xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)

Question

I get this error in Xorg.0.log

xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)

Googling quickly reveals that this error is caused by starting Xorg as non root user. Problem is that I'm running this as root. Next possible cause SELinux, that is diabled too.

Any other possible causes of this error?

My graphicscard is

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7500M/7600M Series] (prog-if 00 [VGA controller])

But I have severe problems with the drivers, so I'm trying to run as Vesa, using this xorg.conf

Section "Device" Identifier "Videocard0" Driver "vesa" EndSection

Actually you shouldn't log in as root this way, at all. The simplest way should be to use a display manager. — James Youngman, Feb 06 '16 at 22:57
What distro are you using? The default setup could have something to do with it. — IW16, Aug 17 '16 at 23:11

Pedro Lobito · Answer 1 · 2017-05-22T01:29:06.387

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sudo chmod u+s /usr/bin/xinit

Fixed my problem on Linux Mint

edited May 22 '17 at 01:29

answered May 21 '17 at 23:48

Pedro Lobito

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I'm curious about the reasoning for this. – Nathan Lutterman Nov 18 '20 at 21:27

score 0 · Answer 2 · edited Feb 22 '23 at 08:36

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xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)

Xorg is trying IO as non-root or even root on Ubuntu 22.04.

Try this as root:

sudo setcap CAP_SYS_RAWIO+eip /usr/lib/xorg/Xorg

then restart Xorg

edited Feb 22 '23 at 08:36

AdminBee

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answered Feb 22 '23 at 04:29

Luiz Carlos

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xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)

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