Acer C720P Automatic Screen Brightness?

BultiZ · 2014-10-01 17:35:05

Hello dear archers, i got an pretty slick setup on my Acer C720P.

Arch Linux x64
Chromebook kernel (aur)
BTRFS
Gnome 3.14

Got about everything to work except Touchscreen in google-chrome

But now to the problem, on ChromeOS you can get automatic brightness by using that sensor the laptop has.. would it be possible to do something like that in arch too? cause it would probly increase the battery life by huge means for me

(Yes ive searched loads on google and the C720/C720P thread here..

Regards. BultiZ

SolarBoyMatt · 2014-10-01 17:59:53

The most discussion there's been on this is on this page of the C720 thread and the next page or so.

From what I can tell the sensor module needs to be enabled in the kernel config and built as a module, since it's still in the staging tree. But as far as I know, nobody has currently gone much further with getting it to work, than that. Feel free to try what's suggested on that page, and report your results. I haven't used Gnome in a long time, so I'm not sure if it has any way of using light sensors for backlight adjustment or not.

Last edited by SolarBoyMatt (2014-10-01 19:08:46)

BultiZ · 2014-10-01 19:36:09

Hummff i guess i will check some more in the thread again then... but ppl using kernel 3.17? wheres that from? source + manual patches?

SolarBoyMatt · 2014-10-01 19:41:09

linux-mainline in the AUR is currently on the 3.17 branch, so that is the easiest way to use it. You will have to end up recompiling the kernel with ABS + makepkg to test any of this, so I would recommed reading up on the wiki pages that cover this, if you're unfamiliar with the process.

BultiZ · 2014-10-01 20:29:35

hummff oh that ordinary linux-mainline, there is one for chromebook with i guess built in modules.. but i guess i will have to read some more cause failing compiling kernel isnt so fun since it takes some hrs on this hardware

BultiZ · 2014-10-01 20:43:22

Got any list of modules and other things that will be needed to add too linux-mainline for it to work?

SolarBoyMatt · 2014-10-01 20:56:08

For linux-mainline the EHCI modules need to be disabled for suspend to function properly. Just disable the ones mentioned in this post.

https://bbs.archlinux.org/viewtopic.php … 8#p1452248

Other than that, everything else should work out of the box on 3.17 on the C720.

BultiZ · 2014-10-01 22:02:30

SolarBoyMatt wrote:

For linux-mainline the EHCI modules need to be disabled for suspend to function properly. Just disable the ones mentioned in this post.
https://bbs.archlinux.org/viewtopic.php … 8#p1452248
Other than that, everything else should work out of the box on 3.17 on the C720.

damn ur great is there any smart way of doing that so that the settings stick when updating with like yaourt?

Last edited by BultiZ (2014-10-01 22:03:16)

SolarBoyMatt · 2014-10-02 13:55:42

I would avoid using yaourt to build the kernel, since it uses /tmp as it's build directory, and the C720 doesn't have enough RAM for that. I keep linux-mainline's source and such in it's own directory in my /home, and when there's an update I just manually update the version number in the PKGBUILD, and re-run makepkg to fetch and build the new source.

BultiZ · 2014-10-06 05:28:48

SolarBoyMatt wrote:

I would avoid using yaourt to build the kernel, since it uses /tmp as it's build directory, and the C720 doesn't have enough RAM for that. I keep linux-mainline's source and such in it's own directory in my /home, and when there's an update I just manually update the version number in the PKGBUILD, and re-run makepkg to fetch and build the new source.

yeah i know that, so i have changed my yaourt tmp to a folder in /home.. maybe not optimal, but the packeges i get from AUR wouldnt compile in /tmp anyway since they are big too

So any tips on how to make the above question work?

SolarBoyMatt · 2014-10-06 13:58:48

Honestly I don't know of a way, but a few days ago I rebuilt linux-mainline-chromebook from the AUR against the then current 3.17rc7 and enabled this module as part of the build. See my post here: https://bbs.archlinux.org/viewtopic.php … 4#p1462894

BultiZ · 2014-10-08 00:43:37

i guess ill just add "linux-mainline-chromebook" to my system and hope that you will update it atleast sometime again thx!

BultiZ · 2014-10-08 01:16:04

BultiZ wrote:

i guess ill just add "linux-mainline-chromebook" to my system and hope that you will update it atleast sometime again thx!

And now back to the "problem" how do i add Automatic screen brightness in gnome 3.14, im building the kernel now with sensor module

Arch Linux

#1 2014-10-01 17:35:05

Acer C720P Automatic Screen Brightness?

#2 2014-10-01 17:59:53

Re: Acer C720P Automatic Screen Brightness?

#3 2014-10-01 19:36:09

Re: Acer C720P Automatic Screen Brightness?

#4 2014-10-01 19:41:09

Re: Acer C720P Automatic Screen Brightness?

#5 2014-10-01 20:29:35

Re: Acer C720P Automatic Screen Brightness?

#6 2014-10-01 20:43:22

Re: Acer C720P Automatic Screen Brightness?

#7 2014-10-01 20:56:08

Re: Acer C720P Automatic Screen Brightness?

#8 2014-10-01 22:02:30

Re: Acer C720P Automatic Screen Brightness?

#9 2014-10-02 13:55:42

Re: Acer C720P Automatic Screen Brightness?

#10 2014-10-06 05:28:48

Re: Acer C720P Automatic Screen Brightness?

#11 2014-10-06 13:58:48

Re: Acer C720P Automatic Screen Brightness?

#12 2014-10-08 00:43:37

Re: Acer C720P Automatic Screen Brightness?

#13 2014-10-08 01:16:04

Re: Acer C720P Automatic Screen Brightness?

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