Messages in this thread | | | Date | Tue, 11 Jun 2019 15:30:19 -0700 | From | Matthias Kaehlcke <> | Subject | Re: [PATCH v3 3/4] backlight: pwm_bl: compute brightness of LED linearly to human eye. |
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On Tue, Jun 11, 2019 at 09:55:30AM -0700, Brian Norris wrote: > On Tue, Jun 11, 2019 at 3:49 AM Daniel Thompson > <daniel.thompson@linaro.org> wrote: > > This is a long standing flaw in the backlight interfaces. AFAIK generic > > userspaces end up with a (flawed) heuristic. > > Bingo! Would be nice if we could start to fix this long-standing flaw.
Agreed!
How could a fix look like, a sysfs attribute? Would a boolean value like 'logarithmic_scale' or 'linear_scale' be enough or could more granularity be needed?
The new attribute could be optional (it only exists if explicitly specified by the driver) or be set to a default based on a heuristic if not specified and be 'fixed' on a case by case basis. The latter might violate "don't break userspace" though, so I'm not sure it's a good idea.
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