Ipod nano 2nd gen - white screen

[Buschel]

good. can you please do a simple test and comment line 49 in firmware/target/arm/s5l8700/ipodnano2g/power-nano2g.c ? This is something like "pmu_ldo_set_voltage blabla"..

[siouxes]

WOW... now works! you're a guru!  

i speak to much earlier... when restore from stand by is all white... :-(

OK... the complete behaviour is:

at power on: all works.
go to stand by while hold is off
restore from stand by, for example using the action key: all white.
from all white, is i put hold to on and then to off... all works again...

btw... i am satisfied... for me is acceptable...
tell me if you want to do other tests...

[Buschel]

Really? In fact I didn't expect this, just was an idea as this was one of the early changes to the LCD before v3.7 ...
Nevertheless: Good news!

Now we need to find out how low you can go with the voltage supply. Reason is that my (and other users nano's) make a disturbing humming noise when the voltage is not lowered. Can you try to experiment a bit a see from what voltage on your controller works?

[gbl08ma]

Ha! that Rockbox LCD voltage changes that took place long ago work nicely on most of our devices but not on all the devices... for some reason Apple set the default voltage to the max supported by the displays!

And now? I don't want to have that buzzing sound on the display again! How can this be solved (having all displays working, without buzz sound on most of them).


(Oops: Buschel came first. Here's my post anyways.)

[siouxes]

ok... i'll make some usage test and came back to you as soon as possibile... now i have to go home... i am still in office... here is 22.38 (or 10:38 pm)...

[Buschel]

at power on: all works.
go to stand by while hold is off
restore from stand by, for example using the action key: all white.
from all white, is i put hold to on and then to off... all works again...

You are talking of the LCD standby, right? You can disable this in the settings and keep the LCD switched on all the time (with backlight still switching off). This way you won't experience any of your issues.

Switch on and off hold will call s5l_clickwheel_init() and pmu_ldo_power_on(1) in firmware/target/arm/ipod/button-clickwheel.c Maybe you can find some time to play with those code snippets and find some interesting connections...

[Buschel]

Should be fixed with r29764.

[o_limp]

Hi guys. In my nano 2 gen 2 Gb  white screen after turning off the backlight. Firmware 3.9 for Nano 2. Please suggest a solution. Not easy to Use with backlight on continuously.
Post Merge: August 23, 2011, 03:23:18 AMI installed also the current build r30341, this does not work too. Works correctly only build Version: r28159
Post Merge: August 23, 2011, 01:12:03 PMSince there is no answer, please put a working firmware for the iPod nano version of the above r28159

[Buschel]

Hi,

since r28159 there were several major changes to the nano 2G LCD driver  implemented (sleep mode, massive perfomance increase, ...). It is very hard to debug such issues as there are several different iPod hardwares available...

Step 1) Please enter the iPod's Diagnostic Mode (first press and hold MENU + SELECT until the iPod resets, then -- during the Apple logo -- press and hold BACK + SELECT). In the Diag Mode select "Others", then "Status", then switch to the 2nd page. How are "LCD Detect0" and "LCD Detect1" set?

Step 2) Is it really the "backlight off" which hurts, or the "LCD sleep"? "LCD sleep" means that the LCD is really switched into a special state -- nothing will be visible on the display. You can turn the "LCD sleep" off in the settings menu (see the manual). This way the backlight will go off, but the LCD will not be put to sleep-mode.

Step 3) Did you test all releases (3.6, 3.7, 3.8 and 3.9)?

Step 4) Are you able to compile rockbox on your own? If you are able to compile it will be extremely helpful if you could track down the change which introduced this for you.

[o_limp]

1) LCD Detect0:1
   LCD Detect1:0

2) Is it really "LCD sleep", I had to disable the settings and it worked!
Thank you very much!!!

3) I tested at 3.8 and 3.9

4) Tell me how to correctly compile Roсkbox, give a link where you can read, I myself could not understand.
Need to use SVN? Compile Rockbox in Win7 or only Linux?

Thank you again for your help!!! Sorry for my bad english((
Post Merge: August 23, 2011, 03:26:28 PMI found that the builds r28159 can not view settings Sleep (After Backlight Off). hence in the previous builds had no problems with my Nano2. Thank you again, because I can not live without Rokbox!

[Buschel]

Good to see switching off "LCD sleep" solves your problem. This feature was a major one, with lots of changes. It will be hard to find the cause of the issues with your player.

1) I have the same LCD type, mine works flawless.

2) Switching off "LCD sleep" could be the final solution for you even we will not find the root cause.

3) Ok, as "LCD sleep" is the cause there is no further testing required here. This feature was first delivered with v3.8

4) As a starting point you might take a look at this: http://www.rockbox.org/wiki/DevelopmentGuide I strongly recommend to use a VM-ware with a Linux guest on a Win7 host. Do not use cygwin -- it is far slower and harder to configure.

To be honest: Except you are eager to learn about compiling rockbox and developing some stuff on your own you should stick with the workaorund.