I still experience this bug using Ubuntu 15.04 on the same machine as
before (ThinkPad T420s).
** Changed in: linux (Ubuntu)
Status: Expired => Incomplete
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https://bugs.launchpad.net/bugs/921323
Title:
Display backlight is turned off completely when AC adapter is plugged
in while battery is critically low
Status in linux package in Ubuntu:
Incomplete
Bug description:
If the battery is critically low (so that the Unity battery indicator has
turned red already) and the AC adapter is plugged in, the display backlight is
turned off completely. The screen appears to be completely black, looking at it
closely however reveals that it is still on - without any backlight. Shutting
and reopening the lid as well as shutting it down completely fixes the
condition. This bug occurs reproducibly on a Thinkpad T420s.
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AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: florian 1998 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xf1620000 irq 51'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:14f1506e,17aa21d2,00100002
HDA:80862805,80860101,00100000'
Controls : 21
Simple ctrls : 9
Card29.Amixer.info:
Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw
unknown'
Mixer name : 'ThinkPad EC (unknown)'
Components : ''
Controls : 1
Simple ctrls : 1
Card29.Amixer.values:
Simple mixer control 'Console',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
DistroRelease: Ubuntu 11.10
HibernationDevice: RESUME=UUID=26874031-4fdb-442d-9bc6-f2f89a0a3113
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MachineType: LENOVO 4170CTO
Package: linux (not installed)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-16-generic
root=UUID=83bc2d69-d3b1-42ec-a17f-0b323d98bad0 ro quiet splash
i915.i915_enable_rc6=1 pcie_aspm=force vt.handoff=7
ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
RelatedPackageVersions:
linux-restricted-modules-3.0.0-16-generic N/A
linux-backports-modules-3.0.0-16-generic N/A
linux-firmware 1.60
StagingDrivers: mei
Tags: oneiric running-unity staging
Uname: Linux 3.0.0-16-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 07/11/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8CET46WW (1.26 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4170CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8CET46WW(1.26):bd07/11/2011:svnLENOVO:pn4170CTO:pvrThinkPadT420s:rvnLENOVO:rn4170CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4170CTO
dmi.product.version: ThinkPad T420s
dmi.sys.vendor: LENOVO
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