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#1 2008-04-07 06:43:48
- ibendiben
- Member
- Registered: 2007-10-10
- Posts: 519
udev, uevents and /devices/virtual/backlight/acpi_video0/brightness
During boot when uevents is busy, the backlight or brightness is set to 100.
Is there a way I can set up udev/uevents to make this value 40?
I've looked trough a lot of files trying to locate the setting, but I didn't find anything, the udev files are binaries so I cannot find any code line in there I could change.
udevtrigger -v shows me this line:
/sys/class/backlight/acpi_video0
That is where the setting takes place I assume... But how can I change it?
Should I set up a udev rule for this? How?
100 backlight is much to bright, it hurts your eyes, I'd like to see this setting default to 40 in stead, could this be done?
How can I make the modification of:
/devices/virtual/backlight/acpi_video0/brightness
/sys/class/backlight/acpi_video0/brightness
permanent?
Hope I find any answers!
Thanks in advance...
--Ben
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#2 2008-04-07 07:35:01
- zyghom
- Member
- From: Poland/currently Africa
- Registered: 2006-05-11
- Posts: 432
- Website
Re: udev, uevents and /devices/virtual/backlight/acpi_video0/brightness
cat /etc/rc.local
...
# 6 - lets set up LCD
/bin/echo -n 50 > /sys/class/backlight/acpi_video0/brightness
...Zygfryd Homonto
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#3 2008-04-07 10:10:23
- ibendiben
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- Registered: 2007-10-10
- Posts: 519
Re: udev, uevents and /devices/virtual/backlight/acpi_video0/brightness
cat /etc/rc.local
... # 6 - lets set up LCD /bin/echo -n 50 > /sys/class/backlight/acpi_video0/brightness ...
Not what I mean, thanks anyways
I know how to set the brightness (after boot), but there is this moment at boot, during uevents, when it's being set. I want to know how I could edit the setting there 
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#4 2008-04-07 10:18:40
- zyghom
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- From: Poland/currently Africa
- Registered: 2006-05-11
- Posts: 432
- Website
Re: udev, uevents and /devices/virtual/backlight/acpi_video0/brightness
if you edit files belonging to any package then you will loose it with first upgrade
Zygfryd Homonto
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#5 2008-04-07 12:40:53
- ibendiben
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- Registered: 2007-10-10
- Posts: 519
Re: udev, uevents and /devices/virtual/backlight/acpi_video0/brightness
I know, but is it possible?
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#6 2008-04-08 14:24:09
- ibendiben
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- Registered: 2007-10-10
- Posts: 519
Re: udev, uevents and /devices/virtual/backlight/acpi_video0/brightness
Anyone?
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#7 2008-04-10 16:25:10
- ibendiben
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- Registered: 2007-10-10
- Posts: 519
Re: udev, uevents and /devices/virtual/backlight/acpi_video0/brightness
Not possible?
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#8 2011-01-13 22:28:28
- megawebmaster
- Member
- Registered: 2009-08-12
- Posts: 75
Re: udev, uevents and /devices/virtual/backlight/acpi_video0/brightness
I've got the same problem on Dell 1555. I hadn't got it to some complete reinstall, because of failures with linking libraries. I haven't found solution yet... Maybe someone does?
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