removing the workaround (intel.conf file in
/usr/share/X11/xorg.conf.d/) and booting with the latest vivid kernel
(3.18.0-031800rc7-generic #201411302035) did not fix the problem.
Can someone explain me why the workaround works? Is the brightness
normally handled by the kernel and does my workaround tell the intel
driver to handle it?
Kind regards.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1399611
Title:
Screen brightness not working acer aspire 5742
Status in linux package in Ubuntu:
Confirmed
Bug description:
My laptop does not respond to the screen brightness control after default
Ubuntu install. The following workaround worked: http://askubuntu.com/a/450594
It adds a config file to /usr/share/X11/xorg.conf.d/
adding acpi_backlight=vendor to boot params did nothing
adding acpi_osi=Linux to boot params only fixed the keyboard shortcuts, but
the screen indicator and the brightness settings dialog stopped working.
Please let me know if this is not the right package, or if you need
more info.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-40-generic 3.13.0-40.69
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
Uname: Linux 3.13.0-40-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: lies 2944 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Dec 5 12:06:41 2014
HibernationDevice: RESUME=UUID=36715a89-8cd7-40cd-8d29-94f983036914
InstallationDate: Installed on 2014-11-23 (11 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64
(20140722.2)
Lsusb:
Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 04f2:b1d8 Chicony Electronics Co., Ltd
Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Acer Aspire 5742
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic
root=UUID=1bc3ee22-b016-4fcc-9668-30363b56faa9 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-40-generic N/A
linux-backports-modules-3.13.0-40-generic N/A
linux-firmware 1.127.10
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/11/2010
dmi.bios.vendor: Acer
dmi.bios.version: V1.04
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Aspire 5742
dmi.board.vendor: Acer
dmi.board.version: V1.04
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.04
dmi.modalias:
dmi:bvnAcer:bvrV1.04:bd08/11/2010:svnAcer:pnAspire5742:pvrV1.04:rvnAcer:rnAspire5742:rvrV1.04:cvnAcer:ct10:cvrV1.04:
dmi.product.name: Aspire 5742
dmi.product.version: V1.04
dmi.sys.vendor: Acer
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