[cairo] Render EXTEND_REPEAT bug is back...
otaylor at redhat.com
Sun Jan 27 11:34:05 PST 2008
On Sun, 2008-01-27 at 11:00 -0800, Vladimir Vukicevic wrote:
> On Jan 26, 2008, at 11:03 AM, Owen Taylor wrote:
> > On Fri, 2008-01-25 at 13:12 -0800, Vladimir Vukicevic wrote:
> >> It looks like that the ati/radeon driver is hit by the old
> >> 'buggy_repeat' bug, even with a new X server. I've got Xorg
> >> 220.127.116.11,
> >> radeon driver 6.7.197 and a more recent one built from git yesterday;
> >> both show the bug. (Tested with https://bugzilla.mozilla.org/show_bug.cgi?id=41358.)
That can't be the right bug number.
> > Are you sure it's really *the* old buggy repeat bug and not another
> > bug
> > that the same work-around code works around?
> I'm not -- the symptoms look identical, but I don't know if the
> underlying cause is the same. The mozilla bug report got updated; it
> doesn't seem to be limited to the radeon driver, people using sis and
> i810 at least are seeing it. Do we have a testcase for this? I can't
> remember if it's in the testsuite since it's platform-specific, but it
> would be good to be able to reproduce it without firefox. If we
> don't, I can put one together tomorrow.
The original bug report on the X server:
The patch attachment is no longer available (all
bugzilla.freedesktop.org attachments got scrambled some years ago), but
as you can see from the description, that bug had to do with a very
specific logic error in the core RENDER framebuffer code. I haven't
looked at the current version of that file, but it seems improbable to
me that that particular logic error was reintroduced.
So, I think the first step here is to track down and figure out what the
current X server bug you are seeing is, and what exactly is the scope of
it. Before that, trying to figure out how to work around it seems like a
risky and uncertain proposition.
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