Changing Vita Brightness to 0 - Bricked when screen off?

[Codiak101]

Hey, I have a question on changing the Vita brightness registry setting to 0 (working on an app that allows it to be changed). I read that it turns the screen off, does this mean it becomes unusable and therefore brick the Vita? Just wondering if I should prevent my app setting this.

One use of this could be when playing the Vita in dock mode. I know the plugin has an option where it turns off the screen but it turns on again when starting some games, at least for me.

 

[godreborn]

can't say for sure, but the registry of the vita is called the system.dreg. it's in the vd0/registry location iirc. it comes with an ireg that allows you to decompile it. it will be recreated if you do a system restore, so chances are that you can recover with the recovery menu.

 

[DinohScene]

Dumb suggestion: put in a failsafe that restores screen brightness when a shutoff command is detected?

 

[godreborn]

chances are probably likely that screen brightness is ignored in the recovery menu. I know that the recovery menu kinda has its own environment on the ps3, vita, and ps4 (probably ps5 as well), so if you were to say change the font on one of those systems, it wouldn't carry over to the recovery menu.

 

[Codiak101]

I've noticed when it's docked that changing the brightness has no effect on the TV, but still wary to change it to 0 in case it goes off on the TV too.

 

[godreborn]

I found the byte that seems to control brightness after decompiling the system.dreg:

you can decompile it with this:

you need both the dreg and ireg, though it may be easier with the registry editor on the system.

 

[Codiak101]

Thanks for the help, useful program to know about. I was testing this with an FTP connection open ready to restore the registry file if needed, but found that changing the brightness registry doesn't actually take affect unless you change it on the brightness slider. So when I change the registry from low to high and look at the slider it's moved to max but the screen brightness hasn't actually changed, only when I move the slider.

There must be some sort of refresh I can do to apply the new brightness, refreshing live area and suspending/resuming doesn't work - is there a function call I need to add? I tried with Registry Editor too but same issue.

 

[godreborn]

Just fix hashes, which registry editor should do anyway.

 

[Codiak101]

Hey so I've managed to test this properly by opening the brightness in the settings (not the quick menu) which triggers whatever registry setting you have without touching the slider. So when brightness is set to 0 is does indeed turn off the screen but you can still use the touch screen and buttons, I was able to see what I was doing because it was docked and the TV was unaffected. The only way to get the Vita screen back was to increase the brightness slider, luckily I had the FTP connection to restore system.dreg but thankfully didn't need it.

I'm still not sure if there's a better way to apply the registry changes on these settings (so not go into their official settings or restart the device). Sorry I'm not sure what you mean by fixing the hashes? Thanks

 

[godreborn]

Fixreg fixes the hashes of the dreg file.