Hello,
I have a Toshiba Satellite C70D-A-114. It came with Windows 8, but very poor performance lead me to install Debian which has performed much smoother.
Unfortunately, none of the special function keys work after installing Debian. This creates a problem as the laptop being on 100% brightness makes it extremely uncomfortable to use, and I have no way of lowering it.
I have looked at a few solutions but can't seem to make any headway.
xrandr returns "failed to get size of gamma for output default" and /etc/default/grub contains the line 'GRUB_CMDLINE_LINUX_DEFAULT="quiet"'.
I have tried changing 'GRUB_CMDLINE_LINUX_DEFAULT="quiet"' to 'GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" but it seemed to have no effect.'
If anyone might have a solution, please suggest it; I'd love to get this fixed.
Thank you.
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Cannot change brightness / gamma on Toshiba Satellite
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- Head_on_a_Stick
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Re: Cannot change brightness / gamma on Toshiba Satellite
Did you remember to update your GRUB configuration?CountCarrion wrote:I have tried changing 'GRUB_CMDLINE_LINUX_DEFAULT="quiet"' to 'GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" but it seemed to have no effect.'
This will list the currently applied parameters:
Code: Select all
cat /proc/cmdline
deadbang
- stevepusser
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Re: Cannot change brightness / gamma on Toshiba Satellite
Do you have the firmware for your AMD graphics installed?
https://wiki.debian.org/AtiHowTo
If that doesn't have any effect, you could give the proprietary driver a try.
https://wiki.debian.org/AtiHowTo
If that doesn't have any effect, you could give the proprietary driver a try.
MX Linux packager and developer
Re: Cannot change brightness / gamma on Toshiba Satellite
Try "acpi_backlight=video". That worked for me.CountCarrion wrote:I have tried changing 'GRUB_CMDLINE_LINUX_DEFAULT="quiet"' to 'GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" but it seemed to have no effect.'
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