- Status Closed
- Percent Complete
- Task Type Bugs
- Category Drivers
- Assigned To No-one
- Operating System iPod Nano 2G
- Severity High
- Priority Very Low
- Reported Version Release 3.7.1
- Due in Version Undecided
-
Due Date
Undecided
- Votes
- Private
FS#11911 - issues with nano 2g display
As reported in http://forums.rockbox.org/index.php/topic,27098.0.html there were issues with the nano 2g LCD reported (see Forum thread or attachment for a photo).
The following information has been collected so far:
revisions
working → r25375-100328
non-working → current (something after the latest speed optimizations)
LCD type
From diagmode it shows:
LCD Detect0:1
LCD Detect1:0
Also in hardware debug:
LCD:
type: 1, (7) LDS176
01275881255491863787.jpg
Closed by Buschel
2011-04-22 20:42
Reason for closing: Fixed
Additional comments about closing: Warning: Undefined array key "typography" in /home/rockbox/flyspray/plugins/dokuwiki/inc/parserutils.php on line 371 Warning: Undefined array key "camelcase" in /home/rockbox/flyspray/plugins/dokuwiki/inc/parserutils.php on line 407
2011-04-22 20:42
Reason for closing: Fixed
Additional comments about closing: Warning: Undefined array key "typography" in /home/rockbox/flyspray/plugins/dokuwiki/inc/parserutils.php on line 371 Warning: Undefined array key "camelcase" in /home/rockbox/flyspray/plugins/dokuwiki/inc/parserutils.php on line 407
Fixed with r29764.
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I took a quick look in there out of curiosity and I found it odd that it does no clipping of drawing parameters.
Michael, can you explain in more detail what you found in the code?
Another hint might be
FS#11997. As the above image shows a working status bar I am not covinced that this is a driver issue. Maybe it is an effect of viewports?Just that really. I don’t know the code very well but other drivers clip and out of range parameters would cause bad register values as well as invalid framebuffer addresses. My own initial strategy would be to just put some clipping code in there and see since code assumes the driver will clip the screen updates. If that didn’t solve the problem, I’d still leave the clipping code there since then you know that won’t be a continuing possibility and keep trying whatever came to mind.
Two more reports:
http://forums.rockbox.org/index.php/topic,27777.0.html http://forums.rockbox.org/index.php/topic,27813.0.html
The issue could be reproduced and the underlying cause was identified as insufficient voltage supply of the LCD. A voltage supply of 2.8V was tested and verified to be sufficient for one of the users with a problematic iPod nano 2G.
The change which lowered the voltage supply from 3.0V (Apple OF) to 2.6V (svn before r29764) was submitted to get rid of a buzz noise that the LCD is generating. With the new 2.8V setting this buzz is still significantly lower as with Apple OF.