[ltp] suspend works with i915 module, but without, it fails!

[Volker Krueger]

Hi,

when I use powertop, I can see that i915 generates a lot of interrupts.
Apparently, this is a bug that is corrected in 2.6.28. Perhaps in your
ubuntu kernel this is already fixed.

I am using opensuse and here, the bug with the i915 sending a lot of
interrupts is not yet fixed.

If you say that there is no difference in power consumtion for you when
working with or without the i915/dri, then I suppose it is sufficient to
simply wait for the corrected kernel.

Presently, at least, it still is a difference of about 1-1.5 W.

best,
Volker



axp wrote:
> Volker Krueger wrote:
>   
>> dear all,
>>
>> two small corrections: of course it is kernel 2.6(!).27.7
>>
>> and in case of the wakeup after the standby: the screen does not stay
>> blank as described below. My memory was wrong: the wakeup end where the
>> screen is black with the mouse pointer visible, i.e., the x-server
>> starts but then something freezes. I have not tried a remote login. In
>> case a remote login would work: which log file would be the one to look at?
>>
>> does anyone have an idea how to debug that in general?
>>
>> best,
>> Volker
>>
>>
>> Volker Krueger wrote:
>>   
>>     
>>> Hi,
>>>
>>> has someone observed this, too?
>>>
>>> my laptop happily suspends when the i915/dri  modules are loaded.
>>> However, it fails when I start the x-server without the i915/dri !!
>>>
>>> To be precise: I use suse11.1, with the std-kernel (kernel 2.7.27.7).
>>> The laptop: X200s
>>> Graphicscard:Intel Graphics Media Accelerator 4500MHD
>>>
>>> I compare the two x-server  settings, where one has the additional line 
>>>
>>> 'Option       "NoDRI"'
>>>
>>> in the Device-section.
>>>
>>> Without the NoDRI option, the suspend works perfecty. With this option,
>>> however, the laptop shuts down, but hangs somewhere after the wake-up,
>>> while the screen is still dark.
>>>
>>> The whole point for using NoDRI is that the X200s saves about 20%(!!)
>>> energy when on battery.
>>>
>>> any ideas?
>>>
>>> best,
>>> Volker
>>>
>>>   
>>>     
>>>       
> Hi,
>
> i can confirm this bug, although having a x301, but we have the same GPU.
>
> what i cant confirm is that you can save 20%(!!) of power drain with
> setting the NoDRI option.
>
> mine is using 8.7W while writing this email and have a lot of
> applications open which are known to wake the system a lot:
>
> pidgin
> opera (20+ tabs open, currently doing some research)
> thunderbird
> and some terminals
> 2.6.27-11-generic  x86_64
>
> using ubuntu 8.10
> with some additional sources:
> deb http://ppa.launchpad.net/intel-gfx-testing/ubuntu intrepid main
> deb http://ppa.launchpad.net/surban/ubuntu intrepid main
>
> and intrepid-proposed
>
>
>
> i would recommend using the intel-gfx-testing maybe it helps
>
>
>
> HTH,
> Ferdinand
>
>
>
>