[Bug 101144] [BAT][SKL] *ERROR* failed to enable link training

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101144

--- Comment #16 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
One peculiar thing see in some of the logs at least is a double long HPD when
we turn on the panel. I wonder if there's some kind of transient glitch on the
VDD line or something that causes to panel to do some kind of off->on->off->on
transition.

To get some more debug information maybe someone could hack up a test patch
that checks the state of the HPD pin in a few places during the modeset; Eg.
just after the panel supposedly powered on and just before starting link
training, and maybe in a few places in between.

What kind of machine is this? I'm wondering of the panel power delays might be
off somehow, eg. the power cycle delay might be too short and the panel doesn't
like it if we power it back up too soon...

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170607/0ca0403e/attachment.html>