kernel-packages team mailing list archive

[Theodore Ts'o <tytso@xxxxxxx>]

I tried applying the patch ([PATCH]HDMI connection via dock works with
some (random) delay:
https://bugs.freedesktop.org/attachment.cgi?id=93653) against a 3.13
kernel, and it makes things **worse** on my T540p.   With the 3.13
kernel w/o the patch, I can boot and start up the X server w/o problems,
as long as it is not docked.  With this patch, the system locks up very
early in the boot process, as soon as the console switches from the
compat VGA mode into the higher resolution console mode).

Also, when comparing an unpatched 3.12 kernel with an unpatched 3.13
kernel, 3.13 is also worse with the T540p.  With the unpatched 3.12
kernel, I can have the laptop in the dock, and so long as there are no
external monditors hooked up via the dock video connectors, it worked
fine.   With the unpatched 3.13 kernel, it's fine outside of the dock,
but if it is in the dock, even if the dock does not have any external
video monitors hooked up, any time there is any change to the video
setup (i.e., X server starts up, DPMS puts the monitor to sleep, etc.)
the system will lock up.  It will recover after I eject the laptop from
the dock, and after that point I can redock it, but while the system is
locked up, the laptop heats up and the fan starts up --- which I suspect
means that we are indeed hanging in some spinlock.

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https://bugs.launchpad.net/bugs/1275794

Title:
  Lenovo T440s freezes when connected to docking station

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  This bug report looks to be for the same issue:
  https://bugs.freedesktop.org/show_bug.cgi?id=71267

  I came across the above bug report here:
  https://bbs.archlinux.org/viewtopic.php?pid=1374408

  I'm running with a Thinkpad T440s and ultra dock with hdmi<->hdmi.  In
  my case if I dock when hdmi is connected to the dock, the mouse and
  keyboard freeze once connected.  When I undock they unfreeze.  If I
  dock when hdmi is not connected to the dock, the mouse and keyboard
  don't freeze.

  Ubuntu release: 14.04 Trusty Tahr (development branch)
  --- 
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  corey      2385 F.... pulseaudio
   /dev/snd/controlC0:  corey      2385 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=12d1435c-d652-4aab-8da6-3b043f3da722
  InstallationDate: Installed on 2014-01-31 (3 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140130)
  MachineType: LENOVO 20AQCTO1WW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-5-generic.efi.signed root=UUID=d17999de-2672-48e5-b628-403d311d3251 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-5-generic N/A
   linux-backports-modules-3.13.0-5-generic  N/A
   linux-firmware                            1.123
  Tags:  trusty
  Uname: Linux 3.13.0-5-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip kvm libvirtd lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/10/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET67WW (2.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGJET67WW(2.17):bd12/10/2013:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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