Public bug reported:
All reset methods on a fully updated L702X with BIOS A19 (latest available
release) fail except for the PCI reset through CF9.
This is a regression from the 12.04 LTS kernel, and other OSes (namely, Windows
7) can reboot without problems.
The problem with writing to CF9 is that one of the disks (or both)
perform an emergency head parking before the system resets itself, so
while the system reboots it's less than optimal.
I'm attaching both the disassembled DSDT and the fwts result log (which
itself is inconsistent, since the CPU is running the latest microcode).
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-35-generic 3.13.0-35.62
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
Uname: Linux 3.13.0-35-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: panella 2843 F.... pulseaudio
panella 3347 F.... pulseaudio
CurrentDesktop: KDE
Date: Sat Sep 20 14:34:28 2014
HibernationDevice: RESUME=UUID=7f975fef-305d-4bc7-b61f-3c3efe006fca
InstallationDate: Installed on 2012-04-28 (874 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: Dell Inc. Dell System XPS L702X
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic
root=UUID=d914b486-cf0a-465b-9b10-260738eba9a3 ro reboot=p intel_pstate=enable
RelatedPackageVersions:
linux-restricted-modules-3.13.0-35-generic N/A
linux-backports-modules-3.13.0-35-generic N/A
linux-firmware 1.127.6
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-09-19 (0 days ago)
dmi.bios.date: 09/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A19
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 0XN71K
dmi.board.vendor: Dell Inc.
dmi.board.version: FAB1
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnDellInc.:bvrA19:bd09/07/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn0XN71K:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L702X
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug regression-release trusty
** Attachment added: "ACPI DSDT"
https://bugs.launchpad.net/bugs/1371911/+attachment/4209671/+files/dsdt.dsl
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https://bugs.launchpad.net/bugs/1371911
Title:
[Dell L702X] Reboot fails with all methods except write to CF9
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