Re: Multiple issues with wallpaper handling

["Tomas M." <tmezzadra gmail com>]

i have:

- gnome 3.2
- intel gma945
- dual screen
- wallpaper zoomed

changed wallpaper. everything works as expected. no slowdowns.


sorry

On 12/01/2011 10:58 PM, Chris Dekter wrote:
> Hi list,
>
> I am experiencing a very frustrating performance gremlin on my 
> workstation with a dual-monitor setup. I have been trying for weeks to 
> nail down the source of the problems, and have finally figured out 
> that it is a combination of issues centering on wallpaper handling. 
> Firstly my system:
>
> Ubuntu 11.10 x86_64 with Gnome 3.2.1
> Various kernel versions tested in the 3.0 and 3.1 series (all show the 
> same symptoms)
> Radeon HD 5750 with 1GB RAM running the open drivers
> Two 24" monitors at 1920x1200@60hz
> (base system is Core i7 with 8GB of RAM)
>
> When I initially load shell, everything is smooth as butter. However, 
> when I perform any of the following tasks, the overview animation 
> slows to a crawl (although all other animations are still fine):
> - Lock the screen using Ctrl+Alt+L and then unlock
> - Change the wallpaper (image, svg or colour, doesn't matter)
>
> If I disable Nautilus from displaying the desktop (using 
> gnome-tweak-tool), matters improves somewhat, but there is still a 
> drastic drop in overview performance as soon as the wallpaper is 
> changed. If I restart shell using Alt+F2 and r, performance becomes 
> normal again. Also if I disable and then re-enable the second monitor, 
> performance is recovered.
>
> I believe that this is a bug in the wallpaper handling in Gnome Shell. 
> My theory is that an excessive number of copies of giant wallpaper 
> pixmaps are being loaded into graphics memory. I also believe that 
> possibly under some conditions the wallpaper pixmap is being loaded 
> into memory not at the individual monitor's resolution, but at the X 
> screen's resolution (in my case 3840 x 1020). I also think that 
> possibly wallpaper pixmaps are not being removed from memory when a 
> new wallpaper is set. Combine these issues, and you get a set of 
> pixmaps that will choke even a 1GB graphics card.
>
> Thanks,
> Chris Dekter
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