From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org Subject: [Bug 104344] New: Display Adapter Chain, Cable Disconnect causes Nouveau crash Date: Wed, 20 Dec 2017 05:52:17 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1102823177==" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: nouveau-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Nouveau" To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org List-Id: nouveau.vger.kernel.org --===============1102823177== Content-Type: multipart/alternative; boundary="15137491381.E122.7008"; charset="UTF-8" --15137491381.E122.7008 Date: Wed, 20 Dec 2017 05:52:18 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D104344 Bug ID: 104344 Summary: Display Adapter Chain, Cable Disconnect causes Nouveau crash Product: xorg Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: Driver/nouveau Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Reporter: mbazzinotti-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org Created attachment 136308 --> https://bugs.freedesktop.org/attachment.cgi?id=3D136308&action=3Dedit collation of syslog grep'd for "nouveau|drm"; includes trace. there was no pertinent log info right before the trace occurred. While experimenting with physical connections to avert Flicker Bug 88272 (https://bugs.freedesktop.org/show_bug.cgi?id=3D88272) I found myself using a mini DisplayPort(mDP) adapter which has 3 outputs (HDMI, DVI, and DP), with its DP output connected to a second DP->DVI adapt= er. Let's call the first adapter A, and the 2nd adapter B. The connections are: ------- mDP --- DP --- DVI ---------=20 Laptop |-----| A |----| B |---| Monitor | ------- --- --- --------- While connected, display appeared "normal" as per Bug 88272 screen flicker. When I unplugged the DVI cable from adapter B, this trace appeared in the dmesg attachment. Dmesg Output before the trace was not relevant. This issue can = be reproduced again and again by reconnecting and disconnecting the cable. This does not crash X. The desktop appears to run just fine, even during the nouveau crash IIRC. If I was not watching dmesg, I may not have even notice= d. The problem does not happen if unplugging the root adapter from the laptop.= I have not tried unplugging the 2nd adapter to see what happens in that case. Note: When adapter A is plugged via DVI to monitor directly, unplugging the= DVI cable does not cause a crash; no call stack is outputted to dmesg in this c= ase. --------- Hardware | --------- Macbook Pro 5,4 15" mid-2009 Nvidia GeForce 9400m mini DisplayPort -> "Gigaware" DVI/HDMI/Displayport adapter -> HP DP>DVI adapter Dell LCD Monitor model E2011Hc -------- Software| -------- Gentoo Linux 4.12.12.=20 x11-base/xorg-server-1.19.5 x11-drivers/xf86-video-nouveau-1.0.15 i3wm No compositor kernel command line: ro root=3DPARTUUID=3Dxxxxxxxx net.ifnames=3D0 ----- --=20 You are receiving this mail because: You are the assignee for the bug.= --15137491381.E122.7008 Date: Wed, 20 Dec 2017 05:52:18 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated
Bug ID 104344
Summary Display Adapter Chain, Cable Disconnect causes Nouveau crash
Product xorg
Version unspecified
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Severity normal
Priority medium
Component Driver/nouveau
Assignee nouveau@lists.freedesktop.org
Reporter mbazzinotti@gmail.com
QA Contact xorg-team@lists.x.org 

Created attachment 136308 [details]
collation of syslog grep'd for "nouveau|drm"; includes trace. the=
re was no
pertinent log info right before the trace occurred.

While experimenting with physical connections to avert Flicker Bug 88272
(https://bugs.freedesktop.org/show_bug.c=
gi?id=3D88272)

I found myself using a mini DisplayPort(mDP) adapter which has 3 outputs
(HDMI, DVI, and DP), with its DP output connected to a second DP->DVI ad=
apter.

Let's call the first adapter A, and the 2nd adapter B. The connections are:


-------  mDP  ---  DP  --- DVI ---------=20
Laptop |-----| A |----| B |---| Monitor |
-------       ---      ---     ---------


While connected, display appeared "normal" as per Bug 88272 screen flicker.
When
I unplugged the DVI cable from adapter B, this trace appeared in the dmesg
attachment. Dmesg Output before the trace was not relevant. This issue can =
be
reproduced again and again by reconnecting and disconnecting the cable.

This does not crash X. The desktop appears to run just fine, even during the
nouveau crash IIRC. If I was not watching dmesg, I may not have even notice=
d.

The problem does not happen if unplugging the root adapter from the laptop.=
 I
have not tried unplugging the 2nd adapter to see what happens in that case.

Note: When adapter A is plugged via DVI to monitor directly, unplugging the=
 DVI
cable does not cause a crash; no call stack is outputted to dmesg in this c=
ase.

---------
Hardware |
---------
Macbook Pro 5,4 15" mid-2009
Nvidia GeForce 9400m
mini DisplayPort -> "Gigaware" DVI/HDMI/Displayport adapter -&=
gt; HP DP>DVI
adapter
Dell LCD Monitor model E2011Hc

--------
Software|
--------
Gentoo Linux 4.12.12.=20
x11-base/xorg-server-1.19.5
x11-drivers/xf86-video-nouveau-1.0.15
i3wm
No compositor

kernel command line: ro root=3DPARTUUID=3Dxxxxxxxx net.ifnames=3D0

-----

You are receiving this mail because:
  • You are the assignee for the bug.
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