On Sun, 4 Apr 2021, Hans de Goede wrote: > Just like the K12A the Dell K15A keyboard-dock has problems with > get_feature requests. This sometimes leads to several > "failed to fetch feature 8" messages getting logged, after which the > touchpad may or may not work. > > Just like the K15A these errors are triggered by undocking and docking > the tablet. > > There also seem to be other problems when undocking and then docking again > in quick succession. It seems that in this case the keyboard-controller > still retains some power from capacitors and does not go through a > power-on-reset leaving it in a confuses state, symptoms of this are: > > 1. The USB-ids changing to 048d:8910 > 2. Failure to read the HID descriptors on the second (mouse) USB intf. > 3. The touchpad freezing after a while > > These problems can all be cleared by undocking the keyboard and waiting > a full minute before redocking it. Unfortunately there is nothing we can > do about this in the kernel. > > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Applied, thanks Hans. -- Jiri Kosina SUSE Labs
