Ubuntu
linux package

  1. Bug #540333
  2. Comment #17

Comment 17 for bug 540333

Revision history for this message
Chase Douglas (chasedouglas) wrote :

It would be helpful to have a trace of the kernel backlight functions. Please run the following:

$ sudo sh -c "echo '*backlight*' > /sys/kernel/debug/tracing/set_ftrace_filter"
$ sudo sh -c "echo function_graph > /sys/kernel/debug/tracing/current_tracer"
$ sudo sh -c "echo 1 > /sys/kernel/debug/tracing/tracing_enbled"
$ sudo sh -c "echo 1 > /sys/kernel/debug/tracing/tracing_on"

Then hit one of the backlight buttons. Now, upload the file /sys/kernel/debug/tracing/trace.

Thanks