http://bugzilla.kernel.org/show_bug.cgi?id=5155





------- Comment #24 from [EMAIL PROTECTED]  2007-09-29 05:44 -------
(In reply to comment #22)
> Hi, Daniel,
> 
> For the blank screen issue, is this a usual case in all Dell laptops?

Yes, most modern dell laptops have this issue. 

> Is there any difference if you kill acpid before closing and opening the lid?

No. As detailed in some links above, the DSDT blanks the screen when the lid is
closed (and also blanks it again when it is opened!)

> I can't reproduce this problem on other laptops like thinkpad and hp.
> If this only happens on your laptop, do we have to fix it in the kernel?

It would be nice. Len Brown suggested this approach in comment #15 and
http://marc.info/?l=linux-acpi&m=117872589707718&w=2

> A script to poke /proc/acpi/video/LCD/state in user space can fix the problem.
> Thus I'm afraid that the second patch is too complex to be accepted in the
> mainline kernel. what's your opinion?

I don't feel it is too complex (but would happily take feedback on it). Also I
feel it is realistic and best to fix it in the kernel. Consider minimal install
media, which is very unlikely to ship acpid. If the user shuts the lid during
installation, they are in trouble...

> I'm more curious about what _DSS can do for the S3 video issue.
> When resume from a S3 sleep, does the screen come back?
> If not, can "echo 0x80000001 > /proc/acpi/video/LCD/state" poll the screen 
> back
> for you?

I will look into this in the week.


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