fix work for me as shown on:
Will Gilthorpe (will-gilthorpe) wrote on 2014-04-18:#8
My machine was a:
Ubuntu 12.04.5
kernel 3.13.0-27
Lenovo B40-30
thanks!!
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[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete = Expired
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https://bugs.launchpad.net/bugs/1307064
Still present on Ubuntu 14.04 64
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Title:
Ubuntu 14.04 Beta cannot adjust brightness on Lenovo Ideapad Z570
To manage notifications about this
This might be related to bug 1324529. On my Lenovo T530, there is only
thinkpad_screen in /sys/class/backlight. The fixes suggested here (the
acpi_backlight=vendor and 80-backlight.conf) do not fix the issue for me
and echoing numbers into /sys/class/backlight/thinkpad_screen/brightness
does
*** This bug is a duplicate of bug 1098216 ***
https://bugs.launchpad.net/bugs/1098216
** This bug has been marked a duplicate of bug 1098216
Regression in brightness control on Lenovo Thinkpad X230 (+tablet) and X1
Carbon
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** This bug is no longer a duplicate of bug 1098216
Regression in brightness control on Lenovo Thinkpad X230 (+tablet) and X1
Carbon
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Title:
I had the exact same problem as Will describes with an Asus eeepc 1001P
and his fix in comment #8 worked.
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Title:
Ubuntu 14.04 Beta cannot
I have a similar problem with a lenovo x230 recently upgraded from 13.10
to 14.04 and lost backlight control both with hot keys and using gnome
settings (this is ubuntu GNOME). Fix in the x11 conf doesn't work for
me. I have two entries in my /sys/class/backlight
intel_backlight and
Thanks, it works on Lenovo B580 but only in combination of both
acpi_backlight=vendor and 80-backlight.conf.
Minor issue is screen switching off on minimum brightness but it doesn't bother
me.
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Thanks Will, this helped.
The acpi_backlight=vendor fix in grub worked for me in 13.04 and 13.10, but
stopped working in 14.04.
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Title:
Ubuntu
This fix works in 3.13.0-24-generic. I hope that this helps someone
else.
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Title:
Ubuntu 14.04 Beta cannot adjust brightness on Lenovo Ideapad
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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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
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
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
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.15 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix
Will do. Will post results as soon as I can. May not be until tomorrow.
On Tue, Apr 15, 2014 at 10:24 AM, Joseph Salisbury
joseph.salisb...@canonical.com wrote:
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please
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