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Tags: wireless   graphics   intel-graphics   xps  
Link: 🔍 See Original Answer on Ask Ubuntu 🔗

URL: https://askubuntu.com/q/1064747
Title: Serious screen flickering when WiFi is on (Dell XPS 15)
ID: /2018/08/12/Serious-screen-flickering-when-WiFi-is-on-_Dell-XPS-15_
Created: August 12, 2018    Edited:  August 14, 2018
Upload: November 24, 2022    Layout:  post
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Solution is i915.edp_vswing=2 kernel parameter

Although OP has solved the problem thanks to Arch Linux link in next section questions still remain about what it means.

From announcement: Display Port Presentation December 2010:

As many people here already know, i915 is Intel’s display driver for Linux that has been around for decades.

The vswing component I cannot fathom but, you can find the C code that controls it here: https://patchwork.kernel.org/patch/6349211/

The parameter settings (after = sign) can be:

I will set my kernel parameter to 1 and reboot after posting this answer.

This is a temporary setting for older kernels according to what I read tonight. So you should occasionally remove the setting after new kernels are installed to see if it’s still necessary.

Finally there is an interesting tidbit here: https://patchwork.kernel.org/patch/9303023/

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Original post that helped OP stumble on solution

Here is a great link for you: Arch Linux Dell XPS 13 (9350):

Content adaptive brightness control

In the XPS 13 the display panels (both FHD and QHD+) come with
adaptive brightness embedded in the panel firmware, this “content
adaptive brightness control” (usually referred to as CABC or DBC) will
adjust the screen brightness depending on the content displayed on the
screen and will generally be found undesirable, especially for Linux
users who are likely to be switching between dark and light screen
content. Dell has issued a fix for this however it is only available
to run in Windows and for the QHD+ model of the laptop so this
precaution should be taken before installing Linux, the FHD model of
the XPS 13 (9350) cannot be fixed. This is not a problem with the
panel but rather a problem with the way the panels are configured for
the XPS 13, as the same panel exists in the Dell’s Latitude 13 7000
series (e7370) FHD model but with CABC disabled. The fix is available
directly from Dell.

Additionally check these posts from other Dell users:

⇧ Use sleep with minutes and seconds How to install 2 Graphics drivers, and have Ubuntu detect and load which one (without conflict)  ⇩