FS#424 - Default contrast too dark

Attached to Project: Rockbox
Opened by Anonymous Submitter - Monday, 14 October 2002, 19:25 GMT
Last edited by Daniel Stenberg (bagder) - Friday, 05 December 2003, 09:18 GMT
Task Type Bugs
Category User Interface
Status Closed
Assigned To No-one
Operating System
Severity Low
Priority Normal
Reported Version Release 1.4
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 0
Private No


AJBR20 (upgraded to 40GB).

Installed Rockbox 1.4, replacing 1.3. The 1.4 logo
screen was too dark to read on first boot. By tipping the
unit at an extreme angle, I was able to navigate to the
contrast control and adjust until readable (setting=28).

The problem appears to be too much dynamic range -
the display is getting too light to read at 20, too dark at
34 - the original Archos firmware seems to limit the
adjustment to a "reasonable" range.
This task depends upon

Closed by  Daniel Stenberg (bagder)
Friday, 05 December 2003, 09:18 GMT
Reason for closing:  Wont Fix
Comment by Linus Nielsen Feltzing (linusnielsen) - Monday, 14 October 2002, 20:46 GMT

The LCD's are very different on different units. We have tried hard to have a
default that is at least visible on all models. I wonder what we are doing
Comment by Anonymous Submitter - Tuesday, 15 October 2002, 06:03 GMT

Same thing happened to me, only when i got the contrast
down i took it down to literally 0, and there are still freakish
dark lines running along the display - i took the batteries out
for half an hour and it fixed the problem only to return again
later. is my baby sick :( she's 4 days old
Comment by Anonymous Submitter - Tuesday, 15 October 2002, 07:44 GMT

Hmm... I posted the bug as I didn't notice this problem with
RB1.3, so assumed that something must have changed.
Comment by Linus Nielsen Feltzing (linusnielsen) - Tuesday, 15 October 2002, 07:45 GMT

We changed the default value in 1.4
Comment by Anonymous Submitter - Monday, 28 October 2002, 16:35 GMT

Gotta Agree with the contrast being too dark.

Archos Jukebox Recorder 10.
Factory Firmware: 1.27b
Rockbox: 1.4

A good contrast setting for me is 28.
Comment by Björn Stenberg (zagor) - Tuesday, 26 November 2002, 13:47 GMT

The units differ *A LOT* in contrast, so we can't set a default value that
looks good for everyone.
Comment by Anonymous Submitter - Wednesday, 27 November 2002, 10:19 GMT

Not a big problem. But having such a wide spread implies
that Archos must have a manufacturing setup procedure that
sets the contrast for each unit as it leaves the production
line.... expensive!
Comment by Linus Nielsen Feltzing (linusnielsen) - Wednesday, 27 November 2002, 10:29 GMT

I think the HW info reveals the LCd type and what contrast should be the

Or...our contrast settings function may be

Please give me your results from Menu->Debug->Hw
Comment by Anonymous Submitter - Thursday, 28 November 2002, 08:35 GMT

From my AJBR20:

[Hardware Info]
ROM: 1.26
Mask: 0x0302
USB: positive
ATA: 0x200
PR: positive
Freq: 11.0592MHz
Comment by Anonymous Submitter - Sunday, 01 December 2002, 12:18 GMT

I also found the initial contrast way too dark. My current
setting is 27. The usable range is between 19 and 36 -
beyond those limits the display is completely unreadable.

I have a Recorder 20, ROM version 1.26