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Bug 578504 - Kernel bisect for: Cannot dim display on laptop anymore
Summary: Kernel bisect for: Cannot dim display on laptop anymore
Status: RESOLVED FIXED
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Core system (show other bugs)
Hardware: x86 Linux
: Normal normal (vote)
Assignee: Gentoo Kernel Bug Wranglers and Kernel Maintainers
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-03-29 11:18 UTC by lebkoungcity
Modified: 2018-03-11 20:48 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


Attachments
bisect.log (piped from 'git bisect') (bisect.log,3.61 KB, text/plain)
2016-03-29 11:18 UTC, lebkoungcity
Details
output of 'git bisect log' (bisect_log-output,3.52 KB, text/plain)
2016-03-29 11:20 UTC, lebkoungcity
Details
emerge --info (file_578504.txt,5.66 KB, text/plain)
2016-03-29 11:20 UTC, lebkoungcity
Details
lspci -v (complete) (file_578504.txt,7.26 KB, text/plain)
2016-03-29 11:22 UTC, lebkoungcity
Details

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Description lebkoungcity 2016-03-29 11:18:48 UTC
Created attachment 429216 [details]
bisect.log (piped from 'git bisect')

Hello,

I have a trouble with adjusting the brightness of the display on my ThinkPad R40. Since updating the kernel last August (I think it was from 3.18.12 to 4.0.5 - both being gentoo-sources) I cannot dim the backlight anymore. The brightness can be switched to it's full level but it can't be dimmed afterwards. The only way to achieve this is to give the command that it should be dimmed and then reboot the machine or switch it to hibernation and recover it from there.

I have started this thread in which I was advised to bisect the kernel:
https://forums.gentoo.org/viewtopic-p-7898434.html

The result is this:

---------------------

146755923262037fc4c54abc28c04b1103f3cc51 is the first bad commit
commit 146755923262037fc4c54abc28c04b1103f3cc51
Author: Jay Lan <jlan@sgi.com>
Date: Mon Sep 29 15:36:57 2014 -0700

kdb: fix incorrect counts in KDB summary command output

The output of KDB 'summary' command should report MemTotal, MemFree
and Buffers output in kB. Current codes report in unit of pages.

A define of K(x) as
is defined in the code, but not used.

This patch would apply the define to convert the values to kB.
Please include me on Cc on replies. I do not subscribe to linux-kernel.

Signed-off-by: Jay Lan <jlan@sgi.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>

:040000 040000 933e89763afe1823fa7ed3980486d396a6a0721b c0993777db35918f12790d5a5662320bb0814a07 M kernel

---------------------


I hope that this is a valide result.

I attach the complete logs incl. emerge --info and I'd be happy to provide more info!
Comment 1 lebkoungcity 2016-03-29 11:20:09 UTC
Created attachment 429218 [details]
output of 'git bisect log'
Comment 2 lebkoungcity 2016-03-29 11:20:57 UTC
Created attachment 429220 [details]
emerge --info
Comment 3 lebkoungcity 2016-03-29 11:22:37 UTC
Created attachment 429222 [details]
lspci -v (complete)
Comment 4 Mike Pagano gentoo-dev 2018-03-05 17:54:54 UTC
Is this still an issue with later kernels?
Comment 5 lebkoungcity 2018-03-11 20:48:35 UTC
No, it works again with recent kernels.

Thanks for asking!