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** Changed in: linux (Ubuntu)
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1243267
Title:
Backlight brightness control doesn't work
Status in linux package in Ubuntu:
Won't Fix
Bug description:
Hello, during a kernel update from 3.11.0-4 up to 3.11.0-9 i've found out
that my brightness controll of my Notebook (Lenovo Thinkpad T430-D17
(nvidia-graphic card, optimus disabled, driver version: 325.15) does not work).
Therefore, i have tried several kernel from kernel.org where all Kernel
provides the backlight control. To get comparable values, i have tried the
kernel version
ubuntu-kernel: Ubuntu 3.12.0-0.2-generic and 3.12.0-rc6
By using the the ubuntu kernel, i wasn't able to control the backlight
brightness but by using the kernel profided by kernel.org works. Therefore, i
began to search the patch lists of ubuntu and find this patch:
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-trusty.git;a=blobdiff;f=drivers/acpi/blacklist.c;h=f49ffaedaefdaa28d533d339a3f5cda073687ed7;hp=9515f18898b2b578053c58309185daa7934cfdda;hb=02cb06962306d96f59bc97ec8289c14b73bafb4e;hpb=2eb9acd1a1deb3f4d6428d022fc43541c9e70069.
I have reverted this patch and the brightness control of my notebook works
fine.
If anybody wants to execute the ubuntu-bug program, you should note,
that i'm not using ubuntu, i'm only using the ubuntu kernel and the
ubuntu-bug program is not in my repositories. Therefore, i supply the
lspci-vnvn report. If any other logs or reports are missing please
feel free to ask me.
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