Re: LCD does not wake up

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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