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!
Created attachment 429218 [details] output of 'git bisect log'
Created attachment 429220 [details] emerge --info
Created attachment 429222 [details] lspci -v (complete)
Is this still an issue with later kernels?
No, it works again with recent kernels. Thanks for asking!