On Wed, Mar 10, 2021 at 09:56:04PM +0100, Matthias Schwarzott wrote: > > What happens if you set the value to 1000 before running the test? > > > I tested different values. At 1000 it still disconnects. At lower values it > no longer does this. > I tested 200 up to 900. Even 900 ms is good enough to keep it connected. > > Btw. it is not a USB disconnect, but it just seems to plays medium ejected. > > Out of interest I called "sg_start -v -l /dev/sde" after one of the failing > experiments. That made the Kindle go back to connected state. > > To me the above experiments show that enough TEST UNIT READY commands are > needed in the 2 s after a SYNCHRONIZE CACHE. So you have found the solution to your problem. Congratulations! Alan Stern
