LCD does not wake up

LCD does not wake up

[Hadmut Danisch]

Hi,

is there any FAQ about ACPI problems?

I have an MSI S260 (Intel chipset) with
kernel 2.6.11.7. 

An  echo mem > /sys/power/state  works well, 
the machine goes into suspend state and wakes up 
properly except for one thing: The LCD remains black,
backlight is not turned on.

How can I turn the display on?

regards
Hadmut


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Re: LCD does not wake up

[Tomasz Kojm]

On Sat, 9 Apr 2005 23:31:10 +0200
Hadmut Danisch <hadmut-kdZ+H/N/Ve2ELgA04lAiVw@public.gmane.org> wrote:

> I have an MSI S260 (Intel chipset) with
> kernel 2.6.11.7. 
> 
> An  echo mem > /sys/power/state  works well, 
> the machine goes into suspend state and wakes up 
> properly

Oh, lucky you! Mine is a sleepyhead and doesn't want to wake up at all
:-(

> except for one thing: The LCD remains black, backlight is not turned
> on.
> 
> How can I turn the display on?

Try `dpms on`. You can find the tool here:
http://www.srcf.ucam.org/~mjg59/laptops/

-- 
   oo    .....         Tomasz Kojm <tkojm-Vl9ZkupcxcOsTnJN9+BGXg@public.gmane.org>
  (\/)\.........         http://www.ClamAV.net/gpg/tkojm.gpg
     \..........._         0DCA5A08407D5288279DB43454822DC8985A444B
       //\   /\              Sat Apr  9 23:37:08 CEST 2005



-- 
   oo    .....         Tomasz Kojm <tkojm-Vl9ZkupcxcOsTnJN9+BGXg@public.gmane.org>
  (\/)\.........         http://www.ClamAV.net/gpg/tkojm.gpg
     \..........._         0DCA5A08407D5288279DB43454822DC8985A444B
       //\   /\              Sat Apr  9 23:42:00 CEST 2005


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Re: LCD does not wake up

[Hadmut Danisch]

Tomasz Kojm <tk@lo...> wrote:

> Try `dpms on`. 


Good hint, thanks. But doesn't work. :-(

Any other idea how to wakup the LCD?

regards
Hadmut


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Re: Re: LCD does not wake up (problem found)

[Hadmut Danisch]

Ok, 

I found the problem and the solution. The problem is mentioned
on http://www.thinkwiki.org/How_to_make_ACPI_work, it's a kernel 
bug. 

It takes the boot parameter 

  acpi_sleep=s3_bios


The web pages says this problem had been fixed in 2.6.11-rc1, but
obviously it still exists.


regards
Hadmut




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Re: Re: LCD does not wake up (problem found)

[Carl-Daniel Hailfinger]

Hadmut Danisch schrieb:
> Ok, 
> 
> I found the problem and the solution. The problem is mentioned
> on http://www.thinkwiki.org/How_to_make_ACPI_work, it's a 
> kernel bug. 

The webpage only applies to thinkpads. For information about other
manufacturers and models, please refer to
Documentation/power/video.txt in your Linux source. However, I
can't see where on the page that problem is described as a
kernel bug.


> It takes the boot parameter 
> 
>   acpi_sleep=s3_bios
> 
> 
> The web pages says this problem had been fixed in 2.6.11-rc1, but
> obviously it still exists.

Yes, that is a machine specific parameter. Some time in the future,
distributions will probably set it automatically, but there is no
generic way to find out which resume parameters a machine needs,
we can only build a database and use that.


Regards,
Carl-Daniel
-- 
http://www.hailfinger.org/


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Re: Re: LCD does not wake up (problem found)

[Matthew Garrett]

On Sun, 2005-04-10 at 10:43 +0200, Hadmut Danisch wrote:
> Ok, 
> 
> I found the problem and the solution. The problem is mentioned
> on http://www.thinkwiki.org/How_to_make_ACPI_work, it's a kernel 
> bug. 

It's not a kernel bug. Most hardware needs the video to be
reinitialised. s3_bios is one way of attempting to do that, and it works
on some hardware. On other hardware, it crashes the machine.

-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org



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Re: LCD does not wake up

[Pavel Machek]

On So 09-04-05 23:31:10, Hadmut Danisch wrote:
> Hi,
> 
> is there any FAQ about ACPI problems?

Doc*/power/video.txt
						Pavel
-- 
Boycott Kodak -- for their patent abuse against Java.


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