[webkit-dev] layout tests cannot set Generic RGB Color Profile on headless MacPro?

Ryosuke Niwa rniwa at webkit.org
Fri Oct 7 12:06:34 PDT 2011

Yeah, layout tests fail on Mac without a screen connected to it. Chromium
buildbots use Mac minis connected to KVMs for that reason. I'm actually
surprised to learn that tests passed on a headless Mac mini.

- Ryosuke

On Fri, Oct 7, 2011 at 11:53 AM, Simon Fraser <simon.fraser at apple.com>wrote:

> On Oct 7, 2011, at 11:45 AM, Elliot Poger wrote:
> > I was having problems with lots of image mismatches running WebKit layout
> tests on a headless MacPro (10.6.8).  (The image diffs were very minor
> adjustments in scroll bar shading.)
> >
> > Eventually, out of frustration, I tried running the same test on that
> headless MacPro as well as my desktop MacPro (also 10.6.8).  The test
> succeeded on my desktop MacPro but not the headless MacPro.
> >
> > One difference I have noticed is that the Display Profile (under System
> Preferences > Displays > Color) is set to "sRGB IEC61966-2.1" (my desktop
> was set to "Generic RGB Profile").  I tried setting it to "Generic RGB
> Profile" on the headless machine, but when I closed and reopened System
> Preferences it had reverted to "sRGB IEC61966-2.1".
> >
> > I tried setting the Display Profile on my desktop to "sRGB IEC61966-2.1",
> and the color scheme was noticeably brighter... but when I ran layout tests
> afterwards, I saw that layout tests automatically set the profile back to
> "Generic RGB Profile" temporarily for the test.  When I run layout tests on
> the headless MacPro, it seems that it fails to change the color profile (and
> I don't see any error in the output of layout tests).
> >
> > I tried it on a headless Mac Mini (10.6.8) and there layout tests was
> able to change to Generic RGB Profile (and thus the tests passed).
> >
> > For now, my fix is going to be: don't run layout tests on headless
> MacPros; use headless MacMinis instead.  Is this a Known Issue?  Any
> suggestions?
> I'm aware that there are color profile issues when running pixel tests, but
> I was not aware of differences between hardware.
> We may be able to fix DumpRenderTree/WebKitTestRunner to change the color
> profile just for the test window, and not globally. I haven't tried that
> yet.
> Finally, I've noticed some changes in color profile behavior on Lion, so if
> you try running tests there, you may see a new set of problems.
> Simon
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