T440p 20AWS02A00 and (Arch)Linux compatibility

king.flasher.dave · 2014-01-16 17:37:43

Hmm, had to switch for a W540 because of expresscard, etc. No more input from my side regarding this laptop. Worked like a charm tho!

LimaSierra · 2014-01-26 16:31:38

Hi all,
For those that are having trouble to keep Fn + BrightnessUp/Down in sync with the slider:

https://bugs.kde.org/show_bug.cgi?id=323516#c24

hth
Regards

abbradar · 2014-01-26 20:05:11

Thanks a lot! Interestingly, I don't need video.brightness_switch_enabled=0 for it to work. Removed acpi_osi, too.

LimaSierra · 2014-01-26 21:14:29

Hi,

Another quick note: with the "new config", I had problems after resuming from suspend. The screen brightness was always set to 100%.

I solved it with the following resume hook (I use the built-in systemd suspend):

#!/bin/sh
case $1/$2 in
  pre/*)
    echo "Going to $2..."
    ;;
  post/*)
    echo "Waking up from $2..."
    echo $(cat /sys/class/backlight/acpi_video0/actual_brightness) > /sys/class/backlight/acpi_video0/brightness
    ;;
esac

in /usr/lib/systemd/system-sleep/yourFileName.sh
Don't forget to chmod a+x , as mentioned here

@abbradar: Which desktop environment do you use? Do you have the same problem?
I have KDE, and in my opinion this could be a KDE-related bug

Regards

abbradar · 2014-01-26 21:25:00

@LimaSierra: I use KDE, and don't have acpi_video{0,1} in backlight at all. I suspect you are using 3.12 kernel -- use_native_backlight option was really added to 3.13 (I use testing since fixes for new laptop models usually arrive quickly to new versions of kernels and stuff and need someone to test them ^_^), and disables acpi_video* completely, so KDE uses intel_backlight.

LimaSierra · 2014-01-26 21:42:55

Oh, you are right....my system is always up-to-date, so I assumed I had the latest kernel, but it turns out 3.13 is not in [core] yet!
Btw: you just answered my next question just before I posted it....I still have acpi_video0/1 but you do not

Thanks

LimaSierra · 2014-01-26 21:45:07

Almost forgot it now.... does the brightness level persist when resuming from suspend, or does it jump to 100%?

Last edited by LimaSierra (2014-01-26 21:47:09)

abbradar · 2014-01-26 21:50:52

I think you would also be able to remove video.brightness_switch_enabled option with new kernel, it works for me ^_^.
Though, there is a new bug with iwlwifi on 3.13 which I've just posted: https://bugzilla.kernel.org/show_bug.cgi?id=69461
WLAN works but with all these errors on boot. I'll stay on 3.13 for further testing and reporting, but I think you can wait if you prefer more stable system ^_^.

(Almost posted but got notified about new message by e-mail) Brightness level is saved correctly through suspends.

Edit: Also, sadly, there is no improvement in the field of nvidia enabling/disabling. I'm investigating this issue in my free time and it gets more and more cryptic. You can check bug report page (https://github.com/Bumblebee-Project/bbswitch/issues/78) for my findings.

Last edited by abbradar (2014-01-26 21:57:27)

abbradar · 2014-01-26 22:31:00

Another bug, with bcache this time, reported at https://bugzilla.kernel.org/show_bug.cgi?id=69471. Haven't seen two regressions at once for a long time, and it looks like USB wireless headset is having glitches, too (requires further testing)... I would recommend to wait for first point release before updating.

eduardowoj · 2014-06-10 12:39:39

T440p here also!

Anyone managed to control the keyboard backlight? I can't even activate mine. Also, anyone knows if it is possible to activate/deactivate the keyboard backlight via the command line?

abbradar · 2014-06-11 19:26:59

Keyboard backlight is controlled though "fn+space" and is independent (and uncontrollable) from OS. Maybe there is an interface, but I haven't seen one even on Windows.

abbradar · 2014-07-10 18:19:45

To all who may be concerned: the problem with nvidia have been solved, so this is no longer an issue to think about: https://github.com/Bumblebee-Project/bb … t-48600484

ntony · 2014-07-18 08:27:34

abbradar wrote:

To all who may be concerned: the problem with nvidia have been solved, so this is no longer an issue to think about: https://github.com/Bumblebee-Project/bb … t-48600484

Wow cool! Anyone has already upgraded BIOS to lates version and tried?

abbradar · 2014-07-18 21:31:00

Hello,
Unfortunately (I'm sorry for the false statement), after some testing (it was obscure, so I or anyone haven't noticed it immediately, and thought that since bumblebee worked everything was "solved"), I found out that it was not fixed, but rather nvidia's disabling was broken, so bumblebee started to "work". You can find more at https://github.com/Bumblebee-Project/bb … t-48768044 .

jakub · 2015-02-20 19:17:26

Hi. Could some please 'refresh' the thread and post how situation with 440p currently does look like? Is it any better? I'm mostly interested how to deal with Optimus under Linux. I've never used it.

Do I have a choice which graphics card I want to use permanently? (by changing settings in BIOS?) If yes - is it a rule or it's laptop specific feature? Or maybe I'm forced to use Optimus under Windows and Bumblebee under Linux?

Could you explain these basic stuff?

Last edited by jakub (2015-02-20 19:19:19)

Arch Linux

#26 2014-01-16 17:37:43

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#27 2014-01-26 16:31:38

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#28 2014-01-26 20:05:11

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#29 2014-01-26 21:14:29

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#30 2014-01-26 21:25:00

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#31 2014-01-26 21:42:55

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#32 2014-01-26 21:45:07

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#33 2014-01-26 21:50:52

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#34 2014-01-26 22:31:00

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#35 2014-06-10 12:39:39

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#36 2014-06-11 19:26:59

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#37 2014-07-10 18:19:45

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#38 2014-07-18 08:27:34

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#39 2014-07-18 21:31:00

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

#40 2015-02-20 19:17:26

Re: T440p 20AWS02A00 and (Arch)Linux compatibility

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