Brightness of Clip + is very low

[MichaelScofield]

Hello,

how to increase the brightness level of my Clip + ?
My old clip is so much brighter w/o changing anything.
Using the newest Rockbox and firmware version.

Thx  for help in advance.

greez

[Strife89]

http://download.rockbox.org/daily/manual/rockbox-sansaclipplus/rockbox-buildch8.html#x11-1370008.4

It would appear that you cannot adjust the brightness on a Clip+ in Rockbox -- at least, not yet.

However, if/when the option becomes available, you can go to Settings, then General Settings, then Display, and finally Brightness.

[funman]

You can change the contrast in this menu though, perhaps that helps

[torne]

OLEDs (like the Clip's display) don't have a brightness, they only have a contrast setting. The contrast does more or less what you would expect brightness to do on an LCD

[bertrik]

We could of course change the setting into a brightness setting if that's more clear/expected to users.

In that case we would also get a fade in/out effect when turning the display on or off, however the "brightness"/contrast doesn't go all the way down on the clip (the lowest level is still quite bright).

[torne]

It might make sense to call it brightness, yes. The datasheets I've seen for OLEDs refer to it as contrast, but it really just is how strongly the individual OLED elements are driven...

[funman]

The register we change is documented as "contrast" in the SSD1303 datasheet

(why was the topic locked? I unlocked it)

[MichaelScofield]

Thx for unlocking.
I already saw the "contrast" entry in the settings, but it just does nothing.
On my Clip (non +) it's getting much brighter when upping the value.
I really love Rockbox and would be sad to use the default firmware because of this issue  :/

[torne]

Is it noticeably brighter in the original firmware? That would suggest we're initialising the display differently... or do you just mean it's brighter with a different model of Clip?

[MichaelScofield]

It is much brighter with the default firmware.
Here are 2 pics :




Hope you can see the difference on the photos.

[funman]

I already saw the "contrast" entry in the settings, but it just does nothing.

This is the problem then, contrast works as intended on my Clip+ (change the brightness).

The Clip+ has 2 different LCD controllers, perhaps the 2nd controller works differently for the contrast.

Do you have a build environment setup to test patches?

EDIT: there is indeed a difference, in spacing of contrast steps.

Try setting MAX_CONTRAST_SETTING to 250 in firmware/export/config/sansaclipplus.h (You will end with 220 possible settings for contrast, just check that the maximum value works correctly)

[MichaelScofield]

I don't really have a clue where to find the config file you mentioned.
Should I find it when plugging the Clip to my PC ?

[saratoga]

I don't really have a clue where to find the config file you mentioned.
Should I find it when plugging the Clip to my PC ?

No, its in the rockbox source code.  And the answer to "Do you have a build environment setup to test patches?" would apparently be "No".

[MichaelScofield]

Okay didn't really know that, sorry

//edit : better ? :p

[Chronon]

Please remember to use complete words on these forums.

Thank you.