Set system poweroff screensaver on PocketBook ereaders

[datanoise]

Hi.

I'm looking for a way to change the poweroff screensaver on my PocketBook ereader so that when I use Koreader the screensaver is the cover of the book I'm currently reading with koreader, rather than the last one opened by pocketbook's reader.

I found a .lnk (microsoft link) in system/logo/ called "bookcover.lnk" that indicates the path to the last cover image to use.

It would be rather easy to change this link to the image created by koreader: there are bash scrips to create .lnk files that could be easily run on the PB.

My question is: what would be the easier (and cleanest!) way to launch a command each time koreader is started or (even better) is there already a way to easily have koreader change the system poweroff screensaver?

Found this github issue, seems like the way PB handles the screensaver changed in last firmwares (an image in /mnt/ext1/system/logo/bookcover won't necessarily be used as the cover once the device is shut down, but the img linked by bookcover.lnk will).

Thanks!

[Frenzie]

Depending a little on the format it wants it'd be easy enough to write an image but if anything had changed the issue probably would've too. Especially note https://github.com/koreader/koreader...ment-515538113

[datanoise]

I noticed, thanks for your answer.

That's why a more generic way to launch a command when opening a file would make it easy to hack something (it's pretty easy to modify the .lnk file to point it to koreader's latest cover). Modifying the launcher could be a solution but I'd have preferred something cleaner...

[pazos]

Originally Posted by datanoise

Hi.

My question is: what would be the easier (and cleanest!) way to launch a command each time koreader is started or (even better) is there already a way to easily have koreader change the system poweroff screensaver?

The easiest is not the cleanest. Both would require a PB to tinker with and some free time.

The cleanest (I dunno if this is possible on Pocketbook): figure out a way to stop the framework (aka inkview) to react to both input events (power key and magnetic cover) and figure out a way to tell inkview to go to sleep. If you find a way to do both you can repurpose all screensaver logic and it will behave as it does on kobos.

The easiest way would be a plugin that generates a cover for each new book opened. You could repurpose part of screensaver logic but need to do a few things yourself, namely:

- add logic to skip books without covers (a fallback image?)
- check if the image was written to disk
- check for FW incompatibilities and do nothing if the FW has other ways to write the screensaver.
- ...

[datanoise]

Thanks for your insight...

More complicated than I expected. I'll see if I can find some time to experiment with that...

[jospalau]

Just in case someone is interested. Configure KOReader to save cover in:
/mnt/ext1/system/resources/Line/taskmgr_lock_background.bmp

And make a little modification in KOReader code to kill the process taskmgr.app in the init method in readerview.lua:

if Device:isPocketBook() then
os.execute("sudo killall taskmgr.app")
end

You need /bin/killall to be in the suoders file