** Description changed:

- My laptop no longer recognises the usb storage devices; I tested with 3
- different devices (usb sticks, external HDD), on all 3 usb ports of the
- laptop (I think one of them is usb 3.0, the others 2.0).
+ 1. Normal boot up (either from the internal HDD or from the usb stick Kubuntu 
Live Session)
+ 2. Mount the usb stick and then unmount (get the "Safely remove" message, but 
do NOT remove the stick from the usb)
+ 3. Restart the laptop (let it boot-up using the internal HDD)
  
- I am sure it is not a hardware problem, as the BIOS can read the devices
- and I can boot from the usb stick.
+ Expected: next session should recognize USB devices (even if it won't
+ "see" the device I left in the USB, it should at least detect its
+ removal or other new devices)
  
- I read on a forum that the usb_storage kernel module may be required and
- so I loaded it manually (and I added it in /etc/modules), but it did not
- help.
- 
- The /var/log/{syslog,dmesg,udev} files did not show any new lines when I
- inserted the flash pen into the usb port.
- 
- The only package that I have installed that it could interfere with the 
kernel abilities to detect the usb devices is virtualbox:
- root@zmb-laptop:~# apt-cache policy virtualbox
- virtualbox:
-   Installed: 4.3.36-dfsg-1+deb8u1ubuntu1.14.04.1
-   Candidate: 4.3.36-dfsg-1+deb8u1ubuntu1.14.04.1
-   Version table:
-  *** 4.3.36-dfsg-1+deb8u1ubuntu1.14.04.1 0
-         500 http://ro.archive.ubuntu.com/ubuntu/ trusty-updates/multiverse 
amd64 Packages
-         500 http://security.ubuntu.com/ubuntu/ trusty-security/multiverse 
amd64 Packages
-         100 /var/lib/dpkg/status
-      4.3.10-dfsg-1 0
-         500 http://ro.archive.ubuntu.com/ubuntu/ trusty/multiverse amd64 
Packages
- 
- This may not help much, but I have the same Kubuntu 14.04 distribution
- installed on my office workstation (an intel i7 lenovo desktop unit) and
- it is successfully detecting and mounting the usb stick (it has the same
- 3.13.0-83-generic kernel version).
- 
-    The output of various commands that may help:
- 
- root@zmb-laptop:~# lsb_release -rd
- Description:    Ubuntu 14.04.4 LTS                                            
                                                                                
