Gnome-Shell

[Andy Campbell]

Regarding Alans comment about gnome-shell falling back on > 2048 pixel
wide displays, I had the same thing with gnome-shell on an nvidia card
using the nouveau drivers.  So, I guess this might not be specific to
i9xx displays.  In my case, one symptom was that these errors appeared
in Xorg.0.log
---
(II) AIGLX: Screen 0 is not DRI2 capable
(II) AIGLX: Screen 0 is not DRI capable
---
even though the card is DRI capable.

I believe this blog entry has the reason:
https://jeremy.visser.name/2009/10/no-dri-on-x-org-with-a-radeon-check-your-virtual-size/
Quoting from that page: "Because of various technical reasons, when
the Virtual size is too big (which, evidently, 2048×2048 is), DRI gets
disabled"

I started seeing this error after I upgraded to a new nvidia card with
more memory.  After the upgrade my default Virtual size went to about
8000x8000 and gnome-shell would only run in fallback mode.  Strangely,
the problem went away when I switched to the closed source nvidia
drivers, and gnome-shell works great.

Andy

On Thu, Dec 15, 2011 at 10:43 AM, Alan Cox <alan at lxorguk.ukuu.org.uk> wrote:
>> gnome-shell itself doesn't care, it just uses x.org. If x.org runs, and
>> gives 3D capability, that's all that gnome-shell cares about.
>
> Actually it does seem to care in a few cases. On FC15 it would
> unilaterally decide to do fallback on > 2048 pixel wide Intel i9xx
> displays. I assume this was because the X driver had some 3D bugs in
> that case.
>
> So it's a bit smarter rule and policy wise than you give it credit for.
>
> It should certainly be "working" in FC15 even for most Intel configs, and
> in FC16 it works on a Radeon HD2450 although it's got a few small bugs
> now and then.
>
> Alan
>
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