[Bug 81382] Text console blanking does not go away

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81382

--- Comment #9 from Denys Vlasenko <vda.linux at googlemail.com> ---
(In reply to comment #7)
> Ok, this fix work, but cause another problem (tested with 3.15.5+patch and
> 3.16.1).
> 
> When display goes off, backlight goes off.
> When display goes on, backlight is set to MAX.
> When display goes off again, backligh remains MAX.
> After pressing key, LCD works, backlight stay at MAX level.
> When display goes off, backlight is still MAX.

I would say it means that merely treating backlight value of 0 as MAX is not
the best idea.

Maybe we need an additional bool variable "failed to read initial BL value,
don't ever try to set it", set it if initial read of BL value is 0, and if it
is set, never try to change BL level?

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