Hi Patrick, On Sun, Jan 19, 2025 at 05:34:18PM +0100, Patrick Zacharias wrote: > Hello there, > > while using the Formos Infrared Receiver (147a:e016), I've noticed, that > it won't stop blinking and doesn't register any presses. > This issue appears to have been present since 2019, > according to a thread on a German VDR forum. That's interesting, mind sharing a link to the forum discussion please. Also what does the device look like, it would be useful to get it and test it myself if possible. > And appears to be a regression, as according to that thread it used to > work with their software > (yavdr-0.6.2, which appears to based on kernel 3.13.0). A git bisect would be useful. > I've tried this on 5.16-rc2 (mainline on an X86 machine) and with > 6.6.62+rpt-rpi-v8 from the latest Raspberry Pi OS. > > I've analyzed a PCAP dump from a Windows 7 machine to see where the > initialization differs and noticed, > that an undocumented byte 0xF4 is being sent, after DEVICE_RESUME and > G_REVISION (which are both sent in one packet). You mean during device probe? > By unbinding the driver, manually sending 0xF4 to the device and > rebinding the driver, I'm able to workaround this issue. > The blinking is gone and keypresses are now received. (Except for the OK > key). > > No further testing has been done. > > I'm willing to provide PCAP traces, if of interest. Yes please :) Thanks, Sean
