On 11/18/2016 11:17 PM, David C. Rankin wrote:
On 11/18/2016 11:02 PM, David C. Rankin wrote:
I've got to get something figured out. This laptop will absolutely blind you when you open a browser, or anything with a white background. I have the backlight set at 40% in win10 and that works well. Here it looks like it is on MAX continually. I will keep at it. If anyone has any other idea, let me know. Thanks.
I don't believe this! I have I can effect the brightness with xrandr, but the output name is 'LVDS-0' instead of 'LVDS' (as it is on my other laptops). I don't know if this could be the whole problem with the normal backlight controls not working -- anyone have any idea? I'll just modify the xbacklight script to call xrandr instead of xbacklight and pass it fractional values between 0.5 and 1.0. Strange indeed.
Here was the ultimate fix for this laptop. Now the brightness adjusts for each press of the up/down brightness keys. It is a variation on the script for xbacklight. It simply transforms the acpi_video0 value into a form that is passed to xrandr. (I would add this to the wiki, but all that I add, is seemingly later removed -- so if it is something that would be helpful in the Backlight wiki, I'll let the wiki master add it) #!/bin/sh path=/sys/class/backlight/acpi_video0 luminance() { read -r level < "$path"/actual_brightness factor=$((100 / max)) brt=$((level * factor)) case "$brt" in [0-9] ) printf "0.%02d" $brt;; [0-9][0-9] ) printf "0.%02d" $brt;; 100 ) printf "1.0";; esac } read -r max < "$path"/max_brightness inotifywait -me modify --format '' "$path"/actual_brightness | while read; do xrandr --output LVDS-0 --brightness $(luminance) done -- David C. Rankin, J.D.,P.E.