[Bug 67191] brightness reset to 0 at boot?

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=67191

--- Comment #21 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Bob Raitz from comment #20)
> Explain how to do it, and I will.

Probably the easiest and least intrusive would be to add 'drm.debug=0xe' to
your kernel command line when booting. If you're using grub, you can hit 'e' to
edit the commands before actually booting the kernel. Find the linux boot line,
add that parameter, without the single quotes, to the end. This way, the
setting won't be persistent; if you need it again, you have to repeat this at
each boot.

Once booted, run dmesg and make sure the line with "Kernel command line"
includes the parameter, and attach the output. Thanks.

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