Menu jumping/flickering
Symptoms
When browsing the CHDK menu, the menu's current and previous state flickers back and forth constantly. When outside the menu, CHDK on screen elements (such as the battery display) flicker in a similar manner.
Triggered by (any of the following)
- hybrid auto mode
- face tracking auto focus enabled
- animated drawings on the Canon display
- ...
Workaround
- Avoid the above mentioned modes / settings when browsing the menu
- Only browse the menu in playback mode
The technical cause of this flickering is that CHDK only draws on one of the 2 overlay buffers at any time - the flickering modes switch constantly back and forth between the two buffers where one of the buffers has outdated CHDK drawings.