Path: news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: druck <news@druck.org.uk>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Dual monitors on Pi5
Date: Tue, 24 Jun 2025 21:18:13 +0100
Organization: A noiseless patient Spider
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On 24/06/2025 05:28, bp@www.zefox.net wrote:
> bp@www.zefox.net wrote:
>> Having some strange trouble getting dual monitors working with my
>> 8GB Pi5. It only wants to use one of them.
> 
> After much fumbling about, both monitors are recognized and
> working as desired. HDMI0 is the monitor providing audio output,
> HDMI1 is a DVI monitor providing extra screen space. So far, so good.
> 
> Most of the time, HDMI1 isn't needed. However, if I power it off,
> the mouse freezes, even if the cursor is visible on HDMI0. Worse
> things could happen, but I'd rather not leave it powered on without
> need. HDMI1 uses around 60 watts, more than the rest of my hardware
> combined. I never tested this with the earlier dual-monitor setup,
> a small 1600x900 DVI, so am not certain if the behavior is new or old.
> 
> Anybody know of a workaround?

Are you running the standard Pixel desktop which by default will now use 
the Wayland windowing system instead of X11? If so try switching to X11 
using raspi-config and see if that stops the problem.

I'm running the Mate desktop on X11 and don't have any problems with one 
or other or both of the monitors disappearing, as they are on HDMI 
switches allowing me to mix and match monitors with other systems as 
desired.

---druck