Bug 652933 - Artefacts displayed when kde magnifier is activated
Summary: Artefacts displayed when kde magnifier is activated
Alias: None
Product: Fedora
Classification: Fedora
Component: kdebase-workspace
Version: 14
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Than Ngo
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2010-11-13 15:40 UTC by Victor Vengerov
Modified: 2012-08-16 21:07 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-08-16 21:07:25 UTC
Type: ---

Attachments (Terms of Use)

Description Victor Vengerov 2010-11-13 15:40:07 UTC
User-Agent:       Mozilla/5.0 (X11; U; Linux x86_64; ru; rv: Gecko/20101027 Fedora/3.6.12-1.fc14 Firefox/3.6.12

When Magnifier desktop effects is enabled, magnifier switched on by pressing hot-key (Meta-=) and mouse moved, there are many horizontal and vertical lines and bars displayed on the screen, making magnifier almost unusable.

Reproducible: Always

Steps to Reproduce:
1. Run "System settings".
2. Select "Desktop effects" icon in "Workspace Appearance and Behaviour" section.
3. Select "All Effects" tab
4. In "Accessibility" section, set checkbox against Magnifier effect, and clear checkboxes against "Looking glass" and "Zoom" effects.
5. Press Meta-=, possibly multiple time.
6. Move mouse around.

Actual Results:  
Horizontal and vertical lines and bars appears on the screen, outside the magnifier area.

Expected Results:  
Screen shouldn't be damaged when magnifier moved around.

This effect observed when OpenGL compositing is enabled. I've observed it at desktop with intel driver (Intel i5 661 CPU-integrated graphics) and at notebook with NVidia GeForce GT 230M, using nvidia proprietary driver. I've tried to change OpenGL settings (OpenGL mode, Texture Filter, direct rendering) at desktop with integrated graphics, without success.

When compositing type switched to XRender, magnifier works much better although notably slower, nevertheless some "shadows" displayed from time to time. Also, in XRender mode, there is no black frame around the magnifier area.

Magnifier works well before upgrade to Fedora 14.

Comment 1 Fedora End Of Life 2012-08-16 21:07:27 UTC
This message is a notice that Fedora 14 is now at end of life. Fedora 
has stopped maintaining and issuing updates for Fedora 14. It is 
Fedora's policy to close all bug reports from releases that are no 
longer maintained.  At this time, all open bugs with a Fedora 'version'
of '14' have been closed as WONTFIX.

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