useless brightness slider

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pinkytoes
Simple Hen
Posts: 56
Joined: Sun Mar 02, 2014 20:06

useless brightness slider

Post by pinkytoes » Mon Mar 10, 2014 0:45

the system tray pulldown has a volume slider which works fine
and a brightness slider that appears to do nothing at all.
any ideas?
Last edited by pinkytoes on Tue Apr 29, 2014 13:55, edited 1 time in total.
Sabayon GNOME (64bit Steam) on acer v5 571p (also e1-572p)

pinkytoes
Simple Hen
Posts: 56
Joined: Sun Mar 02, 2014 20:06

Re: ornamental brightness slider

Post by pinkytoes » Tue Apr 29, 2014 0:18

so several updates have managed to break my wifi
but so far none of them seem to have fixed the slider
that controls screen brightness in the system tray.
is there some setting i need to change to make it work?
Sabayon GNOME (64bit Steam) on acer v5 571p (also e1-572p)

Honeyman
Growing Hen
Posts: 159
Joined: Sun Apr 08, 2012 2:25
Location: Berlin, Germany

Re: useless brightness slider

Post by Honeyman » Tue Apr 29, 2014 17:48

Which desktop environment are you talking about, GNOME shell? There is a slider for settings the brightness of your display. I am not familiar with other desktops (KDE, XFCE, LXDE, Cinnamon) maybe they have a slider for that too. Please give some more details about the system you are using so someone can help you.
Je me regarde pour me désoler,
je me compare pour me consoler

Maurice de Talleyrand

pinkytoes
Simple Hen
Posts: 56
Joined: Sun Mar 02, 2014 20:06

Re: useless brightness slider

Post by pinkytoes » Tue Apr 29, 2014 18:31

sorry i should make a sig with my hw/sw specs on it
viewtopic.php?f=86&t=31483

i just installed Sabayon GNOME (64bit) on my acer v5 571p

the problem is not a lack of slider, but the lack of change affected by it
the system tray pulldown slider, power saving slider, keyboard hotkeys.
all have zero effect on the brightness of the flourescent behind my monitor.
which is fine most of the time, but around twilight it's a headache maker.
Last edited by pinkytoes on Wed May 07, 2014 16:33, edited 1 time in total.
Sabayon GNOME (64bit Steam) on acer v5 571p (also e1-572p)

ashtophet
Baby Hen
Posts: 1
Joined: Fri May 02, 2014 7:40

Re: useless brightness slider

Post by ashtophet » Fri May 02, 2014 7:54

Hi,
To help isolate the problem, could you try to change the brightness manually, e.g.:
As root.
Maintain a terminal with (assuming systemd) journalctl -f output to see if there are relevant kernel messages:

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journalctl -f

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cat /sys/class/backlight/intel_backlight/brightness

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echo 2000 > /sys/class/backlight/intel_backlight/brightness && cat /sys/class/backlight/intel_backlight/brightness
Please, provide the results.

If you are running a kernel from 3.13 series (latest revisions), I've been experiencing a similar problem here which was solved by switching to a 3.14 one.

pinkytoes
Simple Hen
Posts: 56
Joined: Sun Mar 02, 2014 20:06

Re: useless brightness slider

Post by pinkytoes » Mon May 12, 2014 17:51

@ashtophet
i think this is what you meant:

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# cat /sys/class/backlight/intel_backlight/brightness
976
# echo 2000 > /sys/class/backlight/intel_backlight/brightness && cat /sys/class/backlight/intel_backlight/brightness
bash: echo: write error: Invalid argument

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fprintd[6719]: ** Message: D-Bus service launched with name: net.reactivated.Fprint
fprintd[6719]: ** Message: entering main loop
gdm-password][6724]: gkr-pam: unlocked login keyring
gdm-password][6724]: gkr-pam: unlocked login keyring
gdm[2728]: GdmSlave: could not fetch type of session 'c1': No such file or directory
gnome-session[2994]: (process:6737): GLib-CRITICAL **:
 g_slice_set_config: assertion 'sys_page_size == 0' failed
fprintd[6719]: ** Message: No devices in use, exit
Sabayon GNOME (64bit Steam) on acer v5 571p (also e1-572p)

pinkytoes
Simple Hen
Posts: 56
Joined: Sun Mar 02, 2014 20:06

Re: useless brightness slider

Post by pinkytoes » Mon Jun 16, 2014 0:58

so after the latest few updates, i now have
six items in my system tray pulldown

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Volume
Brightness
Wifi
Location
Bluetooth
Battery
five of which work perfectly.
any breakthroughs over here?
Sabayon GNOME (64bit Steam) on acer v5 571p (also e1-572p)

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