imx-drm: screen flickering

[Christian Gmeiner]

2014-01-28 Christian Gmeiner <christian.gmeiner at gmail.com>:
> 2014-01-28 Christian Gmeiner <christian.gmeiner at gmail.com>:
>> Hi all.
>>
>> From time to time it happens that my LVDS display is flickering (look
>> at scroll bar in the video).
>> https://drive.google.com/file/d/0B_fznDimUHVubWtvVFlMTkdBbUU/edit?usp=sharing
>>
>> I really want to find the root cause of it, but I do not know where to
>> start. I can trigger this
>> sometimes after xscreensever "blanks" the screen and the screensafer
>> gets disabled
>> via user input.
>>
>> Any hints?
>
> I forgot to add some details. I am using a 3.12.4 kernel with some a
> some patches (dts, ..). As root filesystem
> I am using debian 7 and this is how my xorg.conf looks like:
>
> root at OT:/sys/kernel/debug# cat /etc/X11/xorg.conf
> #
> # DO NOT TOUCH - AUTOGENERATED FILE
> #
>
> Section "Device"
>         Identifier      "Card0"
>         Driver          "modesetting"
>
> EndSection
>
> Section "InputClass"
>         Identifier      "keyboard layout"
>         MatchIsKeyboard "on"
>         MatchDevicePath "/dev/input/event*"
>         Driver          "evdev"
>         Option          "XkbLayout" "us"
> EndSection
>
>
> xscreensaver makes use of DPMS. So I think that the the problem could
> be related to DPMS somehow.
>

I can trigger this with:
xset dpms force off; sleep 2; xset dpms force on

I need to execute this command less then 6 times to get the flickering.

greets
--
Christian Gmeiner, MSc