This fix works in 3.13.0-24-generic. I hope that this helps someone
else.
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https://bugs.launchpad.net/bugs/1307064
Title:
Ubuntu 14.04 Beta cannot adjust brightness on Lenovo Ideapad Z
Problem solved.
Tried adding acpi_backlight=vendor to boot parameter. Did not work
So I tried the recommendation for Intel HD Graphic Controllers.
Created the file /usr/share/X11/xorg.conf.d/80-backlight.conf with below
contents as recommended.
Section "Device"
Identifier "Intel Graphics"
I think I should elaborate on my previous post.
I have 2 entries in /sys/class/backlight
acpi_video0
intel_backlight
When I use the slider in the brightness applet or the hotkeys to change
the brightness, the value of /sys/class/backlight/acpi_video0 is
changing.
This being the case, I be
I appologize for the poorly written original bug report. I was very
tired and had been working on this for some time.
As mentioned at https://wiki.ubuntu.com/Kernel/Debugging/Backlight, I
think that it may be helpful if I include that I do have entries in
/sys/class/backlight.
I can change brigh
This still exists in the upstream kernel.
I testedlinux-
image-3.15.0-031500rc1-generic_3.15.0-031500rc1.201404131835_amd64.deb
** Tags removed: amd64 apport-bug staging trusty
** Tags added: kernel-bug-exists-upstream
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dmi.board.version: FAB1
> dmi.chassis.asset.tag: Asset Tag
> dmi.chassis.type: 10
> dmi.chassis.vendor: LENOVO
> dmi.chassis.version: 0.1
> dmi.modalias:
> dmi:bvnLENOVO:bvr45CN38WW:bd10/21/2011:svnLENOVO:pn10249RU:pvrIdeapadZ570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO
Public bug reported:
Fresh install of 14.04 on my laptop cannot adjust brightness. When
fn+up arrow or fn+down arrow are used, the indicator in the upper right
hand corner as if the brightness should change, but it does not. Also,
if one tries to use the slider in the power applet, the brightnes
