Bug 21788

Summary:	[i915 i965]readpix failed when toggle front/back
Product:	Mesa	Reporter:	Yifei Chen <yifei.chen>
Component:	Drivers/DRI/i965	Assignee:	Eric Anholt <eric>
Status:	VERIFIED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	shuang.he
Version:	git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	screen shot of readpix after toggle front/back xorg log dmesg

Description Yifei Chen 2009-05-18 02:17:39 UTC

Created attachment 25957 [details]
screen shot of readpix after toggle front/back

when run readpix of mesa demos, if we press t to toggle front/back, the display of the right window(CopyPixels) is not correct. see attachment for screenshot.

tested on:
Arch:           x86_64
OSD:            Fedora release 10 (Cambridge)
Kernel_version:         2.6.30-rc5 with KMS
Libdrm:         (master)f57d7f4b0b14972f92a83f155ae8033478aa7729
Mesa:           (master)08ec7e0d329a72433b427e8167b2c3442d1f53b4
Xserver:                (master)2f6253376df45e508284ff7766b186cfc7fb56d6
Xf86_video_intel:               (master)87332a7cc16af82aa47e07fbf90da3635b071dbf

Comment 1 Eric Anholt 2009-07-02 13:05:38 UTC

Need to know your chipset, Xorg.0.log, and dmesg.


Works fine on my GM45.

Comment 2 Shuang He 2009-07-12 19:10:32 UTC

I can reproduce this issue with following configuration on Q35:
libdrm: (master) 790097c51330090b2b7b90429b9ab8ddf259fd8e
mesa: (master) 7266e33abd9723fcec47933ed9ff4132abbd6eba
xserver: (master) bf0f3b8f2bc830c8bd6f8f9410b89394b8d96257
xf86-video-intel: (master) f6f79eb629184366b1355743d601129a526da90c

Comment 3 Shuang He 2009-07-12 19:11:14 UTC

Created attachment 27620 [details]
xorg log

Comment 4 Shuang He 2009-07-12 19:11:53 UTC

Created attachment 27621 [details]
dmesg

Comment 5 Eric Anholt 2009-08-03 14:34:23 UTC

commit fd65418f600874b05f902b622078b40bc1abb24a
Author: Eric Anholt <eric@anholt.net>
Date:   Mon Aug 3 14:27:41 2009 -0700

    intel: Fix inverted test for disabling flushing of front buffer output.
    
    The comment disagreed with the code, and nicely drew my eyes to what was
    going wrong.
    
    Bug #21774 (blender)
    Bug #21788 (readpix)

Comment 6 Adam Jackson 2009-08-24 12:32:14 UTC

Mass version move, cvs -> git

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.