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Rockbox crashes after USB unplug.

The LCD is highly unreliable: sometimes it displays dots and sometimes it stays black.
Example:
http://forums.rockbox.org/index.php?action=dlattach;topic=13462.0;attach=6384;image

After playing a few opus files (~128 kbps) the system becomes so unresponsive that it cannot decode the file in real time, and the device cannot respond to any input within a reasonable timeframe (have to hard power off).

This does not occur when you set the cpu frequency beyond the highest setting in the debug menu!

To reproduce:
play opus files in a playlist with normal cpu scaling
on beginning of 2nd or 3rd file, system will become unresponsive.

Alarm wakeup doesn’t work reliably. It is unclear whether the setup is wrong or the wake up is. It might be that the player wakes up before time because of a small press on the power button and thus somehow forgets about alarm.

I’m using 42a725f, and after frequency scaling implementation, sometimes the player slowdown extremely, being unusable (don’t stop playing, only small gaps in audio occur).
Less frequently, the player freezes.

I noticed it’s happens more frequently if the device is just powered on, and hits play. If I wait a few seconds before resuming play, the freezes are less frequent.

- How often does this happen?
* Frequently, about 2 o 3 times a day (4 hour average playback time, with several shutdown/boot in the middle)

- playing which file format (mp3, ogg, flac, mpc, etc…)?
* Confirmed with mp3 and flac

- which lcd is your device?
*st7783

This flyspray task will hold the development of a potential usb audio driver for rockbox.
It will also serve for the development of the isochronous transfer support support in usb code.