Bug 756083

Summary: Broken Compiz appears, when 'Desktop Effects' enabled (MGA).
Product: Red Hat Enterprise Linux 6 Reporter: Vitezslav Humpa <vhumpa>
Component: xorg-x11-drv-mgaAssignee: Adam Jackson <ajax>
Status: CLOSED WONTFIX QA Contact: Desktop QE <desktop-qa-list>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.2CC: tpelka
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2011-12-14 22:09:33 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
snapshot of the desktop after enabling compiz none

Description Vitezslav Humpa 2011-11-22 16:41:12 UTC 
Description of problem:
With Matrox MG550 a HW rendering is enabled by default:

$ glxinfo | grep render
direct rendering: Yes
OpenGL renderer string: Mesa DRI G400 AGP 1x

Thus System->Preferences->Desktop Effects, does allow to enable Compiz. What appears is heavily distorted, without window decoration. Parts of Compiz are working as one can tell by the menu appearance effect etc.

Trying to enable Compiz directly leads to:
$ compiz --replace
compiz (core) - Fatal: GLX_EXT_texture_from_pixmap is missing
compiz (core) - Error: Failed to manage screen: 0
compiz (core) - Fatal: No manageable screens found on display :0.0

I make no illusions of Compiz actually being supported by or supporting the MGA driver, but if that is the case, one should not be able to enable it through the graphical 'Desktop effects' settings

Version-Release number of selected component (if applicable):
xorg-x11-drv-mga-1.4.13-3.el6 

How reproducible:
Allways

Steps to Reproduce:
Described ^^^
  
Actual results:
Compiz appears distorted and unusable

Expected results:
Enabling desktop effects is not allowed, or compiz working as expected

Additional info:
screenshot will be attached
Comment 1 Vitezslav Humpa 2011-11-22 16:42:25 UTC 
Created attachment 535106 [details]
snapshot of the desktop after enabling compiz
Comment 3 Adam Jackson 2011-12-14 22:09:33 UTC 
I'd be very surprised if this was a regression compared to RHEL6.0.  At any rate we have no plans to ever fix the mga 3D driver.