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Old 05-23-2018, 01:37 PM   #1
Registered: Jul 2005
Distribution: Slackware
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Question High CPU usage from Xorg

Periodically, htop shows that the command

/usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root:0 -nolisten tcp vt7 -novtswitch
is using about 92% of one virtual core. It does this after starting up, and then it does it periodically while running. Aside from eating up resources, using XCFE shortcut keys is very slow (the command is delayed by minutes).

I'm using Intel's integrated graphics adapter. I noticed that the directory /usr/share/X11/xorg.conf.d/ contains the file 10-amdgpu.conf. Also, running cat /usr/share/X11/xorg.conf.d/10-amdgpu.conf outputs this:

Section "OutputClass"
	Identifier "AMDgpu"
	MatchDriver "amdgpu"
	Driver "amdgpu"
This might well be unrelated, but it looks strange to me as I have no AMD GPU.

Does anyone know how this problem might be resolved?
Old 05-23-2018, 09:08 PM   #2
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Registered: Jan 2006
Location: Virginia, USA
Distribution: Slackware, Debian, Mageia, and whatever VMs I happen to be playing with
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Is there any pattern to what you are doing at the time the CPU usage spikes, such as watching/editing video, etc.?

Regarding the /usr/share/X11/xorg.conf.d/10-amdgpu.conf output, I get the same on this here Zareason machine all-Intel inside machine running Slackware. I suspect the "amd" refers, not to the video card, but to the 64-bit architecture, which is commonly referred to as "amd" in Linux world.
Old 05-29-2018, 12:37 PM   #3
Registered: Jul 2005
Distribution: Slackware
Posts: 207

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It happens after I boot and login. I'm not aware of any other pattern. Searching for "xorg lightdm high cpu usage" returns a lot results, but no promising leads.
Old 10-19-2018, 08:08 AM   #4
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Hey, I actually have exactly the same problem on Debian Stretch stable, after I changed a few things on my system : One core fully used for about 2 minutes on every login (after sleep, hibernate, even login in other tty) by Xorg with this line in htop :

Xorg :0 -seat seat0 -auth /var/run/lightdm/root:0 -nolisten tcp vt7 -novtswitch
And during this time, xfce shortcuts are very slow/not working, but only the keyboard applications shortcuts, not the window manager keyboard shortcuts (which is strange, since they are in the same file if I recall well, but in different menus in the settings).

I started a list of all the stuff I did before it started happening, but I did do a lot of things and am not sure exactly when this started.
If you're interested, we can share and cross check our personnal settings to try and find out where it comes from.

I'll post later on some more info about what I did that could have led to this


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