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[Keng-Yu Lin <keng-yu.lin@xxxxxxxxxxxxx>]

** Project changed: hwe-next => linux

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1445775

Title:
  RTL8723BE throws stack trace in kernel 3.19 and disconnects

Status in The Linux Kernel:
  Incomplete
Status in linux package in Ubuntu:
  New

Bug description:
  Hi,

  I have the well known, problem causing, RTL8723BE wifi card on Lenovo
  Flex 2 laptop and I'm running Ubuntu 15.04 beta. If there is too much
  traffic through the wifi card like downloading an iso via torrent , I
  get a stacktrace and the wifi disconnects and does not connect
  automatically. Either I have to disable the wifi and re-enable it or I
  have to restart my laptop to get the wifi connection back.

  the stack trace is below

  Apr 18 18:16:23 flex2 kernel: ------------[ cut here ]------------
  Apr 18 18:16:23 flex2 kernel: WARNING: CPU: 0 PID: 0 at /build/buildd/linux-3.19.0/drivers/gpu/drm/i915/intel_display.c:9713 intel_check_page_flip+0xda/0xf0 [i915]()
  Apr 18 18:16:23 flex2 kernel: Kicking stuck page flip: queued at 169616, now 169621
  Apr 18 18:16:23 flex2 kernel: Modules linked in: uas usb_storage vmw_vsock_vmci_transport vsock vmw_vmci pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ctr ccm rfcomm bnep thinkpad_acpi binfmt_misc nvram msr nls_iso8859_1 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul snd_soc_rt5640 crc32_pclmul snd_soc_rl6231 ghash_clmulni_intel uvcvideo videobuf2_vmalloc videobuf2_memops aesni_intel snd_soc_core snd_hda_codec_realtek snd_hda_codec_hdmi snd_compress snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_pcm_dmaengine hid_multitouch aes_x86_64 snd_hwdep arc4 videobuf2_core snd_pcm v4l2_common rtl8723be btusb btcoexist rtl8723_common lrw rtl_pci nouveau rtlwifi mac80211 i915 bluetooth cfg80211 gf128mul snd_seq_midi glue_helper mxm_wmi
  Apr 18 18:16:23 flex2 kernel:  videodev snd_seq_midi_event ablk_helper media ttm snd_rawmidi cryptd joydev snd_seq dm_multipath snd_seq_device scsi_dh drm_kms_helper mei_me snd_timer dw_dmac ideapad_laptop drm snd mei sparse_keymap shpchp lpc_ich i2c_hid snd_soc_sst_acpi i2c_algo_bit i2c_designware_platform video soundcore dw_dmac_core 8250_dw i2c_designware_core spi_pxa2xx_platform mac_hid serio_raw wmi 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 ip_tables sunrpc x_tables parport_pc ppdev lp parport autofs4
  Apr 18 18:16:23 flex2 kernel:  usbhid hid psmouse ahci libahci r8169 mii dm_mirror dm_region_hash dm_log sdhci_acpi sdhci
  Apr 18 18:16:23 flex2 kernel: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G        W  OE  3.19.0-12-generic #12-Ubuntu
  Apr 18 18:16:23 flex2 kernel: Hardware name: LENOVO 20404/Lenovo Flex 2-14, BIOS A0CN21WW 03/21/2014
  Apr 18 18:16:23 flex2 kernel:  ffffffffc0748e10 ffff88012f203d28 ffffffff817c2175 0000000000000007
  Apr 18 18:16:23 flex2 kernel:  ffff88012f203d78 ffff88012f203d68 ffffffff8107595a ffff88012f203d88
  Apr 18 18:16:23 flex2 kernel:  ffff88012a898000 ffff8800bf12a000 0000000000000000 ffff8800bf12a1a8
  Apr 18 18:16:23 flex2 kernel: Call Trace:
  Apr 18 18:16:23 flex2 kernel:  <IRQ>  [<ffffffff817c2175>] dump_stack+0x45/0x57
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff8107595a>] warn_slowpath_common+0x8a/0xc0
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff810759d6>] warn_slowpath_fmt+0x46/0x50
  Apr 18 18:16:23 flex2 kernel:  [<ffffffffc06f4a3a>] intel_check_page_flip+0xda/0xf0 [i915]
  Apr 18 18:16:23 flex2 kernel:  [<ffffffffc06c1948>] ironlake_irq_handler+0x2e8/0xfd0 [i915]
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff810b0dff>] ? rebalance_domains+0x16f/0x280
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff810d5ba0>] ? __note_gp_changes+0x20/0x60
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff810cd577>] handle_irq_event_percpu+0x77/0x1a0
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff810cd6e1>] handle_irq_event+0x41/0x70
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff810d074e>] handle_edge_irq+0x6e/0x120
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff81017772>] handle_irq+0x22/0x40
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff817cc1bf>] do_IRQ+0x4f/0xf0
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff817ca02d>] common_interrupt+0x6d/0x6d
  Apr 18 18:16:23 flex2 kernel:  <EOI>  [<ffffffff81664335>] ? cpuidle_enter_state+0x65/0x160
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff81664321>] ? cpuidle_enter_state+0x51/0x160
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff81664517>] cpuidle_enter+0x17/0x20
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff810b69c1>] cpu_startup_entry+0x311/0x3b0
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff817b6a47>] rest_init+0x77/0x80
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff81d4cfce>] start_kernel+0x482/0x48f
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff81d4c120>] ? early_idt_handlers+0x120/0x120
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff81d4c4d7>] x86_64_start_reservations+0x2a/0x2c
  Apr 18 18:16:23 flex2 kernel:  [<ffffffff81d4c61c>] x86_64_start_kernel+0x143/0x152
  Apr 18 18:16:23 flex2 kernel: ---[ end trace 78327f32f7248597 ]---

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