Re: [gentoo-user] How to dim the display brightness
On Mon, Feb 23, 2009 at 9:57 PM, Damian damian.o...@gmail.com wrote:
Hi Sebastian,
acpi_os-name = Linux as kernel parameter might help.
Ok, I've changed the grub menu.lst file. After the reboot I will write
if something changes.
Nope :(
and take a look if /sys/class/backlight/acpi_video0/ is present:
this is the kernel interface to set the brightness.
I have it, but running
cho 2 /sys/class/backlight/acpi_video0/brightness
has no effect in the display brightness.
CONFIG_BACKLIGHT_LCD_SUPPORT
is the appropriate kernel config category to look at in recent kernels.
Yes, that variable is set.
BTW which kernel are you using?
2.6.27-r2
No doubt: the first dimms the videocard output, the latter the LCD.
I didn't know the reasons for this missmatch, thanks a lot for this
brief but useful explanation.
You can use xev to see which keycode is emmitted and then look in your
desktop environment if this is match with some action.
In fact, Fn + dimming keys produces output. Now, to do something
useful, I need to know how to dim the light of the LCD.
Well. it should be somehow applicable, because it is rather generic.
I don't know how to replace this line
echo level ${LEVEL} /proc/acpi/ibm/brightness
I have a file
/proc/acpi/video/C14B/C160/brightness
whose contents look like
levels: 100 51 30 37 44 51 58 65 72 79 86 93 100
current: 72
I did some echoes to that file, but no luck so far :(
Re: [gentoo-user] How to dim the display brightness
Hello Damian,
and take a look if /sys/class/backlight/acpi_video0/ is present:
On an IBM T61 i have acpi_video1 too. Video0 represents the vga/dvi output
where video1 represents the LCD.
Also have a look on max_brightness on this dirs for the maximum value.
You can use xev to see which keycode is emmitted and then look in your
desktop environment if this is match with some action.
In fact, Fn + dimming keys produces output. Now, to do something
useful, I need to know how to dim the light of the LCD.
As workarround you could switch to a console (Ctrl+Alt+F1) and try to dim with
your fn+ keys.
Well. it should be somehow applicable, because it is rather generic.
I don't know how to replace this line
echo level ${LEVEL} /proc/acpi/ibm/brightness
I have a file
/proc/acpi/video/C14B/C160/brightness
whose contents look like
levels: 100 51 30 37 44 51 58 65 72 79 86 93 100
current: 72
Be careful to touch the right (video-)output. In /proc/acpi/video i have two
devices: VID and VID1. VID1 references to my LCD.
Steffen
Re: [gentoo-user] How to dim the display brightness
Hi Steffen, and take a look if /sys/class/backlight/acpi_video0/ is present: On an IBM T61 i have acpi_video1 too. Video0 represents the vga/dvi output where video1 represents the LCD. Also have a look on max_brightness on this dirs for the maximum value. No, I only have video0. As workarround you could switch to a console (Ctrl+Alt+F1) and try to dim with your fn+ keys. Yes, that's is what I'm currently doing. Be careful to touch the right (video-)output. In /proc/acpi/video i have two devices: VID and VID1. VID1 references to my LCD. Yes, I looked into that folder, but I had no results so far :( I'm still trying ... Thanks for your mail. Best regards, Damian. Steffen
[gentoo-user] How to dim the display brightness
Hi, I cannot find the way to dim the brightness of the display on my laptop. It doesn't seem to be nothing useful in /proc/acpi neither I can find anything in google. I would like the brightness of the screen to be dimmed when the computer is idle for a certain amount of time. Do you have any clues where I can start digging? Thanks in advance, Damian.
