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Bug 670681 - Low resolution wallpaper on the external monitor while using dual-head
Low resolution wallpaper on the external monitor while using dual-head
Product: gnome-shell
Classification: Core
Component: general
Other Linux
: Normal normal
: ---
Assigned To: gnome-shell-maint
: 674636 (view as bug list)
Depends on:
Reported: 2012-02-23 13:09 UTC by Jiri Eischmann
Modified: 2013-07-08 08:11 UTC
See Also:
GNOME target: ---
GNOME version: ---

wallpaper right after setup (609.16 KB, image/jpeg)
2013-03-13 14:06 UTC, Kamil Páral
wallpaper after reboot (573.55 KB, image/jpeg)
2013-03-13 14:08 UTC, Kamil Páral

Description Jiri Eischmann 2012-02-23 13:09:34 UTC
I'm using dual-head:
1. laptop's monitor with 1280x800 resolution set up as a secondary display
2. external monitor with 1920x1080 resolution set up as a primary display

When I set up a wallpaper everything is OK and the wallpaper resolution is correct on both displays (the wallpaper's original resolution is 1920x1200). After I log out and log back in, the wallpaper's resolution on the external monitor is lower than necessary and it's blurry. I've tried different wallpapers (with resolutions always higher than the larger monitor's one), and different wallpaper layout (tiled, stretched,...) always with the same result.

Looks like GNOME saves a thumbnail of the wallpaper in the resolution of laptop's monitor and when logged in again it uses it also for the external monitor.

It seems to occur only on dual-head with different resolution ratios. It doesn't occur on my colleague's dual-head setup where there are monitors with different resolutions, but the same ratio.  

Wanted result: GNOME should use the best available resolution on all displays so that wallpapers on all displays are sharp.
Comment 1 Richard Hughes 2012-02-23 13:32:31 UTC
I get this too on my setup. Latest master of everything from jhbuild.
Comment 2 Jakub Steiner 2012-10-02 23:09:21 UTC
*** Bug 674636 has been marked as a duplicate of this bug. ***
Comment 3 Kamil Páral 2013-03-13 14:06:25 UTC
Created attachment 238787 [details]
wallpaper right after setup

This is how my wallpapers look like right after I set it up (i.e. set or change the wallpaper).

(JPEG because of bugzilla file size limits)
Comment 4 Kamil Páral 2013-03-13 14:08:56 UTC
Created attachment 238788 [details]
wallpaper after reboot

This is how my wallpapers look like after I reboot.

(JPEG because of bugzilla file size limits)

It is not much noticeable in this case, but for some wallpapers the zoomed one (the right one) gets really blurry and ugly.

I have an internal 1366x768 laptop screen on the left and an external 1680x1050 screen on the right.
Comment 5 Bastien Nocera 2013-04-19 07:53:07 UTC
Do you still see this in GNOME 3.8?

Reassigning to gnome-shell as it's responsible for displaying the background wallpaper now.
Comment 6 Kamil Páral 2013-07-08 08:08:21 UTC
This is fixed in GNOME 3.8 (Fedora 19).

Thank you, mysterious someone!

Jiri, can you close this please?
Comment 7 Bastien Nocera 2013-07-08 08:11:04 UTC
It's probably been fixed by the shell now handling the wallpaper, rather than gnome-settings-daemon. It's basically a complete rewrite. I'll close this now.