Re: help with signal from monitor

[don fisher <hdf3-Wuw85uim5zDR7s880joybQ@public.gmane.org>]

On 01/26/2016 04:31 PM, Ilia Mirkin wrote:
> On Tue, Jan 26, 2016 at 6:24 PM, don fisher <hdf3@comcast.net> wrote:
>> On 01/26/2016 03:58 PM, Ilia Mirkin wrote:
>>>
>>> On Tue, Jan 26, 2016 at 5:54 PM, don fisher <hdf3@comcast.net> wrote:
>>>>
>>>> On 01/26/2016 03:24 PM, Ilia Mirkin wrote:
>>>>>
>>>>>
>>>>> sleep 1 && xset dpms force off
>>>>
>>>>
>>>> Could you confirm exactly how to add the drm.debug=0x1e option. Is it
>>>> another parameter on the kernel command line?
>>>
>>>
>>> Yep
>>>
>>>> Where does the output data go?
>>>
>>>
>>> dmesg
>>>
>>>> Is there a way to get it into a file?
>>>
>>>
>>> dmesg > somefile
>>>
>>> Chances are that your syslog is also set up to read kernel messages
>>> and store them to some log file.
>>>
>>> Cheers,
>>>
>>>     -ilia
>>>
>> Attached is the output from dmesg. I issued the:
>>    sleep 1 && xset dpms force off
>> command, and the the next dmesg dump included lines after 74.948936. I then
>> issued the command again and the dump lines repeated as you can see.
>>
>> Please share you thoughts, and thanks for your help.
>
> You do indeed get some hotplug events. Odd. This is a little out of my league :(
>
> By the way, I notice that your GPU is having trouble bringing up its
> acceleration unit. We added a workaround to reset the GPU harder when
> bringing it up which should hopefully resolve that issue, available in
> kernel 4.4. But I don't think it affects your situation.
>
>    -ilia
>
Is there any way to tell the kernel to write an image, with a grey scale 
vale of 1 perhaps, which might be black but not trigger the monitor to 
assume a hotplug event.

Thanks
don
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