Dmitry Torokhov schrieb: > On 3/28/07, Jiri Kosina <[EMAIL PROTECTED]> wrote: >> On Tue, 27 Mar 2007, Thomas Meyer wrote: >> >> > It seems, that after the resume all usb devices gets removed and >> plug in >> > again (virtually!). This results in a new input device name: >> >> Yes, this is what actually happens. JFYI see current thread on lkml >> which >> is a bit realted - http://lkml.org/lkml/2007/3/27/149 if interested. >> >> > This change confuses the X synaptics driver: >> > Touchpad no synaptics event device found (checked 11 nodes) >> > Touchpad The /dev/input/event* device nodes seem to be missing >> > (EE) xf86OpenSerial: Cannot open device /dev/input/event2 >> > No such file or directory. >> > (WW) Touchpad: cannot open input device >> > One could say that the synaptics driver rightly complains about the >> > missing event2 device! So is this a bug in the X synaptics driver? >> >> You can of course work this around by adding an udev rule such as >> >> SUBSYSTEM=="input",KERNEL=="event*",SYSFS{name}=="appletouch",SYMLINK+="input/appletouchpad" >> >> >> and the let Xorg use /dev/input/appletouchpad, which will always be a >> symlink to the correct device. >> This was my first idea, too. But then i found this entry in the Changelog of the synaptics driver:
- In the DeviceOn() function, if opening the device node fails, try to auto-detect the correct event device again. This fixes some problems which occur after a suspend/resume cycle or after rmmod/insmod-ing the psmouse kernel driver. > > I am not sure if this would help... According to the excerpt from X > log synaptics driver attempted to scan evdev devices and locate the > touchpad. However if this scan happen before udev had a chance to > process the event and create new /dev/input/eventX device node it will > fail. Okay. This strengthens above statement. And udev is too slow to create the devices, while the driver already scanned the directory. > > I wonder if we should adjust the X driver to spin for a couple of > seconds in EventAutoDevProbe if the touchpad was already seen once... > Peter? >
