xsrc/49812: Pixbufs corruption with 24-bpp displays

[jmcneill%invisible.ca@localhost]

>Number:         49812
>Category:       xsrc
>Synopsis:       Pixbufs corruption with 24-bpp displays
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    xsrc-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 03 18:15:00 +0000 2015
>Originator:     Jared McNeill
>Release:        7.0_BETA
>Organization:
>Environment:
NetBSD empusa 7.99.5 NetBSD 7.99.5 (ODROID-C1) #466: Fri Apr  3 14:43:09 ADT 2015  Jared@Jared-PC:/cygdrive/d/netbsd/src/sys/arch/evbarm/compile/obj/ODROID-C1 evbarm

>Description:
Not sure if this is an xsrc or pkg bug.

I'm seeing corrupt pixbufs in Midori etc on ODROID-C1 when running with a 24-bpp display. The problem disappears if I run at a different display depth.

It looks strangely exactly like the display corruption I've seen on i965 with drmkms. I can reproduce it easily with the "gtk-demo" app. Here is the expected result:

 http://www.netbsd.org/~jmcneill/amlogic/pixbuf-16bpp.jpg

Here is the result of running the same test with a 24bpp framebuffer:

 http://www.netbsd.org/~jmcneill/amlogic/pixbuf-24bpp.jpg
>How-To-Repeat:
Using a 24-bpp framebuffer in X, run "gtk-demo" and double-click the "Pixbufs" test.
>Fix: