Member Avatar for Watson306

Hi Guys,
I hope I am posting this in the correct place?
I have a Acer 8935g with Windows 7 installed on it, and for the last month and a half the touchpad driver keeps disapearing - I reinstall it, and it works until I put the machine into hybernate and then its gone again and the touchpad obviously doesnt work again.

Any Ideas???

Thanks in advance.

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As describes, the touchpad vanishes from Device Manager after hibernate/power events and only returns after uninstalling/reinstalling the Synaptics software; showing hidden devices reveals a yellow triangle and Code 24. Code 24 means Windows believes the device is “not present” (driver/installation or hardware/ACPI issue) and the usual first step is to remove the device entry and let Windows re-detect it. (support.microsoft.com)

Practical steps (try in this order):

  1. Show and remove ghost/non‑present entries
  • Open an elevated command prompt and run:
set DEVMGR_SHOW_NONPRESENT_DEVICES=1
start devmgmt.msc
  • In Device Manager choose View → Show hidden devices, expand “Mice and other pointing devices” and “Human Interface Devices”, uninstall any greyed/old Synaptics / PS/2 entries (check “Delete the driver software” if offered), then Action → Scan for hardware changes or reboot. (learn.microsoft.com)
  1. Identify the exact hardware/driver before reinstalling
  • In Device Manager → Properties → Details → Hardware Ids to get VEN/DEV strings; use those to fetch the correct Synaptics/ALPS/Elan driver from vendor sites (don’t rely solely on generic Windows drivers). DevCon/PnP tools show how to read IDs. (learn.microsoft.com)
  1. Clean driver packages if a bad package persists
  • List driver packages and remove offending OEM INF from the driver store:
pnputil /enum-drivers
pnputil /delete-driver oemXX.inf /uninstall [/force]

Backup or create a System Restore point first; pnputil is the supported way to remove stale/corrupt driver packages. (learn.microsoft.com)

Other useful checks: uncheck “Allow the computer to turn off this device to save power” for relevant HID/USB entries (power management can stop devices resuming), update chipset and ACPI drivers and BIOS from Acer, and confirm Launch Manager / FN toggles or the Synaptics setting that disables the touchpad when an external mouse is attached aren’t flipping it off. If the device still reappears as Code 24 after these steps the failure may be at the ACPI/firmware level or a hardware I/O fault and will need vendor BIOS/firmware or service attention. (support.microsoft.com)

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Member Avatar for caperjack

hi, so even after a reboot of the computer it still doesnt work

Member Avatar for caperjack

also did it come with win7 or Vista ,and are you installin correct drivers for win7

Member Avatar for caperjack

actually this use to happen on my laptop win7 , iremember going into device manager and getting it to chen the internet for drivers and it found and updated the driver and it keept working after that ,wish laptop did but it died later on

Edited by caperjack because: fix word
Member Avatar for Watson306

Yes, even after a reboot it doesnt come back. I have to uninstall the driver, plus the synaptics software, and then it works again until it goes into hybernate or is power cycled.

Whilst its not working if I go into device manager and click on 'mice and pointing devices' the driver is not there. If I click on view and then click on show hidden devices it comes up with a yellow warning next to it - which if I look into it says "This device is not present, is not working properly, or does not have all its drivers installed. (Code 24)".

The laptop came with vista, but with a Windows 7 update disk. I have installed all the drivers from the Acer support site (I know these are not always the latest drivers) But I just dont know where to start again from as I have pretty much updated every driver on the machine ince chipset Bios, and Acer software.

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