[Latitude E6220/E6420] Brightness hotkeys are sluggish
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
Medium
|
Unassigned |
Bug Description
Changing the brightness using the brightness hotkeys results in a very slow change. Both the OSD message and the brightness levels take much longer to work then other system's instantaneous changes.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-
ProcVersionSign
Uname: Linux 3.0.0-8-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/pcmC0D0c: ubuntu 1108 F...m pulseaudio
/dev/snd/pcmC0D0p: ubuntu 1108 F...m pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0x3ec60000 irq 43'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:111d76e7,
Controls : 27
Simple ctrls : 13
Date: Wed Aug 17 15:19:23 2011
HibernationDevice: RESUME=
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110815)
IwConfig:
lo no wireless extensions.
eth0 no wireless extensions.
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 003: ID 0a5c:5800 Broadcom Corp. BCM5880 Secure Applications Processor
MachineType: Dell Inc. Latitude E6220
ProcEnviron:
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=
RelatedPackageV
linux-
linux-
linux-firmware 1.59
RfKill:
0: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/28/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: X29
dmi.board.name: 0862D8
dmi.board.vendor: Dell Inc.
dmi.board.version: X00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.
dmi.product.name: Latitude E6220
dmi.product.
dmi.sys.vendor: Dell Inc.
summary: |
- [Latitude E6220] Brightness hotkeys are sluggish + [Latitude E6220/E6420] Brightness hotkeys are sluggish |
Changed in linux (Ubuntu): | |
status: | New → Confirmed |
Changed in linux (Ubuntu): | |
assignee: | Chris Van Hoof (vanhoof) → Li Li (lli5) |
importance: | Undecided → Medium |
Changed in linux (Ubuntu): | |
assignee: | Li Li (lli5) → nobody |
tags: | added: ubuntu-certified |
tags: | added: cscc |
Hi,
I also have latitude E6420. Changing brightness with the FN+Arrow Keys is sluggish and when the automatic brightness adjustment kicks in, the laptop is kind of unusable.
Setting the brightness with intel_backlight command is instantaneous tough.
I wonder how this laptop got ubuntu certified, as it is kind of unusable through auto-brightness adjustment (or can you switch that off?).
Rgds,
Chris