** Tags added: bios-outdated-2.30
** Description changed:
- Backlight control doesn't work in Ubuntu 14.04 on a Lenovo Thinkpad T61.
- Neither using hotkeys nor the brightness applet.
+ With nvidia driver, backlight control doesn't work in Ubuntu 14.04 via
+ hotkeys or brightness applet.
+
+ WOR
Okay, I wasn't able to test the nvidia driver with the upstream kernel,
but I tested with another version of the nvidia driver with the stock
kernel. Backlight control works with nvidia 304 driver.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-unable-t
Damn, apparently the nvidia driver is not actualy in use, even thoug
additional drivers tab under software and sources claims it to be in
use. "sudo lshw -c video" gives the following output:
*-display
description: VGA compatible controller
product: G86M [Quadro NVS
No, I was wrong. Tested with upstream kernel 3.14 and backlight control
working with nvidia driver 331.38. Confirms kernel bug bug.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-fixed-upstream
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I removed the nvidia driver (331.38) in order to avoid problems when
installing the upstream kernel. This, however, seemed to fix the issue,
because brightness control is now working with the noveau driver and the
stock kernel. This would mean that this is actually a bug in the
proprietary nvidia d
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.14 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 t
** Attachment added: "video"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061327/+files/video
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Title:
Backlight
** Attachment added: "version"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061326/+files/version
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Title:
Backli
** Attachment added: "ssdt2.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061324/+files/ssdt2.dat
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Title:
Ba
** Attachment added: "fwts"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061321/+files/fwts
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Title:
Backlight co
** Attachment added: "dsdt.dsl"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061320/+files/dsdt.dsl
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Title:
Back
** Attachment added: "ssdt1.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061323/+files/ssdt1.dat
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Title:
Ba
** Attachment added: "dsdt.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061318/+files/dsdt.dat
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Title:
Back
** Attachment added: "backlight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061317/+files/backlight
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Title:
Ba
** Attachment added: "ssdt3.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061325/+files/ssdt3.dat
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Title:
Ba
** Attachment added: "fwts_method"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061322/+files/fwts_method
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Title:
** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061316/+files/acpidump.txt
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Title
** Attachment added: "dmidecode.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061319/+files/dmidecode.log
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