• Flickering or dithering

    hello, I’m using gnome antergos and i’m getting strange flickering in areas of certain shades. In the browser or context menus or anywhere else.
    I can easily produce the issue in gimp by using the brightness slider on a solid colour rectangle. As i move the slider down, it flickers, is still, flickers, etc.

    I think the phenomenon is dithering but it shouldn’t be happening with my monitor. I’ve been using ubuntu for years without this issue.

    Any suggestions? many thanks

  • Give us the output of this two commands:

    sudo lspci
  • Here’s the graphics stuff:

    00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
    00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)

    and the session type is x11.

    I’m using intel hd3000 and my optimus card is disabled as bios, thanks

  • https://wiki.archlinux.org/index.php/Intel_graphics#Screen_flickering

    as wiki say adding i915.enable_psr=0 and/or i915.enable_rc6=0 to kernel parameters inside grub may help:
    edit /etc/default/grub

    $ sudo nano /etc/default/grub

    change the line:



    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_rc6=0"

    save with [Ctlg+X]
    and rewrite grub config:

    $ sudo grub-mkconfig -o /boot/grub/grub.cfg

    First ind see if it get better after reboot…

  • It suddenly got a whole lot worse today. Turns out it was the start of my monitor breaking down. Happens with other computers on this monitor now too. thanks anyway!

  • sadly hardware is doing this sometimes 🛍

  • …and now it’s inexplicably fine again. This is bizzare. I had flickering in linux and windows and with another laptop. I tried another cable. I tried my computer on another screen and it was fine. The problem was definitely my monitor but today the problem has disappeared.

    What’s more (to rant) I spent an hour yesterday listening to ‘your call is very important to us but our operators are busy at the moment, you are in the queue’ until someone reminded me it was a bank holiday. That’s viewsonic service, for anyone interested. In their defence they answered my email this morning and apologised.

  • I know what you mean😄

    Once you hear the “your call is important to us” message, you know you’re doomed!

  • At least your monitor seems to be working fine…

  • well it’s happening again. I’ve now tested my computer with 5 different monitors.
    Screen is fine with the built in 6-bit or external 8-bit monitor (no dithering) but anything else gives terrible flickering bands.

    For example, if I have a grey square in gimp and change the brightness it flickers, is still, flickers etc. The same happens on an external monitor if I use that monitor’s controls to change brightness/contrast. If i turn the monitor to 6 bit mode, the bands get bigger.

    I’m now sure the issue is with my laptop rather than the monitors and it’s a problem with dithering. I tried @joekamprad 's solution but it didn’t work. Other users have reported this issue going with an earlier kernel but I get the same problem in windows…

    Any ideas? thanks

  • Can anybody tell me how to force 18-bit output?

flickering7 dithering1 Posts 11Views 1776
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