On Wed, Jul 21, 2021 at 11:09 AM Hans Schultz <hans.schultz@xxxxxxxxxxx> wrote: > > On Wed, 2021-07-21 at 10:48 -0700, Dmitry Torokhov wrote: > > Hi Hans, > > > > On Sun, May 30, 2021 at 2:12 AM Hans Schultz < > > hans.schultz@xxxxxxxxxxx> wrote: > > > > > > Hello, > > > I have a problem getting my Elantech touchpad to work with the > > > mainline > > > kernels, and I need some assistance with the code to resolve the > > > problem. > > > The kernels that have tried are 5.9.11 and 5.11.11. > > > > > > With boot parameters i8042.notimeout i8042.nomux, the touchpad is > > > detected but does not work. There is absolutely no response from it > > > with any hid modules loaded. > > > > > > It is reported and seen working on a Lubuntu distro (bionic kernel) > > > when inserting the i2c_hid module. The insertion of the i2c_hid > > > module > > > pulls in the hid_multitouch module when it works, no boot parameters > > > necessary. > > > In the case where it does not work, insering the i2c_hid module does > > > not pull in the hid_multitouch module. > > > > > > I have the bionic kernel code, but I have not as of yet been able to > > > detect what makes it work in contrast to the kernel.org kernels. > > > > > > This I think should lead to a kernel patch. > > > > There is not much to go on with. What is the hardware, your kernel > > .config, dmesg from unsuccessful boot? If you have logs from the > > working kernel that would help too. > > > > Thanks. > > > > The best info I have on the hardware is from Xorg log with the working > Lubuntu kernel: > [ 130.980] (II) Loading /usr/lib/xorg/modules/input/synaptics_drv.so > [ 130.982] (II) Module synaptics: vendor="X.Org Foundation" > [ 130.982] (II) Using input driver 'synaptics' for '0X45 0X4C 0X41 0:00 > 04F3:308C Touchpad' > > I might be able to get the kernel messages when inserting the working > module, but I think it will not tell much more. OK, if you say so. Then the only suggestion I have is to verify that your kernel config enables all necessary options for your hardware. I'd double check if you have Designware I2C controller enabled, ACPI LPSS, etc. > To me it is clearly a code issue as the working kernel pulls in > hid_multitouch when inserting i2c_hid, while the non-working does not. > > All kernels I have tried up to now from kernel.org do not work. The > latest being 5.13.4. Thanks. -- Dmitry
