Yearly Archives: 2015

Triple monitor fun

I’ve finished another of my PC plans and upgraded to triple monitors. It was a big change for me – in the first few moments I wasn’t even sure if I’m going to get used to it, but soon I’ve started to love it. Much more (separated – and that’s good!) space for windows/terminals which I use a lot and a fantastic new way of more immersive gaming. It’s also much more appealing in terms of aesthetics. FYI I was using 2 24″ monitors before.

Obviously, my configuration couldn’t be standard, so let’s talk about quirks & tweaks.

I’m using 3 monitors with both Arch Linux host (GeForce 9800 GTX+) and Windows 7 gaming VM (GeForce GTX 960). To achieve comfortable change between those, I use HDMI switches placed under desk. Works great so far.

Monitors are mounted on a triple monitor stand. It was very difficult to find a good one. I was thinking about buying popular Ergotech one, but decided to try and buy less expensive (especially with shipping to Poland) and fairly new one from Duronic. I’m very happy with it in general, but it’s sturdy and hard to line up and level monitors perfectly, yet I’m almost there.

My 9800 GTX+ has only two outputs so to get all 3 screens working I need to use one output built-in onto motherboard GPU. Nvidia does all the rendering, Intel’s output is used only as transport route. I’ve needed to switch to Nouveau as it doesn’t work for me at all on Nvidia binary driver.

Script to turn on 3 monitors:

xrandr --setprovideroutputsource 1 0
xrandr --auto
xrandr --output HDMI3 --right-of DVI-I-1
xrandr --output DVI-I-2 --left-of DVI-I-1

I also utilize 3 monitors on Gaming VM – it’s working very well after enabling Surround in Nvidia GPU options. So far I’ve tested Witcher 3, Fallout New Vegas, Torchlight etc. and it’s marvelous!

There is also one non-trival advantage when using one system for 3-monitor-spanned gaming and another one for 3-monitor-no-spanned working. Switching between Surround/Eyefinity (spanning) would shuffle windows & icons when changed – doesn’t happen here.

Overall, it was new big thing for me and I’m very happy to have it. I’m definitely not crazy about ultra-wide monitors – these are too small for workplace (about size of 2 monitors) and would be very inefficient because of lack of angle if bigger, I hate the idea of curved ones, so there is really nothing better on market for me.

OQVEes5DaN-rMefsqEaIQg98eFXStf4zqTBouIhJArM=w1874-h928-noEdit: I forgot to add info about monitors used. So, there’s one BenQ G2450 in middle and BenQ GL2450 on sides (LED lighting). G2450 wasn’t accessible when I was ordering side monitors, so they have slightly different contrast/color, but are close enought to be good. These are nice for gaming (low/close to none input lag) and are *matte* which is omg-so big deal.

Ignoring hotplug monitor events on Arch Linux

Automatic hotplug event handling can be a problem, eg. when its run for monitors. I use HDMI splitter between my host OS and gaming VM and I didn’t like that my windows were all over the place when I’ve used it.

There are few ways to disable those (but still to be able to run them manually when needed!), but I’ve found only one method is able to run for all GPU drivers.

Most obvious method is xorg setting “UseHotplugEvents”. It’s great, but works only for Nvidia binary driver.

Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "BenQ G2450"
HorizSync 30.0 - 83.0
VertRefresh 50.0 - 76.0
Option "UseHotplugEvents" "False"

There is also similar setting but in this case, for Intel driver only.

Aside of both of that, there may be need to disable automatic xrandr events in your DE.
gsettings set org.cinnamon.settings-daemon.plugins.xrandr active false
gsettings set org.gnome.settings-daemon.plugins.xrandr active false

About this independent one (I use it with Nouveau) – option is to disable udev completely (for a while). That means that it also won’t work for dynamic USB devices, etc. But it’s good enough if you need to disable monitor discovery for a moment and can turn it on later again.

sudo udevadm control --stop

sudo udevadm control --start