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

[axp]

Volker Krueger wrote:
> cool!! :-))
> Thanks for the info!
>
> Some I had done myself, but some I will try, too!
>
>
>
> axp wrote:
>   
>> Volker Krueger wrote:
>>   
>>     
>>> Hi Ferdinand,
>>>
>>> that sounds actually like you have found a good setting.
>>>
>>> I just tried the same (normal wiring on battery with thunderbird and
>>> firefox) and I have a long-term consumption (according to poiwertop) of
>>> 9.8W, the short term is presently at around 8.9 W.
>>>
>>> Did you do anything special to get the consumption down or was it like
>>> that out of the box?
>>>
>>> best,
>>> Volker
>>>
>>>
>>> axp wrote:
>>>   
>>>     
>>>       
>>>> 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
>>>>   
>>>>     
>>>>       
>>>>         
>> I did some twaeks,
>>
>> iwconfig wlan0 power on
>> echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
>> echo min_power > /syhttp://www.thinkwiki.org/wiki/How_to_reduce_power_consumptions/class/scsi_host/host0/link_power_management_policy
>>
>>
>> laptop_mode
>>
>> and snd_hda_intel powersave, and options usbcore autosuspend=5
>>
>>
>> BTW: I had also a high interrupt frequency with the older kernel, but
>> since the update from intrepid-proposed the interrupts are gone
>>
>>
>> HTH,
>> Ferdinand
>>   
>>     
A good ressource is,
http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption

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