Screen Flickering with Intel HD 4000 / Stretch/DevuanAscii

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Screen Flickering with Intel HD 4000 / Stretch/DevuanAscii

Postby mrkapqa » 2018-12-09 20:12

Hello ,

i have noticed my Devuan (Ascii, based on Debian Stretch) to latest Stable, and found that the screen is flickering quite some times, when moving through windows . I happens only an instance of a second, but it is noticeable.


Is this common? I have a T430 with integrated only, Intel HD 4000.
The Desktop is XFCE.

I tried to upgrade the Intel HD 4000 (from backports), but did not find anything.
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby llivv » 2018-12-09 20:51

be very careful using debian packages from jessie and stretch with Devuan, especially xserver.
(due to systemd deps) don't ask me how I know/forgot :?
buster currently is better but one should still know what one is doing mixing devuan and debian before diving in.
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby mrkapqa » 2018-12-09 20:56

Hello , thanks for your answer!

Acutally, i had installed a "pure" Devuan Jessie, and then upgraded to Ascii; it is my understanding that the packages are the same as Debian; only "addendum" i made is that i use Deb Multimedia, but that should not affect.

The artifacts appear quite regularly, eg. when i close windows or scroll through windows.


I had installed Debian Wheezy before, and also Kubuntu i think, so i can sort out a Hardware failure with the internal Graphics.
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby llivv » 2018-12-09 21:05

unless devuan is now systemd compatible I STRONGLY recommend not using Debian jessie and stretch packages with it.
Of course if you know what you are doing - that is a whole other story,
One we are reading now.....
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby stevepusser » 2018-12-10 20:00

Are you using any kind of compositer? XFCE's has a setting to sync the vblank to reduce tearing, but sometimes that doesn't work. I'm using Compton myself with the glx backend, but then we get into a whole whirlpool of config options.

Install inxi if you need to and confirm you're defaulting to the kernel's modesetting driver with

Code: Select all
inxi -G


So you can try a newer kernel to see if that fixes it (will not, in my experience, YMMV) or make sure xserver-xorg-video-intel is installed, create a text file called 20-intel.conf with the contents

Code: Select all
Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "TearFree"     "true"
EndSection



copy it to /etc/X11/xorg.conf.d, and reboot. See if that fixes it, and that "inxi -G" shows the intel driver in use.
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby mrkapqa » 2018-12-12 11:57

Hello , thank you for your answer.


I do not know which backend is installed with XFCE,
but installed inxi as you proposed.


rich@devuan:~/Downloads$ inxi -G
Graphics: Card: Intel 3rd Gen Core processor Graphics Controller
Display Server: X.Org 1.19.2 drivers: modesetting (unloaded: fbdev,vesa)
Resolution: 1366x768@60.10hz
GLX Renderer: Mesa DRI Intel Ivybridge Mobile
GLX Version: 3.0 Mesa 13.0.6


when i however try to copy your proposed change (20-intel.conf) to /etc/X11/xorg.conf.d it says that it is not there
(i do have xserver-xorg-video-intel installed).
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby Head_on_a_Stick » 2018-12-12 14:53

mrkapqa wrote:when i however try to copy your proposed change (20-intel.conf) to /etc/X11/xorg.conf.d it says that it is not there

Code: Select all
# mkdir -p /etc/X11/xorg.conf.d
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby mrkapqa » 2018-12-12 16:08

Thank you , that was quite helpful;

it seems the tearing is now conisderably reduced, but so is also performance (graphical performance).
it is like xfce with a "brake" ... will keep on testing.


rich@devuan:~$ inxi -G
Graphics: Card: Intel 3rd Gen Core processor Graphics Controller
Display Server: X.Org 1.19.2 driver: intel
Resolution: 1366x768@60.10hz
GLX Renderer: Mesa DRI Intel Ivybridge Mobile
GLX Version: 3.0 Mesa 13.0.6
h
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby stevepusser » 2018-12-12 21:55

Have you played around with the XFCE compositor or Compton yet?
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby mrkapqa » 2018-12-13 04:35

hello ,

yes, i think i had this compton installed in the past, for getting docky to become transparent or something similar. compiz on lxde, gnome2, i remember; that was very nice program.
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby stevepusser » 2018-12-13 21:56

I don't know if you're confusing Compton with Compiz, but they are different.

If you fondly remember the older Compiz with all the amazing effects, there is a forked and updated version of that called "compiz-reloaded". http://compiz-debian.tuxfamily.org/

The "better" (not) Compiz 0.9.xx in the Debian repos is only a pale reflection of its former glory.
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Re: Screen Flickering with Intel HD 4000 / Stretch/DevuanAsc

Postby mrkapqa » 2018-12-14 19:11

Thank you ,

that was very welcome; it plays beautifully with xfce!

don't know if i had compton to install for transparency, i guess so; but somehow , i could not get it to work , most probably, otherwise i would have remembered it more clearly.
(task was probably to get docky or cairo with more options , transparency, etc).
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