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Created attachment 1274754 [details] lsusb -v Description of problem: The touchpad on the Lenovo Yoga 720 appears to not be supported. It's entirely unresponsive, and doesn't show up in xinput list. Upon further investigation, it seems to be due to the driver not binding to it. Since there isn't a lot of information on it, I echoed 06cb 0081 (the only synaptics device in lsusb) into /sys/module/usbhid/driver/usb:usbhid/new_id, but to no avail. Upon seeing a similar bugreport, I attempted with acpi=biosirq which also did not work. Version-Release number of selected component (if applicable): Kernel 4.10.11-200.fc25.x86_64 How reproducible: Always Steps to Reproduce: 1. Install Fedora 25 on Lenovo Yoga 720 Actual results: Touchpad not recognized by any driver, does not show up in xinput list, etc Expected results: Touchpad works Additional info:
Created attachment 1274756 [details] dmesg
Created attachment 1274758 [details] acpidump
Still present as of 4.10.13-200
Hardware IDs reported by Windows: HID\VEN_ELAN&DEV_0651&Col01 HID\ELAN0651&Col01 HID\*ELAN0651&Col01
According to this thread on their forums https://forums.lenovo.com/t5/Linux-Discussion/Install-linux-in-Lenovo-Yoga-720/m-p/3665441/highlight/true#M9357 it may be 06CB:7F8F connected over I2C instead of USB. I ended up returning the device, but it looks like user mealejan was able to get it working. If I still had it to play with, I'd compare the i2c_hid versions between his version (4.10.13-1-ARCH) and the latest Fedora and see if I could find a specific patch that introduced support Good luck to anyone who takes up the torch on that endeavor
Upon double checking on that thread, there seems to be a difference between the 13 inch model and the 15 inch model. The 13 inch model appears to work out of the box with most Linux, but the 15 inch is the one that appears to have the major issues
I am also affected by this bug. In that thread there was a suggestion to try to apply the following patch to the kernel: ``` diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c index d5ab9dd..6a8b40f 100644 --- a/drivers/input/mouse/elan_i2c_core.c +++ b/drivers/input/mouse/elan_i2c_core.c @@ -1224,6 +1224,7 @@ static const struct acpi_device_id elan_acpi_id[] = { { "ELAN0100", 0 }, { "ELAN0600", 0 }, { "ELAN0605", 0 }, + { "ELAN0651", 0 }, { "ELAN1000", 0 }, { } }; ``` I'm new to compiling the linux kernel and didn't manage to get a bootable initrd.
If you install the source package for the kernel, you can rebuild the kernel with your changes, a good base instruction set for fedora would be https://fedoraproject.org/wiki/Building_a_custom_kernel/Source_RPM
Please also check this bug report: https://bugs.launchpad.net/bugs/1700657 Kernel 4.13 with this patch is still not working.
I was able to make the touchpad work with that patch https://patchwork.kernel.org/patch/10021495/ on Kernel 4.13.0 (ubuntu 17-10 version). I had to recompile the elan_i2c driver with the patch to match my kernel.
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Fedora 25 changed to end-of-life (EOL) status on 2017-12-12. Fedora 25 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.