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[Colin Ian King <1529381@xxxxxxxxxxxxxxxxxx>]

Verified on Vivid.

Steps used:

1. Hacked seabios to extend FADT to include 64 bit X_* PM registers which pointed to garbage address
2. Boot vivid QEMU VM with old kernel and modified (broken) BIOS
3. Observe kernel failures
4. Install new kernel (3.19.0.49-generic) #55 (Jan 22)
5. Add acpi_force_32bit_fadt_addr to kernel boot line
6. Reboot
7. Observe no kernel failures.
8. Boot with new kernel and original "sane" seabios BIOS
9. Observe no kernel failures.

Looks good to me on Vivid.

** Tags removed: verification-needed-vivid
** Tags added: verification-done-vivid

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https://bugs.launchpad.net/bugs/1529381

Title:
  [HP Compaq 6715s] Updating kernel renders system unbootable

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Vivid:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  [SRU Justification][Vivid][Wily]

  The kernel by default is now using 64 bit addresses from the FADT,
  however, some firmware has legacy 32 bit addresses that are correct
  and 64 bit addresses that are buggy and incorrect.  This results in
  some machines breaking on boot.

  [Fix]
  Add a workaround kernel parameter that forces ACPI to use the 32 bit addresses from the FADT

  [Testcase]
  Without the fix, machine won't boot.  With the fix add "acpi_force_32bit_fadt_addr" to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, roll in the kernel and it will boot

  [Regression potential]
  This fix only twiddles the ACPI global variable acpi_gbl_use32_bit_fadt_addresses if the override flag is used on the kernel, so the regression potential is minimal as one has to force the flag to enable the feature.

  ------------------------------------

  
  To reproduce (on this hardware)

  1) Install 14.04.3 LTS (Ubuntu or XUbuntu)
  2) Install updates
  3) Reboot

  The kernel used after update is 3.19.0-42. Booting with the kernel
  that came with the install image (3.19.0-25) works fine.

  This computer is a HP Compaq 6715s. I have looked at HPs support pages
  for BIOS updates for this model but none was available.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-42-generic 3.19.0-42.48~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-25.26~14.04.1-generic 3.19.8-ckt2
  Uname: Linux 3.19.0-25-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Dec 26 16:36:30 2015
  InstallationDate: Installed on 2015-12-26 (0 days ago)
  InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)
  ---
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=522810df-638a-412b-9aab-791e2e2bc545
  InstallationDate: Installed on 2015-12-26 (0 days ago)
  InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  MachineType: Hewlett-Packard HP Compaq 6715s (RU655ET#AK8)
  Package: linux (not installed)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-25-generic root=UUID=0dd333f9-6172-41eb-9472-a321d48c04eb ro quiet splash
  ProcVersionSignature: Ubuntu 3.19.0-25.26~14.04.1-generic 3.19.8-ckt2
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-25-generic N/A
   linux-backports-modules-3.19.0-25-generic  N/A
   linux-firmware                             1.127.19
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.19.0-25-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  WifiSyslog: Dec 27 13:38:38 michael wpa_supplicant[815]: wlan1: CTRL-EVENT-SCAN-STARTED
  _MarkForUpload: True
  dmi.bios.date: 03/26/2007
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68YTT Ver. F.03
  dmi.board.name: 30C2
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 71.21
  dmi.chassis.asset.tag: CNU7201T8J
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68YTTVer.F.03:bd03/26/2007:svnHewlett-Packard:pnHPCompaq6715s(RU655ET#AK8):pvrF.03:rvnHewlett-Packard:rn30C2:rvrKBCVersion71.21:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Compaq 6715s (RU655ET#AK8)
  dmi.product.version: F.03
  dmi.sys.vendor: Hewlett-Packard

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