1179354 - Automatic brightness jumps from A to B without fading gradually or at all

Status: RESOLVED INVALID

(Firefox OS Graveyard :: GonkIntegration, defect)

Description

[Sheeri Cabral [:sheeri]]

Automatic brightness jumps from A to B without fading gradually or at all

Comment 1

[:Atoll]

The brightness slider is nice and gradual and can adjust at a very fine level. The auto-adjust brightness just sharply goes from point A to point B with no transition whatsoever.

Comment 2

[Cervantes Yu [:cyu] [:cervantes]]

This is annoying and I am going to fix it.

Comment 3

[Cervantes Yu [:cyu] [:cervantes]]

It appears that the problem is not in the gaia layer. The same system app is pushed to aries-kk and aries-l, but the 2 devices behaves differently w.r.t. auto brightness. On KK the mapping from [0.1, 1] to actual screen brightness is much smoother than that on L.

Comment 4

[Cervantes Yu [:cyu] [:cervantes]]

Attachment: Brightness mapping test KK vs L

This is a comparison of brightness settings on KK (left) and L (right).
The camera setting is fixed at ISO 200, F2.0, shutter speed 1/125.

From up to down, the brightness is set to minimum, ~45%, ~80%, maximum.

It can be seen that Aries-KK has far more dramatic changes in screen brightness when the setting changes. That means even a small change (0.1, the minimum change we will make in gaia) results in a visible change to the user. Even walking by a lamp, or standing on the escalator, where the artificial light sources results in 0.1 or 0.2 gaia brightness change, will cause pretty visible adjustment of screen brightness and create a feeling of screen flickering.

Comment 5

[Cervantes Yu [:cyu] [:cervantes]]

Unassign from this bug since the problem is very likely to be in the gonk level. We need gonk guys to investigate further.

Comment 6

[David Scravaglieri [:scravag]]

Thomas, is there something you can do on that ?

Comment 7

[Thomas Zimmermann [:tzimmermann] [:tdz]]

(In reply to David Scravaglieri [:scravag] from comment #6)
> Thomas, is there something you can do on that ?

Not before Thursday, but I can that a look later this week.

Comment 8

[Thomas Zimmermann [:tzimmermann] [:tdz]]

ni?'ing myself

Comment 9

[Cervantes Yu [:cyu] [:cervantes]]

To clarify, with bug 1179353 landed, this bug may not be valid. The original problem is that we don't have a smooth transition with auto brightness. The test I made in this bug shows that flame and aries-l has a narrow brightness range, which hides the problem with the screen brightness algorithm to some extent, but it's another problem. Now we should not see an abrupt jump between screen brightnesses so I think we can close this bug.

Comment 10

[Thomas Zimmermann [:tzimmermann] [:tdz]]

Cervantes,

is this bug report still valid?

Comment 11

[Cervantes Yu [:cyu] [:cervantes]]

This bug is no longer valid.