broadcom 802.11 Linux STA wireless driver source

-- 
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https://bugs.launchpad.net/bugs/1454717

Title:
  Weak wifi signal and frequency disconnects

Status in bcmwl package in Ubuntu:
  Confirmed

Bug description:
  This bug duplicate
  https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1379524 but it
  marked expired.

  Symptoms same - on my notebook HP Pavilion p170nr with BCM43142 chip
  has very low and unstable wi-fi signal. I even can't work from far
  room because of permanent disconnects and very low speed. Windows 8 in
  same place work fine also all phones.

  Also connection frequency disappear. Disconnects don't depend on
  signal level. Connection may break even near router and hi (relative)
  signal. I changed router but this didn't help.

  I don't know if it help, but I get this message in dmesg log

  [29218.308151] ------------[ cut here ]------------
  [29218.308177] WARNING: CPU: 2 PID: 524 at /build/buildd/linux-3.19.0/net/wireless/sme.c:800 cfg80211_roamed+0x91/0xa0 [cfg80211]()
  [29218.308179] Modules linked in: rfcomm bnep binfmt_misc bbswitch(OE) nls_iso8859_1 intel_rapl iosf_mbi hp_wmi sparse_keymap x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic wl(POE) snd_hda_intel snd_hda_controller coretemp kvm_intel snd_hda_codec snd_hwdep btusb kvm snd_pcm uvcvideo crct10dif_pclmul snd_seq_midi snd_seq_midi_event bluetooth snd_rawmidi crc32_pclmul videobuf2_vmalloc snd_seq videobuf2_memops videobuf2_core ghash_clmulni_intel v4l2_common aesni_intel videodev media aes_x86_64 lrw gf128mul glue_helper snd_seq_device ablk_helper snd_timer dm_multipath cryptd scsi_dh i915 snd cfg80211 soundcore hp_accel joydev serio_raw lis3lv02d input_polldev shpchp drm_kms_helper hp_wireless mei_me wmi drm video i2c_algo_bit mei intel_smartconnect lpc_ich
  [29218.308208]  mac_hid ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter parport_pc ppdev ip_tables x_tables lp parport autofs4 hid_generic usbhid hid psmouse ahci r8169 libahci mii
  [29218.308231] CPU: 2 PID: 524 Comm: wl_event_handle Tainted: P        W  OE  3.19.0-16-generic #16-Ubuntu
  [29218.308232] Hardware name: Hewlett-Packard HP Pavilion 15 Notebook PC /2281, BIOS F.12 08/18/2014
  [29218.308233]  ffffffffc0478a78 ffff8801d55c3da8 ffffffff817c2235 0000000000000007
  [29218.308236]  0000000000000000 ffff8801d55c3de8 ffffffff8107595a ffff8801d23c9078
  [29218.308238]  ffff8801d26bb000 ffff8801d4a52b40 000000000000009f ffff8801c5b74b40
  [29218.308240] Call Trace:
  [29218.308246]  [<ffffffff817c2235>] dump_stack+0x45/0x57
  [29218.308250]  [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
  [29218.308252]  [<ffffffff81075a4a>] warn_slowpath_null+0x1a/0x20
  [29218.308260]  [<ffffffffc0454a81>] cfg80211_roamed+0x91/0xa0 [cfg80211]
  [29218.308290]  [<ffffffffc0a0b9fb>] wl_notify_roaming_status+0xcb/0x150 [wl]
  [29218.308312]  [<ffffffffc0a0875a>] wl_event_handler+0x6a/0x230 [wl]
  [29218.308333]  [<ffffffffc0a086f0>] ? wl_free_wdev.isra.23+0x80/0x80 [wl]
  [29218.308336]  [<ffffffff81094759>] kthread+0xc9/0xe0
  [29218.308339]  [<ffffffff81094690>] ? kthread_create_on_node+0x1c0/0x1c0
  [29218.308342]  [<ffffffff817c9298>] ret_from_fork+0x58/0x90
  [29218.308344]  [<ffffffff81094690>] ? kthread_create_on_node+0x1c0/0x1c0
  [29218.308346] ---[ end trace 0970ead2c419c952 ]---
  [29222.548357] cfg80211: Calling CRDA to update world regulatory domain
  [29222.575949] cfg80211: World regulatory domain updated:
  [29222.575952] cfg80211:  DFS Master region: unset
  [29222.575953] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  [29222.575956] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29222.575958] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29222.575959] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29222.575961] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29222.575962] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.744616] cfg80211: Calling CRDA to update world regulatory domain
  [29228.753685] cfg80211: World regulatory domain updated:
  [29228.753696] cfg80211:  DFS Master region: unset
  [29228.753701] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  [29228.753711] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.753718] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.753725] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.753731] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
  [29228.753735] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: bcmwl-kernel-source 6.30.223.248+bdcom-0ubuntu2
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed May 13 16:50:24 2015
  InstallationDate: Installed on 2014-11-23 (171 days ago)
  InstallationMedia:
   
  SourcePackage: bcmwl
  UpgradeStatus: No upgrade log present (probably fresh install)

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