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[Bug 1262797] Re: [Acer Aspire 7740] acer-wmi module hangs laptop for 10 seconds on boot/modprobe


Peter de Kraker, thank you for performing the requested test and the
follow up information. I briefly scanned acer-wmi and didn't see
anything patently obvious code wise as to why this would occur with a
non-OEM provided WiFi chip (although I'm not terribly familiar with it).
Cursorily, the BIOS may have something hardcoded that depends on the
original OEM hardware, which would make sense here. Despite this, what
could be expected if it's not a BIOS bug, is a quirk of some sort that
minimizes or eliminates the 10 second delay.

Hence, the issue you are reporting is an upstream one. Could you please
report this problem through the appropriate channel (I would start with
platform-driver-x86 and CC "Lee, Chun-Yi" <jlee@xxxxxxxx>) by following
the instructions _verbatim_ at

Please provide a direct URL to your post once you have made it so that
it may be tracked.

Thank you for your understanding.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Triaged

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  [Acer Aspire 7740] acer-wmi module hangs laptop for 10 seconds on

Status in “linux” package in Ubuntu:

Bug description:
  When I received this laptop I installed a new half size mini PCIE wireless card (Intel based) I noticed after installing that Ubuntu 13.10 (kernel 3.11.0-14) hangs for 10 seconds early in the boot process. It continues after that.
  The screen freezes and the fans start spinning very hard. The last dmesg line before the pause is a info message about acer-wmi. When modprobing this module after boot the same symptoms occur. Ubuntu hangs, and reacts normally after 10 seconds. So, clearly something is wrong with acer-wmi. Maybe it should not be loaded with this laptop version, or it has a bug in it. I will add a dmesg from a boot with acer-wmi enabled.

  WORKAROUND: I blacklisted acer-wmi in /etc/modprobe.d/blacklist.conf
  and updated initramfs. Now ubuntu boots as it should without hanging.
  No functionality appears to be lost. Bluetooth and wifi work, also the
  volume keys.

  WORKAROUND: When I remove the wireless card or reinstall the old
  original one modprobing acer-wmi finishes immediately and succesfully
  with no hangs.

  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  peter      1729 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=0ef58455-0f7e-412c-865b-a22b63f559d9
  InstallationDate: Installed on 2013-12-19 (0 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Acer Aspire 7740
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic root=UUID=4333334c-62c1-414f-8227-e09a5f9da742 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
   linux-restricted-modules-3.11.0-14-generic N/A
   linux-backports-modules-3.11.0-14-generic  N/A
   linux-firmware                             1.116
  Tags:  saucy
  Uname: Linux 3.11.0-14-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo
  dmi.bios.date: 07/29/2010
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.27
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Aspire 7740
  dmi.board.vendor: Acer
  dmi.board.version: V1.27
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.27
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.27:bd07/29/2010:svnAcer:pnAspire7740:pvrV1.27:rvnAcer:rnAspire7740:rvrV1.27:cvnAcer:ct10:cvrV1.27:
  dmi.product.name: Aspire 7740
  dmi.product.version: V1.27
  dmi.sys.vendor: Acer

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