[arch-general] gnome-shell - massive cpu usage in dual screen mode

[Jan Steffens]

On Fri, Apr 15, 2011 at 11:32 PM, Christoph Glaubitz
<chris+arch at chrigl.de> wrote:
> Hi,
>
> I installed gnome3 from testing today, and it works fine so far.
> But in dual screen mode, the gnome-shell uses between 50 and 100% cpu
> continuous. Just after login, without any other programs running.
>
> If I switch off one of my displays - it does not matter which one, the
> laptop display or the vga plugged - gnome-shell runs on 1% cpu usage
> again. It is also possible to switch between the displays without
> problems, as long as one of them is switched off.
>
> Since this is a 6(?) year old Intel 915GM chipset, it's maybe just
> related to too little grafical power.
>
> Is anyone able to confirm this on a more powerful machine?
>
> --
> chris
>

The issue is probably that the dual screen desktop size exceeds your
card's maximum texture size, triggering software rendering fallbacks
in OpenGL all over the place.