                                                                  
- Release:        14.04                                                         
                                                                                
                                                                  
- 
- 
- root@zmb-laptop:~# lsmod 
- Module                  Size  Used by
- ctr                    13049  2 
- ccm                    17773  2 
- pci_stub               12622  1 
- vboxpci                23194  0 
- vboxnetadp             25670  0 
- vboxnetflt             27830  0 
- vboxdrv               414452  3 vboxnetadp,vboxnetflt,vboxpci
- bnep                   19624  2 
- rfcomm                 69160  0 
- autofs4                38674  2 
- nfsd                  284385  2 
- auth_rpcgss            59338  1 nfsd
- nfs_acl                12837  1 nfsd
- nfs                   236726  0 
- lockd                  93941  2 nfs,nfsd
- binfmt_misc            17468  1 
- sunrpc                289260  6 nfs,nfsd,auth_rpcgss,lockd,nfs_acl
- fscache                63988  1 nfs
- xt_hl                  12521  6 
- ip6t_rt                13537  3 
- nf_conntrack_ipv6      18894  7 
- nf_defrag_ipv6         34768  1 nf_conntrack_ipv6
- ip6t_REJECT            12939  3 
- xt_limit               12711  1 
- xt_tcpudp              12884  19 
- xt_addrtype            12635  4 
- uvcvideo               80885  0 
- nf_conntrack_ipv4      15012  7 
- videobuf2_vmalloc      13216  1 uvcvideo
- videobuf2_memops       13362  1 videobuf2_vmalloc
- nf_defrag_ipv4         12758  1 nf_conntrack_ipv4
- intel_rapl             18773  0 
- xt_conntrack           12760  14 
- arc4                   12608  2 
- x86_pkg_temp_thermal    14205  0 
- ath9k                 164164  0 
- ipt_REJECT             12541  3 
- intel_powerclamp       14705  0 
- ip6table_filter        12815  1 
- ip6_tables             27025  1 ip6table_filter
- nf_conntrack_netbios_ns    12665  0 
- nf_conntrack_broadcast    12589  1 nf_conntrack_netbios_ns
- ath9k_common           13551  1 ath9k
- coretemp               13435  0 
- nf_nat_ftp             12770  0 
- videobuf2_core         40664  1 uvcvideo
- nf_nat                 21841  1 nf_nat_ftp
- acer_wmi               32522  0 
- ath9k_hw              453856  2 ath9k_common,ath9k
- sparse_keymap          13948  1 acer_wmi
- kvm_intel             143187  0 
- parport_pc             32701  0 
- kvm                   455843  1 kvm_intel
- nf_conntrack_ftp       18638  1 nf_nat_ftp
- ppdev                  17671  0 
- lp                     17759  0 
- snd_hda_codec_hdmi     46368  1 
- snd_hda_codec_realtek    65904  1 
- nf_conntrack           97202  8 
nf_nat_ftp,nf_conntrack_netbios_ns,nf_nat,xt_conntrack,nf_conntrack_broadcast,nf_conntrack_ftp,nf_conntrack_ipv4,nf_conntrack_ipv6
- snd_hda_intel          56611  4 
- iptable_filter         12810  1 
- ath3k                  17414  0 
- btusb                  32412  0 
- ath                    28698  3 ath9k_common,ath9k,ath9k_hw
- videodev              134688  2 uvcvideo,videobuf2_core
- snd_hda_codec         193017  3 
snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
- ip_tables              27240  1 iptable_filter
- mac80211              630728  1 ath9k
- crct10dif_pclmul       14289  0 
- crc32_pclmul           13113  0 
- cfg80211              484040  3 ath,ath9k,mac80211
- x_tables               34059  12 
ip6table_filter,xt_hl,ip_tables,xt_tcpudp,xt_limit,xt_conntrack,iptable_filter,ip6t_rt,ipt_REJECT,ip6_tables,xt_addrtype,ip6t_REJECT
- snd_hwdep              13602  1 snd_hda_codec
- dm_multipath           22873  0 
- rtsx_pci_ms            18151  0 
- snd_pcm               102099  3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
- scsi_dh                14882  1 dm_multipath
- aesni_intel            55624  4 
- aes_x86_64             17131  1 aesni_intel
- snd_page_alloc         18710  2 snd_pcm,snd_hda_intel
- memstick               16966  1 rtsx_pci_ms
- lrw                    13286  1 aesni_intel
- snd_seq_midi           13324  0 
- gf128mul               14951  1 lrw
- snd_seq_midi_event     14899  1 snd_seq_midi
- glue_helper            13990  1 aesni_intel
- joydev                 17381  0 
- serio_raw              13462  0 
- snd_rawmidi            30144  1 snd_seq_midi
- bluetooth             391136  12 bnep,ath3k,btusb,rfcomm
- snd_seq                61560  2 snd_seq_midi_event,snd_seq_midi
- snd_seq_device         14497  3 snd_seq,snd_rawmidi,snd_seq_midi
- snd_timer              29495  2 snd_pcm,snd_seq
- lpc_ich                21080  0 
- parport                42348  3 lp,ppdev,parport_pc
- ablk_helper            13597  1 aesni_intel
- snd                    69322  19 
snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_seq_midi
- soundcore              12680  1 snd
- cryptd                 20359  2 aesni_intel,ablk_helper
- shpchp                 37032  0 
- mei_me                 18627  0 
- mei                    82276  1 mei_me
- mac_hid                13205  0 
- usb_storage            62209  0 
- btrfs                 840205  1 
- xor                    21411  1 btrfs
- raid6_pq               97812  1 btrfs
- libcrc32c              12644  1 btrfs
- dm_mirror              22135  0 
- dm_region_hash         20862  1 dm_mirror
