HDMI ELD info failed to extract occasionally

HDMI ELD info failed to extract occasionally

[taiten987]

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Hi,

I found a potential bug for i915 regarding to ELD parsing.

I was trying to monitor ELD by watching "/proc/asound/card0/eld#3.0" and I
realized that the ELD might failed to read from HDMI when AC power is not
plugged.
This looks like a potential hardware or driver issue, does anyone aware of
this?
I am also looking for the right place to file the bug, please suggest.

lspci result
00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics
Controller (rev 05)
00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host
Controller (rev 04)
00:16.0 Communication controller: Intel Corporation Panther Point MEI
Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host
Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio
Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1
(rev c4)
00:1c.1 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 2
(rev c4)
00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host
Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller
[RAID mode] (rev 04)
00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)

Best Regads,
Taiten Peng

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Re: HDMI ELD info failed to extract occasionally

[Jani Nikula]

On Fri, 05 Oct 2012, "taiten987@gmail.com" <taiten987@gmail.com> wrote:
> I found a potential bug for i915 regarding to ELD parsing.
>
> I was trying to monitor ELD by watching "/proc/asound/card0/eld#3.0"
> and I realized that the ELD might failed to read from HDMI when AC
> power is not plugged.  This looks like a potential hardware or driver
> issue, does anyone aware of this?

Hi Taiten, that's a bit thin on the details. What's the exact difference
you see with AC vs. battery? Is there anything special in dmesg? If not,
how about when you enable drm.debug=0xe kernel parameter? Which kernel
version are you running?

> I am also looking for the right place to file the bug, please suggest.

https://bugs.freedesktop.org/enter_bug.cgi 
Product: DRI, Component: DRM/Intel


BR,
Jani.


>
> lspci result
> 00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics
> Controller (rev 05)
> 00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host
> Controller (rev 04)
> 00:16.0 Communication controller: Intel Corporation Panther Point MEI
> Controller #1 (rev 04)
> 00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host
> Controller #2 (rev 04)
> 00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio
> Controller (rev 04)
> 00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1
> (rev c4)
> 00:1c.1 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 2
> (rev c4)
> 00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host
> Controller #1 (rev 04)
> 00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
> 00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller
> [RAID mode] (rev 04)
> 00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)
>
> Best Regads,
> Taiten Peng
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel