kern/50861: periodic errors from hdafg(4) on RADEON HD5450

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>Number:         50861
>Category:       kern
>Synopsis:       periodic errors from hdafg(4) on RADEON HD5450
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 27 04:05:00 +0000 2016
>Originator:     Izumi Tsutsui
>Release:        NetBSD 7.0
>Organization:
>Environment:
System: NetBSD mirage 7.0 NetBSD 7.0 (GENERIC.201509250726Z) i386
Architecture: i386
Machine: i386
>Description:
hdafg0 attached with RADEON HD5450 PCIe video periodically emits
the following error messages to the console:

---
 :
hdafg0: unsol: tag=3
hdafg0: unsol: display device hotplug
hdafg0: bad ELD size (0/256)
hdafg_dd_parse_info: datalen=256
 ack!
hdafg0: failed to parse ELD data
hdafg0: unsol: tag=3
hdafg0: unsol: display device hotplug
hdafg0: bad ELD size (0/256)
hdafg_dd_parse_info: datalen=256
 ack!
hdafg0: failed to parse ELD data
hdafg0: unsol: tag=3
hdafg0: unsol: display device hotplug
hdafg0: bad ELD size (0/256)
hdafg_dd_parse_info: datalen=256
 ack!
hdafg0: failed to parse ELD data
hdafg0: unsol: tag=3
hdafg0: unsol: display device hotplug
hdafg0: bad ELD size (0/256)
hdafg_dd_parse_info: datalen=256
 ack!
hdafg0: failed to parse ELD data
 :
---

It's attached as the following in dmesg:
---
 :
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled, rd/line, wr/inv ok
radeon0 at pci1 dev 0 function 0: vendor 0x1002 product 0x68f9 (rev. 0x00)
radeon0: unable to reserve VGA registers for i386 radeondrmkms hack
hdaudio0 at pci1 dev 0 function 1: HD Audio Controller
hdaudio0: interrupting at ioapic0 pin 19
hdafg0 at hdaudio0: ATI R6xx HDMI
hdafg0: HDMI00 2ch: Digital Out [Jack]
hdafg0: 2ch/0ch 32000Hz 44100Hz 48000Hz PCM16 AC3
ppb1 at pci0 dev 5 function 0: vendor 0x1002 product 0x5a37 (rev. 0x00)
 :
---

pcictl(8) says:
---
001:00:0: ATI Technologies Radeon HD 5450 (VGA display)
001:00:1: ATI Technologies Radeon HD 54xx Audio (mixed mode multimedia)
---

Note audio(4) is not attached under the hdafg0.

>How-To-Repeat:
Boot NetBSD/i386 7.0 with HD5450?

>Fix:
No idea.