- dm_log                 18411  2 dm_region_hash,dm_mirror
- rtsx_pci_sdmmc         23274  0 
- i915                  788212  5 
- i2c_algo_bit           13413  1 i915
- psmouse               106692  0 
- drm_kms_helper         55071  1 i915
- ahci                   34091  2 
- libahci                32716  1 ahci
- drm                   303102  4 i915,drm_kms_helper
- r8169                  71677  0 
- mii                    13934  1 r8169
- rtsx_pci               46245  2 rtsx_pci_ms,rtsx_pci_sdmmc
- video                  19476  2 i915,acer_wmi
- wmi                    19177  1 acer_wmi
- 
- 
- root@zmb-laptop:~# lsusb 
- Bus 001 Device 002: ID 8087:8000 Intel Corp. 
- Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
- Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
- Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
- 
- 
- root@zmb-laptop:~# lspci
- 00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)
- 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated 
Graphics Controller (rev 0b)
- 00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 
0b)
- 00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
- 00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
- 00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
- 00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev 
e4)
- 00:1c.3 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 4 (rev 
e4)
- 00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
- 00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
- 00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI 
mode] (rev 04)
- 00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
- 01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5287 
(rev 01)
- 01:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. 
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)
- 02:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless 
Network Adapter (rev 01)
- 
- ProblemType: Bug
- DistroRelease: Ubuntu 14.04
- Package: ubuntu-release-upgrader-core 1:0.220.8
- ProcVersionSignature: Ubuntu 3.13.0-83.127-generic 3.13.11-ckt35
- Uname: Linux 3.13.0-83-generic x86_64
- ApportVersion: 2.14.1-0ubuntu3.19
- Architecture: amd64
- CrashDB: ubuntu
- CurrentDesktop: KDE
- Date: Tue Mar 29 20:39:33 2016
- PackageArchitecture: all
- SourcePackage: ubuntu-release-upgrader
- Symptom: ubuntu-release-upgrader
- UpgradeStatus: No upgrade log present (probably fresh install)
- --- 
- ApportVersion: 2.14.1-0ubuntu3.19
- Architecture: amd64
- AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  zmb        2352 F.... pulseaudio
-  /dev/snd/controlC0:  zmb        2352 F.... pulseaudio
- DistroRelease: Ubuntu 14.04
- MachineType: Acer Extensa 2510
- Package: linux (not installed)
- ProcFB: 0 inteldrmfb
- ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-83-generic 
root=UUID=49bf7b42-01d5-4ba6-9049-c495c5a6e20e ro rootflags=subvol=@ quiet 
splash vt.handoff=7
- ProcVersionSignature: Ubuntu 3.13.0-83.127-generic 3.13.11-ckt35
- PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
- RelatedPackageVersions:
-  linux-restricted-modules-3.13.0-83-generic N/A
-  linux-backports-modules-3.13.0-83-generic  N/A
-  linux-firmware                             1.127.20
- Tags:  trusty
- Uname: Linux 3.13.0-83-generic x86_64
- UpgradeStatus: No upgrade log present (probably fresh install)
- UserGroups:
-  
- _MarkForUpload: True
- dmi.bios.date: 12/18/2014
- dmi.bios.vendor: Insyde Corp.
- dmi.bios.version: V1.26
- dmi.board.asset.tag: Type2 - Board Asset Tag
- dmi.board.name: BA50_HB
- dmi.board.vendor: Acer
- dmi.board.version: V1.26
- dmi.chassis.asset.tag: Chassis Asset Tag
- dmi.chassis.type: 10
- dmi.chassis.vendor: Acer
- dmi.chassis.version: Chassis Version
- dmi.modalias: 
dmi:bvnInsydeCorp.:bvrV1.26:bd12/18/2014:svnAcer:pnExtensa2510:pvrV1.26:rvnAcer:rnBA50_HB:rvrV1.26:cvnAcer:ct10:cvrChassisVersion:
- dmi.product.name: Extensa 2510
- dmi.product.version: V1.26
- dmi.sys.vendor: Acer
+ Actual: rebooting with the USB device still plugged in (after the
+ "safely remove" message) somehow disables all the USB ports of the
+ laptop; no matter if I remove the device afterwards, the USB ports
+ activity no longer gets detected until another reboot.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1563491

Title:
  usb storage devices are no longer recognised by the kernel

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  1. Normal boot up (either from the internal HDD or from the usb stick Kubuntu 
Live Session)
  2. Mount the usb stick and then unmount (get the "Safely remove" message, but 
do NOT remove the stick from the usb)
  3. Restart the laptop (let it boot-up using the internal HDD)

  Expected: next session should recognize USB devices (even if it won't
  "see" the device I left in the USB, it should at least detect its
  removal or other new devices)

  Actual: rebooting with the USB device still plugged in (after the
  "safely remove" message) somehow disables all the USB ports of the
  laptop; no matter if I remove the device afterwards, the USB ports
  activity no longer gets detected until another reboot.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1563491/+subscriptions

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