Although step 3 at https://wiki.ubuntu.com/Kernel/Debugging/Backlight asks for the output of ls /sys/class/backlight, it gives no output, so I do not include an attachment. Steps 9, 10, and 12–16 either cause no changes or do not apply. Step 11, as noted, is a workaround.
Although step 3 at https:/ /wiki.ubuntu. com/Kernel/ Debugging/ Backlight asks for the output of ls /sys/class/ backlight, it gives no output, so I do not include an attachment. Steps 9, 10, and 12–16 either cause no changes or do not apply. Step 11, as noted, is a workaround.