[prev in list] [next in list] [prev in thread] [next in thread] 

List:       freedesktop-xorg
Subject:    How do I debug DisplayPort hotplug detection?
From:       Marius Gedminas <marius () gedmin ! as>
Date:       2014-01-14 12:16:03
Message-ID: 20140114121603.GB22548 () platonas
[Download RAW message or body]

[Attachment #2 (multipart/signed)]


I've got a Lenovo ThinkPad X220 with Intel graphics.  When I plug in a
VGA cable, my desktop automatically notices it and reconfigures the
desktop.  When I use a DisplayPort -> DVI cable, this doesn't happen and
I have to run xrandr by hand (with no arguments is fine, merely querying
RANDR makes the driver notice I plugged in the cable).

So far I filed an Ubuntu bug[1], tried to upgrade my BIOS (well, UEFI, I
suppose), tried the latest upstream kernel.  No luck.

  [1] https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1263681

How can I debug this?  Which component is supposed to detect these
events -- the kernel driver or the userspace bits in X.org?  If it's the
kernel, what's the mechanism it uses to notify userspace about that
event?  How does X notify clients about newly appearing monitors?  What
command-line tools are there to watch for these events (not) showing up?
What's the appropriate upstream for this bug?

Marius Gedminas
-- 
Well, there's a quantum computer that can factor 15, so those of you using
4-bit RSA should worry.
        -- Bruce Schneier

["signature.asc" (application/pgp-signature)]

_______________________________________________
xorg@lists.x.org: X.Org support
Archives: http://lists.freedesktop.org/archives/xorg
Info: http://lists.x.org/mailman/listinfo/xorg
Your subscription address: %(user_address)s

[prev in list] [next in list] [prev in thread] [next in thread]