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RMX
n00b
Joined: 22 Aug 2004
Posts: 66
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 Posted: Mon May 12, 2008 10:10 pm Post subject: [SOLVED] Laptop backlight control |
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Hello,
I can't find how to adjust my HP Pavilion DV6610EN backlight. I have read many HOWTOs and forum post but I still can't get it to work. I have /sys/class/backlight directory, but it's empty. I have included these options to my kernel:
| Code: | CONFIG_BACKLIGHT_LCD_SUPPORT=y
CONFIG_LCD_CLASS_DEVICE=y
CONFIG_BACKLIGHT_CLASS_DEVICE=y
CONFIG_BACKLIGHT_CORGI=y
CONFIG_BACKLIGHT_PROGEAR=y
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Also, I don't have /proc/acpi/video directory. Can anyone help me? I want to adjust brightness for battery economics.
By the way, I noticed that screen is brighter when I unplug the power cable. This is strange, I think it should be otherway.
Last edited by RMX on Wed May 14, 2008 8:27 am; edited 1 time in total |
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Cheesebaron
n00b
Joined: 19 Nov 2006
Posts: 24
Location: DTU, Denmark
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| Posted: Tue May 13, 2008 8:27 am Post subject: |
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Try enabling
CONFIG_BACKLIGHT_LCD_SUPPORT
CONFIG_BACKLIGHT_CLASS_DEVICE
EDIT: Oh wait you did.
EDIT EDIT: This might be a stupid question. But do you even have acpid installed?
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ThinkPad X60t | Gentoo ~x86 | Zen-sources |
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RMX
n00b
Joined: 22 Aug 2004
Posts: 66
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| Posted: Tue May 13, 2008 1:07 pm Post subject: |
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| Yes, I have acpid and it's running. I can see battery's status and so on. When I close the lid, backlight automatically turns off. |
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danvari
Tux's lil' helper
Joined: 04 Apr 2008
Posts: 130
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| Posted: Tue May 13, 2008 1:42 pm Post subject: |
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| did you activate acpi-video support into the kernel? your directory is empty so it might not be activated in the kernel. you will need that to control the backlight. if you cannot activate acpi-video (maybe it is not listed in the acpi section), then you have to activate some lcd brightness stuff in the kernel. |
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Wojtek_
Guru
Joined: 28 May 2006
Posts: 397
Location: London
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| Posted: Tue May 13, 2008 2:02 pm Post subject: |
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I have exactly the same problem. I tried booting Ubuntu Hardy LiveCD and I can adjust the brightness easily using Fn keys and/or the gnome brightness applet. Can it be caused that the liveCD uses open xorg-ati-driver whereas I have fglrx on my Gentoo installation?
Cheers,
Wojtek
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Fujitsu-Siemens Amilo Xi-1546
Intel Centrino Duo T2600 (2,16GHz)
2x1GB DDR2 RAM
ATi Mobility Radeon X1800 256MB DDR3
2x120GB HDD
Intel High Definition Audio |
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RMX
n00b
Joined: 22 Aug 2004
Posts: 66
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| Posted: Tue May 13, 2008 2:20 pm Post subject: |
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| danvari wrote: | | did you activate acpi-video support into the kernel? your directory is empty so it might not be activated in the kernel. you will need that to control the backlight. if you cannot activate acpi-video (maybe it is not listed in the acpi section), then you have to activate some lcd brightness stuff in the kernel. |
Well I can't find that in kernel's menuconfig. When I press / and type acpi_video, I see:
| Quote: | Symbol: ACPI_VIDEO [=n]
│ Prompt: Video
│ Defined at drivers/acpi/Kconfig:137
│ Depends on: !X86_VOYAGER && ACPI && X86 && BACKLIGHT_CLASS_DEVICE &&
│ Location:
│ -> Power management options
│ -> ACPI (Advanced Configuration and Power Interface) Support (ACP
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But I can't find it in the menu. Maybe because it says Depends on: !X86_VOYAGER && ACPI && X86 && BACKLIGHT_CLASS_DEVICE && and my processor is x86_64? |
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Wojtek_
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Joined: 28 May 2006
Posts: 397
Location: London
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| Posted: Tue May 13, 2008 6:06 pm Post subject: |
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I managed to get brightness working by selecting VIDEO_OUTPUT_CONTROL && INPUT (ACPI_VIDEO showed up after selecting them). After rebooting the kernel I can regulate screen brightness using Fn keys and brightness panel (which never worked before). Thanks for help.
Cheers,
Wojtek
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Fujitsu-Siemens Amilo Xi-1546
Intel Centrino Duo T2600 (2,16GHz)
2x1GB DDR2 RAM
ATi Mobility Radeon X1800 256MB DDR3
2x120GB HDD
Intel High Definition Audio |
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RMX
n00b
Joined: 22 Aug 2004
Posts: 66
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| Posted: Tue May 13, 2008 7:17 pm Post subject: |
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Oh, I had to select VIDEO_OUTPUT_CONTROL, everything works now.
Thank you. |
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Wojtek_
Guru
Joined: 28 May 2006
Posts: 397
Location: London
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| Posted: Tue May 13, 2008 7:30 pm Post subject: |
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Please add [SOLVED] to the topic then.
Cheers,
Wojtek
_________________
Fujitsu-Siemens Amilo Xi-1546
Intel Centrino Duo T2600 (2,16GHz)
2x1GB DDR2 RAM
ATi Mobility Radeon X1800 256MB DDR3
2x120GB HDD
Intel High Definition Audio |
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RMX
n00b
Joined: 22 Aug 2004
Posts: 66
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| Posted: Wed May 14, 2008 8:28 am Post subject: |
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Oh, sorry, I forgot that  |
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Desktop Environments
