Hi,

> We try to use openocd with an stm32l1x target (discovery) with sleep mode.

I have no experience with these, I tried it with a stm32f4discovery.
 
> We try using DBGMCU_STANDBY | DBGMCU_STOP | DGBMCU_SLEEP in the config
> register without success.

After setting these it worked for me.

Are you sure the registers are really set when you are trying to debug? Maybe 
some other initialization code in your program (e.g. from a library) resets 
them after you wrote them first. Something like this hit me several times.

Try to connect to your device once with openocd and then verify the register 
values from the openocd shell.

Kind regards,

Gerd


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