On Fri, 4 Dec 2020, Hui Wang wrote: > On the latest Thinkpad Yoga laptop, the touchscreen module is wacom > I2C WACF2200 (056a:5276), we found the touchscreen could not work > after rebooting, needs to poweroff the machine then poweron the > machine to let it work. > > It is highly possible that this is a BIOS issue, but the windows > doesn't have this problem with the same BIOS. > > If keeping the power on when calling shutdown, the touchscreen could > work after rebooting. Let us add a quirk for it and apply the quirk > to this machine only. I wonder what do Windows do differently here. Perhaps they never put the i2c device to sleep while in shutdown anyway? Is there any downside to (not) doing the same? Thanks, -- Jiri Kosina SUSE Labs
