| Summary: | x11perf antialias tests leak out of test window, perform poorly | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | xorg | Reporter: | Jason Bucata <jbucata> | ||||||
| Component: | Driver/mga | Assignee: | Xorg Project Team <xorg-team> | ||||||
| Status: | RESOLVED INVALID | QA Contact: | Xorg Project Team <xorg-team> | ||||||
| Severity: | minor | ||||||||
| Priority: | high | CC: | ajax | ||||||
| Version: | 6.8.0 | ||||||||
| Hardware: | x86 (IA32) | ||||||||
| OS: | Linux (All) | ||||||||
| URL: | http://bugs.gentoo.org/show_bug.cgi?id=82532 | ||||||||
| Whiteboard: | |||||||||
| i915 platform: | i915 features: | ||||||||
| Attachments: |
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Created attachment 1957 [details]
shell script to exercise buggy X operations
Created attachment 1958 [details]
Stripped-down xorg.conf file to demonostrate bug and workarounds
Sorry about the phenomenal bug spam, guys. Adding xorg-team@ to the QA contact so bugs don't get lost in future. Mass closure: This bug has been untouched for more than six years, and is not obviously still valid. Please reopen this bug or file a new report if you continue to experience issues with current releases. |
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[This was originally filed on Gentoo's bugzilla; at the request of Gentoo devs, I'm taking this upstream for them.] Using Gentoo's xorg-x11-6.8.0-r4 on a Matrox Millennium G450 card, 32 MB RAM. Running the x11perf program, the antialiased trapezoid tests work correctly under color depths > 8 bits (I tested 24 and 16 bits IIRC). At 8 bits, these things happen: 1. The test window that all the graphics operations are displayed in is created a few pixels indented, both horizontally and vertically, from the upper left corner of the screen. Normally all tests should paint their graphics within the provided window. These tests, however, are offset up and to the left from where they should be, so that they leak out of the window and onto the desktop. The graphics operations are being painted relative to the screen--not relative to the window as they should be. 2. The performance is abysmal: Instead of a few hundred operations per second, it can take up to several minutes to perform one operation, depending on the test. It's as if hardware acceleration isn't being used, and those X operations are using (badly written) software routines. Symptom 1 is easily manifest with the aatrap1 test. Both symptoms are manifest by running a range from aatrap1 to addatrapezoid300. The ways to work around this problem are: o Change to a higher color depth o Use the VESA or fbdev drivers instead of "mga" o Turn off acceleration to make "mga" work o Set to "true" either (or both) of XaaNoScreenToScreenCopy or XaaNoOffscreenPixmaps, to make accelerated "mga" work Recompiling multiple times, I found no change by varying the MMX, SSE, or 3D-Now related Gentoo USE flags.