Hi Michael, On Sun, 2022-10-30 at 22:34 +0200, Michael Zaidman wrote: > The FT260 can enter a power saving mode after being idle for longer than > 5 seconds. > > When being woken up from power saving mode by an I2C write request, it > looks like a possible NACK will not be correctly reported back. As a > workaround, the driver will request an I2C status report before starting > the next I2C transfer if the FT260 has been idle for longer than 4800ms. Unfortunately, I have found issues with this patch as it is. When I tested from an installation running in KVM, I saw missed NACKs again. A possible fix seems to be to send the extra status request after the output report triggering the write. See https://github.com/MichaelZaidman/hid-ft260/pull/7. Cheers, Enrik
