Problem with display driver

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

We have a problem with a display driver that installs completely, functions
correctly, and loads all necessary driver.

BUT, this device then becomes part of the "unknown" device group in device
manager. Looking at the Plug-in-play setting in the registry the "class"
field of "display" is missing.

See HKLM\System\CurrentControlSet\Enum\PCI\ then VEN_xxx
Under this you'll see a device sub-directory yyy, which contains a field
for "Class"
When working the display device for PCI, will hold the value "display".
Ours is left blank.... the "class" REG_SZ value is empty.

Does anyone know how, a device becomes a "class", and what could be wrong if
it is not assigned any "class".

What else could I look at for more information as to why this device works,
but is not assigned a class.
 
Paul,

We may need a bit more information about the driver:
- How does it behave under XP Pro?
- How did you install the driver on your run time (componentized, installed at run time, etc.)?
- Did you include "PnP (User Mode)" component?
- Are all the driver dependencies in your image?
- What \windows\SetupApi.log shows?
- Can you post the driver's INF file so that we could take a look at it?
- Do you have "Class Installer - Display adapters" component in your image?

KM
 
Thanks, so much.

Somehow the component "Class Installer - Display adapters" was removed from
our image.

The problem is fixed.

Later,
Paul.
 
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