** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1333638
Title:
[Dell Vostro 5470] Unable to control brightness with the Intel GPU /
nVidia GPU + proprietary driver
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
CID: 201307-14038 Dell Vostro 5470
The brightness cannot be adjusted when running on Intel GPU
This bug is similar to bug 1332437, but this one is a I+N system
Steps:
1. Install 14.04 + update (3.13.0-29), boot to desktop
2. Try to adjust the screen brightness with hotkeys and "Brightness and Lock"
applet
Expected result:
* Screen brightness could be adjusted in both ways.
Actual result:
* Unable to control screen brightness, the brightness indicator would change
according to key press on the hotkeys
Debugging information:
ubuntu@201307-14038:~$ ls /sys/class/backlight
acpi_video0 intel_backlight
ubuntu@201307-14038:~$ grep -r . /proc/acpi
/proc/acpi/button/lid/LID0/state:state: open
/proc/acpi/wakeup:Device S-state Status Sysfs node
/proc/acpi/wakeup:P0P1 S4 *disabled
/proc/acpi/wakeup:GLAN S4 *disabled
/proc/acpi/wakeup:EHC1 S4 *enabled pci:0000:00:1d.0
/proc/acpi/wakeup:EHC2 S4 *disabled
/proc/acpi/wakeup:XHC S4 *enabled pci:0000:00:14.0
/proc/acpi/wakeup:HDEF S4 *disabled pci:0000:00:1b.0
/proc/acpi/wakeup:RP01 S4 *disabled pci:0000:00:1c.0
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:RP02 S4 *disabled pci:0000:00:1c.1
/proc/acpi/wakeup:PXSX S4 *disabled pci:0000:02:00.0
/proc/acpi/wakeup:RP03 S4 *disabled pci:0000:00:1c.2
/proc/acpi/wakeup:PXSX S4 *enabled pci:0000:07:00.0
/proc/acpi/wakeup:RP04 S4 *disabled pci:0000:00:1c.3
/proc/acpi/wakeup:PXSX S4 *disabled pci:0000:08:00.0
/proc/acpi/wakeup:RP05 S4 *disabled pci:0000:00:1c.4
/proc/acpi/wakeup:PXSX S4 *disabled
/proc/acpi/wakeup:PEG0 S4 *disabled
/proc/acpi/wakeup:PEGP S4 *disabled
/proc/acpi/wakeup:PEG1 S4 *disabled
/proc/acpi/wakeup:PEG2 S4 *disabled
/proc/acpi/wakeup:LID0 S3 *enabled
ubuntu@201307-14038:~$ dmesg | grep 'ACPI: Video'
[ 4.106881] ACPI: Video Device [PEGP] (multi-head: no rom: yes post: no)
[ 4.121059] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-29-generic 3.13.0-29.53
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ubuntu 1533 F.... pulseaudio
/dev/snd/controlC0: ubuntu 1533 F.... pulseaudio
CRDA:
country TW:
(2402 - 2472 @ 40), (3, 27)
(5270 - 5330 @ 40), (3, 17), DFS
(5735 - 5815 @ 40), (3, 30)
CurrentDesktop: Unity
Date: Tue Jun 24 06:08:39 2014
HibernationDevice: RESUME=UUID=a006ee47-418d-4b00-a823-81ac84d903e4
InstallationDate: Installed on 2010-01-01 (1635 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Dell Inc. Vostro 5470
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic.efi.signed
root=UUID=d578d54f-0310-4907-83ba-ffb8e071368e ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-29-generic N/A
linux-backports-modules-3.13.0-29-generic N/A
linux-firmware 1.127.2
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/02/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias:
dmi:bvnDellInc.:bvrA03:bd10/02/2013:svnDellInc.:pnVostro5470:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Vostro 5470
dmi.sys.vendor: Dell Inc.
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