Re: Broken Dell BIOSes (was: Re: ACPI question)

[Erik Slagter <erik-KW7PGP3XNp7a5EbDDlwbIw@public.gmane.org>]

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On Fri, 2005-11-18 at 16:27 +0000, Matthew Garrett wrote:
> > I have a DELL inspiron 510m running Fedora core 3 (2.6.9).
> > I have trouble with my ACPI. When ever I close the lid, the screen goes off (I
> > do not know whether it suspen to RAM or not).
> > But when I open the lid, it does not wake up and the screen still is off. I
> > must press the power button. therefore system shuts down
> > and I must restart it again.
> 
> There's a bug in Dell's current laptop BIOSes. If you shut the lid and 
> open them again, they won't switch the screen back on. I've been 
> spending the past month fighting with Dell technical support over this, 
> so if anyone has any contacts inside Dell, that would be great. The same 
> thing happens if you boot Windows in safe mode, so it's certainly not a 
> Linux bug.

AFAIK many laptops (not only Dell) show this behaviour, at least while
actually suspending, they either do not turn off the backlight, or do
not turn them back on after resume. I guess "windows drivers" all fix
this. Or maybe lack of linux acpi support? Anyway if you have a
"suspend" supported video card with X driver, it will work nonetheless
(like ati) because the driver will do the right thing or otherwise there
are some tools around to explicitly turn on/off the backlight.

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