Arch Linux

katratxo

Member

From: Spain

Registered: 2012-11-15

Posts: 4

[SOLVED] Input lag on QT based applications

Hi all,

I've been searching for hints on this topic. A couple of QT based applications (e.g. Skype, VirtualBox) have an input lag (keyboard and mouse) of few seconds. This does not happen with the rest of the system.

My environment:

* Hardware: Thinkpad X230 / 16GB RAM / Intel SSD / Intel video card (i915 driver) - (full details attached - lshw.txt)
* Window manager: i3
* Kernel: 4.2.3-1-ARCH #1 SMP PREEMPT Sat Oct 3 18:52:50 CEST 2015 x86_64 GNU/Linux
* Installed packages: (see attached pacman-Qs.txt)

Update: Add links to files

lshw.txt
pacman-Qs.txt

Any hints on how to troubleshoot this issue?

Thanks for your support

Last edited by katratxo (2015-10-16 09:22:59)

katratxo

Member

From: Spain

Registered: 2012-11-15

Posts: 4

Re: [SOLVED] Input lag on QT based applications

A temporary workaround is to add /etc/X11/xorg.conf.d/30-uxa.conf

Section "Device"
	Identifier "intel"
	Driver "intel"
	Option "AccelMethod" "uxa"
EndSection

According to the people in #intel-gfx on irc.freenode.net, this seems a bug in SNA. This is already suggested in:
https://wiki.archlinux.org/index.php/In … SNA_issues

kokoko3k

Member

Registered: 2008-11-14

Posts: 2,481

Re: [SOLVED] Input lag on QT based applications

I notice this when i switch kwin compositor off.

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