Re: [gentoo-user] How to dim the display brightness
Damian ha scritto: Hi, I cannot find the way to dim the brightness of the display on my laptop. It doesn't seem to be nothing useful in /proc/acpi neither I can find anything in google. I would like the brightness of the screen to be dimmed when the computer is idle for a certain amount of time. Do you have any clues where I can start digging? Thanks in advance, Damian. It depends on your video driver. First of all, which video card have you got? -- Antonio Quartulli http://www.ritirata.org/ordex
Re: [gentoo-user] How to dim the display brightness
* Damian (damian.o...@gmail.com) [23.02.09 10:19]: Hi, I cannot find the way to dim the brightness of the display on my laptop. It doesn't seem to be nothing useful in /proc/acpi neither I can find anything in google. Did you enable the apropiate acpi drivers in the kernel? They depend on your laptop model... I would like the brightness of the screen to be dimmed when the computer is idle for a certain amount of time. Do you have any clues where I can start digging? http://www.gentoo.org/doc/en/power-management-guide.xml Thanks in advance, Damian. HTH Sebastian -- Religion ist das Opium des Volkes. Karl Marx s...@sti@N GÜNTHER mailto:sam...@guenther-roetgen.de pgpeTR2b8FPhN.pgp Description: PGP signature
Re: [gentoo-user] How to dim the display brightness
On Mon, Feb 23, 2009 at 12:41 PM, Antonio Quartulli or...@ritirata.org wrote: Damian ha scritto: Hi, I cannot find the way to dim the brightness of the display on my laptop. It doesn't seem to be nothing useful in /proc/acpi neither I can find anything in google. I would like the brightness of the screen to be dimmed when the computer is idle for a certain amount of time. Do you have any clues where I can start digging? Thanks in advance, Damian. It depends on your video driver. First of all, which video card have you got? Indeed. I have an Nvidia Quadro. Sorry for not specifying that. My laptop is a Compaq 8510w. -- Antonio Quartulli http://www.ritirata.org/ordex
Re: [gentoo-user] How to dim the display brightness
On Mon, Feb 23, 2009 at 1:03 PM, Sebastian Günther sam...@guenther-roetgen.de wrote: * Damian (damian.o...@gmail.com) [23.02.09 10:19]: Hi, I cannot find the way to dim the brightness of the display on my laptop. It doesn't seem to be nothing useful in /proc/acpi neither I can find anything in google. Did you enable the apropiate acpi drivers in the kernel? They depend on your laptop model... Yes. But nothing seems to work. I can do it by using nvidia settings, but the dimming is different from the one you get when pressing Fn + the dimming keys on a text console (btw, this is a weird behavior: I cannot do key-based dimming when X is running). http://www.gentoo.org/doc/en/power-management-guide.xml Yep, I looked there, but the example don't apply to my laptop model :( Thanks.
Re: [gentoo-user] How to dim the display brightness
* Damian (damian.o...@gmail.com) [23.02.09 19:21]: On Mon, Feb 23, 2009 at 1:03 PM, Sebastian Günther sam...@guenther-roetgen.de wrote: * Damian (damian.o...@gmail.com) [23.02.09 10:19]: Hi, I cannot find the way to dim the brightness of the display on my laptop. It doesn't seem to be nothing useful in /proc/acpi neither I can find anything in google. Did you enable the apropiate acpi drivers in the kernel? They depend on your laptop model... Yes. But nothing seems to work. acpi_os-name = Linux as kernel parameter might help. and take a look if /sys/class/backlight/acpi_video0/ is present: this is the kernel interface to set the brightness. CONFIG_BACKLIGHT_LCD_SUPPORT is the appropriate kernel config category to look at in recent kernels. BTW which kernel are you using? I can do it by using nvidia settings, but the dimming is different from the one you get when pressing Fn + the dimming keys on a text console No doubt: the first dimms the videocard output, the latter the LCD. (btw, this is a weird behavior: I cannot do key-based dimming when X is running). I think that the Xserver catches this before reaching the hardware. You can use xev to see which keycode is emmitted and then look in your desktop environment if this is match with some action. http://www.gentoo.org/doc/en/power-management-guide.xml Yep, I looked there, but the example don't apply to my laptop model :( Well. it should be somehow applicable, because it is rather generic. Thanks. HTH Sebastian -- Religion ist das Opium des Volkes. Karl Marx s...@sti@N GÜNTHER mailto:sam...@guenther-roetgen.de pgpDrRgkzjcUe.pgp Description: PGP signature
Re: [gentoo-user] How to dim the display brightness
Hi Sebastian,
acpi_os-name = Linux as kernel parameter might help.
Ok, I've changed the grub menu.lst file. After the reboot I will write
if something changes.
and take a look if /sys/class/backlight/acpi_video0/ is present:
this is the kernel interface to set the brightness.
I have it, but running
cho 2 /sys/class/backlight/acpi_video0/brightness
has no effect in the display brightness.
CONFIG_BACKLIGHT_LCD_SUPPORT
is the appropriate kernel config category to look at in recent kernels.
Yes, that variable is set.
BTW which kernel are you using?
2.6.27-r2
No doubt: the first dimms the videocard output, the latter the LCD.
I didn't know the reasons for this missmatch, thanks a lot for this
brief but useful explanation.
You can use xev to see which keycode is emmitted and then look in your
desktop environment if this is match with some action.
In fact, Fn + dimming keys produces output. Now, to do something
useful, I need to know how to dim the light of the LCD.
Well. it should be somehow applicable, because it is rather generic.
I don't know how to replace this line
echo level ${LEVEL} /proc/acpi/ibm/brightness
I have a file
/proc/acpi/video/C14B/C160/brightness
whose contents look like
levels: 100 51 30 37 44 51 58 65 72 79 86 93 100
current: 72
I did some echoes to that file, but no luck so far :(
