[Bug 40252] New: No udev event for disconnecting VGA/HDMI cable

[Bug 40252] New: No udev event for disconnecting VGA/HDMI cable

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=40252

           Summary: No udev event  for disconnecting VGA/HDMI cable
           Product: DRI
           Version: XOrg CVS
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: qjn@gmx.de


Created an attachment (id=50402)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=50402)
Xorg.0.log

Hi,

I have an AMD Radeon HD 6310 with free radeon drivers running. Xorg version is
7.6, xserver is 1.10.3.

I tried to define a udev rule to change my monitor settings automatically when
I connect a VGA or an HDMI cable. Connecting works fine but disconnecting is
not recognized.

udevadm monitor shows:

udevadm monitor

monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[100.176249] change   /devices/pci0000:00/0000:00:01.0/drm/card0 (drm)
UDEV  [100.869104] change   /devices/pci0000:00/0000:00:01.0/drm/card0 (drm)

for connecting. For disconnecting nothing happens. 

I hope this is the right place to file this as a bug.

Every help is appreciated!

Regards

Dirk

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[Bug 40252] No udev event for disconnecting VGA/HDMI cable

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=40252

--- Comment #1 from Dirk Montgomery <qjn@gmx.de> 2011-08-20 08:25:06 PDT ---
Created an attachment (id=50403)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=50403)
dmesg

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[Bug 40252] No udev event for disconnecting VGA/HDMI cable

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=40252

--- Comment #2 from Fabian Deutsch <fabian.deutsch@gmx.de> 2011-09-22 13:07:41 PDT ---
I've got a similar problem with a Mobility Radeon HD 4300 Series card, there is
no change recognized on connect and disconnect.

Any hint where to look?

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[Bug 40252] No udev event for disconnecting VGA/HDMI cable

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=40252

--- Comment #3 from Alex Deucher <agd5f@yahoo.com> 2011-09-22 13:17:45 PDT ---
(In reply to comment #2)
> I've got a similar problem with a Mobility Radeon HD 4300 Series card, there is
> no change recognized on connect and disconnect.
> 
> Any hint where to look?

Hotplug interrupts only work for digital displays (TMDS/DP).  Analog displays
require polling.

Check your dmesg output and make sure there is an HPD pin assigned to the
digital display connector you are trying to use.  It's also possible your OEM
did not wire up the pin properly.

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[Bug 40252] No udev event for disconnecting VGA/HDMI cable

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=40252

--- Comment #4 from Fabian Deutsch <fabian.deutsch@gmx.de> 2011-09-22 13:22:42 PDT ---
Mh okay, I my observations were related to HDMI (not VGA).
Is there a way to find out if a "HPD pin [is] assigned to the
digital display connector"?

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[Bug 40252] No udev event for disconnecting VGA/HDMI cable

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=40252

--- Comment #5 from Alex Deucher <agd5f@yahoo.com> 2011-09-22 13:54:02 PDT ---
(In reply to comment #4)
> Mh okay, I my observations were related to HDMI (not VGA).
> Is there a way to find out if a "HPD pin [is] assigned to the
> digital display connector"?

Make sure your have the rlc firmware loaded as it's required for the interrupt
controller to work.

Check your dmesg.  It should show something like:
[drm] Connector 1:
[drm]   HDMI-A
[drm]   HPD2
[drm]   DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448 0x644c 0x644c
[drm]   Encoders:
[drm]     DFP1: INTERNAL_UNIPHY

In this case HPD2 has been (in theory) wired to the hdmi port.  Plug/unplug in
your hdmi port and check if bit 1 of any of the DC_HPDx_INT_STATUS regs changes
when you connect/disconnect the monitor.

#define DC_HPD1_INT_STATUS                                0x7d00
#define DC_HPD2_INT_STATUS                                0x7d0c
#define DC_HPD3_INT_STATUS                                0x7d18
#define DC_HPD4_INT_STATUS                                0x7d24
#define DC_HPD5_INT_STATUS                                0x7dc0
#define DC_HPD6_INT_STATUS                                0x7df4

You can use radeonreg:
http://cgit.freedesktop.org/~airlied/radeontool/
to dump registers.  E.g. (as root),
./radeonreg regmatch 0x7d00

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[Bug 40252] No udev event for disconnecting VGA/HDMI cable

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=40252

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #6 from Alex Deucher <agd5f@yahoo.com> 2011-10-07 11:14:49 PDT ---


*** This bug has been marked as a duplicate of bug 41561 ***

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