[ACPI-sppt] Re: backlight and other problems on dell inspiron 8200 w/ 2.5.69

I am also having problems with ACPI support on a Dell Laptop. 
I have a Latitude C840, which I think is effectivly identical to the
inspiron 8200 that Jonathan Steinert posted about having problems with.

I'm currently running 2.5.70 mostly stock RedHat 9 system. I'm using the
XFree86 Nvidia driver (not NVIDIA's crappy propritary driver)

While ACPI is enabled (problem doesn't exist with APM)
1. Screen doesn't come back on after closing the lid. It stays totally black
with no faint desktop, but then again I've seen these laptops with a dead
backlight and couldn't make out any picture on them either.  This works fine
with ACPI disabled and APM enabled.

2. Suspend to ram (echoing 1> /proc/acpi/sleep) just locks the system.
Although suspend to ram works with APM rather than ACPI.

3. Software-Suspend-to-disk (echoing 4> /proc/acpi/sleep) acts like it's going
to work, throws all kinds of fun stuff on the screen and then wakes back up
right away, messing up my network interfaces in the process.

I can't test swsusp under APM because the seperate proc interface for it has
been removed (!!) and the only way to enable hybernate is via the ACPI
interface.

4. ACPI fails to read the battery state.. With APM I can get my battery
status, but with ACPI enabled the battery files in the ACPI proc interface
just say unknown.  Back in 2.5.69 I hacked my APM to still provide this info
while using ACPI :) which got me what I needed..

I'm willing to run any test code/patches...
Any suggestions?  
Thanks


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