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Modifying /etc/default/grub has no effect until you actually regenerate the config. This is another reason why it might have been better to just edit the kernel command line from the bootloader itself.
Unfortunately that still did not work. and some reasaon /etc/default/grub is different than clicking 'e' on boot item. And I pressed ctrl x when I finished editing. I think that was the right combination. It just said that F11 or ctrl e wil boot it
Last edited by powerpoint45 (2014-03-21 01:44:44)
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WonderWoofy wrote:Modifying /etc/default/grub has no effect until you actually regenerate the config. This is another reason why it might have been better to just edit the kernel command line from the bootloader itself.
Unfortunately that still did not work. and some reasaon /etc/default/grub is different than clicking 'e' on boot item. And I pressed ctrl x when I finished editing. I think that was the right combination. It just said that F11 or ctrl e wil boot it
Did you explicitly run
grub-mkconfig -o /boot/grub/grub.cfg
after editing /etc/default/grub? That was what WonderWoofy was saying but you didn't confirm that explicitly.
Mike C
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powerpoint45 wrote:WonderWoofy wrote:Modifying /etc/default/grub has no effect until you actually regenerate the config. This is another reason why it might have been better to just edit the kernel command line from the bootloader itself.
Unfortunately that still did not work. and some reasaon /etc/default/grub is different than clicking 'e' on boot item. And I pressed ctrl x when I finished editing. I think that was the right combination. It just said that F11 or ctrl e wil boot it
Did you explicitly run
grub-mkconfig -o /boot/grub/grub.cfg
after editing /etc/default/grub? That was what WonderWoofy was saying but you didn't confirm that explicitly.
Thanks. before I was only doing
grub-mkconfig
instead of
grub-mkconfig -o /boot/grub/grub.cfg
But it did not fix my issue. and when I try
video.use_native_backlight=1;
it came up with
/etc/default/grub: line 7: video.use_native_backlight=1: command not found
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Thanks. before I was only doing
grub-mkconfig
instead of
grub-mkconfig -o /boot/grub/grub.cfg
But it did not fix my issue. and when I try
video.use_native_backlight=1;
it came up with
/etc/default/grub: line 7: video.use_native_backlight=1: command not found
When I said, edit /etc/default/grub and do grub-mkconfig, I purposefully didn't write the full syntax that goes with grub-mkconfig as it differs between setup. For a standard bios setup the following syntax can work.
grub-mkconfig -o /boot/grub/grub.cfg
You can see if it was successful by reading the output.
For my EFI setup as well as where I store my grub.cfg, my process to update grub is
grub-mkconfig -o /boot/efi/EFI/grub/grub.cfg
followed by a
cp /boot/efi/EFI/grub/grub.cfg /boot/grub/grub.cfg
You should of done something similar during your initial install of grub, unless you installed archbang, manjaro, or other derivatives. Also, these kernel params aren't gauranteed to fix your issue, although it does help a number of folks. Has this worked for you before? For me, it doesn't and backlight is controlled by xbacklight and binding the fn keys to inc/dec brightness.
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I happened to fix my brightness control issue by adding
Section "Device"
Driver "intel"
Option "Backlight" "intel_backlight"
Identifier "card0"
EndSection
into
/etc/X11/xorg.conf.d/20-intel.conf
Thanks for all the help!
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I confirm that on 3.13.0-24-generic kernel using acpi_backlight=vendor kernel parameter the solution to get brightness controls (fn+f8 and fn+f9) working was to adjust Xorg.conf like linux-ka originally pointed out.
Just add Option "Backlight" "intel_backlight" under Section "Device".
With acpi_backlight=vendor setting /sys/class/backlight directory tree changes and you need to inform X11 about this it seems.
I'm using Lenovo X230.
Last edited by azyr (2014-11-14 06:17:11)
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I confirm that on 3.13.0-24-generic kernel using acpi_backlight=vendor kernel parameter the solution to get brightness controls (fn+f8 and fn+f9) working was to adjust Xorg.conf like linux-ka originally pointed out.
Just add Option "Backlight" "intel_backlight" under Section "Device".
With acpi_backlight=vendor setting /sys/class/backlight directory tree changes and you need to inform X11 about this it seems.
I'm using Lenovo X230.
This is a Arch Linux forum, not Ubuntu. There have been many backlight fixes since 3.13, and Arch has 3.17 now.
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This is a Arch Linux forum, not Ubuntu. There have been many backlight fixes since 3.13, and Arch has 3.17 now.
Oh calm down! Not everyone is up-to-date with the forums and news from it.
My own experience using an ATI chip on a HP Envy 6 and the newest kernel (3.17) is that using video.use_native_backlight=1 doesn't work at all. I had to adjust this and instead of a 1 I used a zero at the end. To get my brightness control back I now use: video.use_native_backlight=0
Should I add this information to the wiki page on brightness control?
I hope it helps someone else.
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My own experience using an ATI chip on a HP Envy 6 and the newest kernel (3.17) is that using video.use_native_backlight=1 doesn't work at all. I had to adjust this and instead of a 1 I used a zero at the end. To get my brightness control back I now use: video.use_native_backlight=0
Should I add this information to the wiki page on brightness control?
Yes, I think you should add this to the wiki. It is good innformation!
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Thanks for pointing to the new wiki entry.
My 20-intel looks like this:
Section "Screen" Identifier "Default Screen" DefaultDepth 24 EndSection Section "Device" Identifier "Intel Graphics" Driver "intel" # Option "AccelMethod" "uxa" Option "AccelMethod" "sna" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0" EndSection
my Kernel parameter looked like this:
linux /vmlinuz-linux root=UUID=xyz cryptdevice=/dev/sda3:home rw quiet resume=/dev/sda2 resume_offset=208896 acpi_osi=Linux acpi_backlight=vendor video.use_native_backlight=1
While booting the screen brightness decreases to maybe 40%. But I still cannot change it with FN+F8/F7.
I booted linux-3.13.5-1.
What's wrong with the setup?
what the exact difference between acpi_backlight option different parameters.
I didn't get the information says.
Could you give some explanation with one example
Last edited by czg (2023-03-19 07:39:25)
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Please don't necrobump a 9 year old thread for a question only tangentially related to what you're asking.
Closing.
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