toshiba_acpi probably isn't going to help. Most newer models I've looked
at don't support modifying the brightness level via the interface it
uses, only reading it, and yours doesn't appear to be an exception.
Please try the following. First, run these commands:
cat /sys/class/backlight/acpi_video0/max_brightness
cat /sys/class/backlight/acpi_video0/brightness
cat /sys/class/backlight/acpi_video0/actual_brightness
cat /sys/class/backlight/acpi_video0/bl_power
Please provide the output you get from these commands. Then try running
echo n | tee /sys/class/backlight/acpi_video0/brightness
replacing "n" with various values less than or equal to the number you
got from the max_brightness file (you might avoid using 0 in case it
turns off the backlight). Does the backlight level change? If not,
please attach the output of dmesg after writing the values to the
brightness file.
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Seth Forshee (sforshee)
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https://bugs.launchpad.net/bugs/850065
Title:
Brightness control on Toshiba Satellite L755
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