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FS#10966 - c200 v1 LCD doesn't turn on when changing Backlight setting from Off to On

Attached to Project: Rockbox
Opened by Daniel Empie (BlastTyrant) - Thursday, 04 February 2010, 21:51 GMT+2
Last edited by Bertrik Sikken (bertrik) - Saturday, 27 February 2010, 12:51 GMT+2
Task Type Bugs
Category LCD
Status New
Assigned To No-one
Player Type Sansa c200
Severity Low
Priority Normal
Reported Version Daily build (which?)
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Private No

Details

As the title states the c200 v1 LCD doesn't turn on when changing the Backlight setting from Off to On. The backlight itself does turn on though. I don't know if this happens with the v2 players.

I first noticed this behavior in r24404 earlier today on my c240. I then updated the player to r24511-100204 and get the same behavior as before. I also get the same behavior in another c240 v1 player that I have which I also updated to r24511-100204. It was previously running r20698-090412 and the backlight didn't turn on when changing the backlight from off to on (I'm guessing that  FS#10130  fixed that problem) - so it happened sometime between that revision and at least as far back as r24404. It might have even carried over from  FS#10130 .

Also, just as a note, I don't notice this behavior in the February 2nd c200 simulator (r24449) - both the backlight and LCD turn on as expected. I checked my v1 Fuze (r24509) also and get normal behavior (backlight and LCD turn on), so this bug might just be limited to the c200 players.
This task depends upon

Comment by Bertrik Sikken (bertrik) - Saturday, 27 February 2010, 12:51 GMT+2
I can confirm this for my c200 v1.

Something similar happens to my e200v1 as well: when switching from off to on, it sometimes (1 in 5 or so) comes up with a completely white screen.
Comment by Benjamin Brown (BenjaminBrown) - Friday, 28 January 2011, 19:34 GMT+2
I can confirm this behavior on my e200 as well.
To produce the bug enter lcd settings backlight scroll up to "off" then back only once to "on" the screen remains all white until the wheel is scrolled farther or another button is pressed. This has a very low importance compared to some other bugs though.
Comment by Benjamin Brown (BenjaminBrown) - Friday, 28 January 2011, 22:45 GMT+2
Thinking further probably caused from the frame buffer getting flushed when the screen is blanked. Free flash light feature?
Comment by Benjamin Brown (BenjaminBrown) - Thursday, 03 February 2011, 17:32 GMT+2
@any_devs: Could this be related to FS#11756?
Comment by Michael Chicoine (mc2739) - Monday, 04 April 2011, 02:58 GMT+2
r23730 is the commit that causes this bug (confirmed on both e200v1 and c200v1)

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