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

[axp]

Volker Krueger wrote:
> 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
>>
>>
>>
>>   
>>     
Iam working here on my x301, and have a power consumption of an average
of: 8.4Watts

with a usable configuration: wlan on, display brightness high, ondemand
governor  and a lot of applications


so far,
Ferdinand