On 1/20/21 12:32 PM, Patrik Hagara wrote:
>> I'm using the i3 window manager with Qubes in a multi-monitor setup. The
>> laptop monitor is 1920x1080, the external monitor is 2560x1440. To
>> enable the second monitor I do $ xrandr  --output eDP1 --auto --right-of
>> DP1 --output DP1 --auto.
>> The issue I keep running in to is that about half of the time, my mouse
>> will not work on the the external monitor on the rightmost quarter and
>> lowest quarter (approximately). The pointer will move there, but clicks
>> are not registered. It is as if the mousedriver sees the second monitor
>> as 1920x1080 instead of its actual resolution. The status bar is
>> displayed on both monitors.
> Hi,
> This can be fixed by increasing the dom0 Qubes GUI video memory [1].
> [1]
> https://www.qubes-os.org/doc/gui-configuration/#video-ram-adjustment-for-high-resolution-displays
> Cheers,
> Patrik

Thanks for this excellent answer, an immediate fix! Dual monitors now
seem to work flawlessly withouth having to use any fancy xrandr options.

I will at some point propose an update to the qubes-i3 documentation
with this addition among others.

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