Hi,
I've also sent this query to the alsa mailing list, but I think it's
more to do with the video driver than with alsa.
The problem is that HDMI audio works fine until I start X. The
driver for the Intel(R) Mobile Intel?? GM45 Express Chipset
loads and I see a message in dmesg:
HDMI hot plug event: Presence_Detect=0 ELD_Valid=1
and sound output ceases. If I stop X, then I get
HDMI hot plug event: Presence_Detect=1 ELD_Valid=1
and sound output returns.
>From /var/log/Xorg.0.log I see:
Loading /usr/lib64/xorg/modules/drivers//intel_drv.so
..
(II) Primary Device is: PCI 0...@00:02:0
Can someone tell me what this hot plug event signifies
and is there anything I can do to stop it disabling HDMI
audio?
I have the following devices:
# lspci|egrep -i 'audio|graphics'
00:02.0 VGA compatible controller: Intel Corporation Cantiga Integrated
Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Cantiga Integrated Graphics
Controller (rev 07)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 03)
# lspci -n -s 2
00:02.0 0300: 8086:2a42 (rev 07)
00:02.1 0380: 8086:2a43 (rev 07)
# lspci -n -s 1b
00:1b.0 0403: 8086:293e (rev 03)
# lspci -vs 2
00:02.0 VGA compatible controller: Intel Corporation Cantiga Integrated
Graphics Controller (rev 07) (prog-if 00 [VGA controller])
Subsystem: Intel Corporation Cantiga Integrated Graphics Controller
Flags: bus master, fast devsel, latency 0, IRQ 30
Memory at fe400000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 9080 [size=8]
Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Count=1/1
Enable+
Capabilities: [d0] Power Management version 3
00:02.1 Display controller: Intel Corporation Cantiga Integrated Graphics
Controller (rev 07)
Subsystem: Intel Corporation Device 2a42
Flags: bus master, fast devsel, latency 0
Memory at fe800000 (64-bit, non-prefetchable) [size=1M]
Capabilities: [d0] Power Management version 3
# lspci -vs 1b
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 03)
Subsystem: Micro-Star International Co., Ltd. Device 8180
Flags: bus master, fast devsel, latency 0, IRQ 22
Memory at fe9f8000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Count=1/1
Enable-
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [100] Virtual Channel <?>
Capabilities: [130] Root Complex Link <?>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
Thanks,
Paul
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