Hi guys,
I find an issue about the USB TV tuner, WinTV HVR950, which use em28xx
driver. The linux can't going to S3/S4 when the device attach to
USB2.0/USB3.0 ports.
[Step]
- Boot linux (either with or without x-windows)
- Attach the HVR950 to USB port.
- dmesg and lsusb to make sure the device driver has been load
sucessfully
- pm-suspend [--quirk-s3-bios]
- the screen show black light and hung
Then I do some research about it and find it seems caused by the
em28xx-alsa module that can't implement some call back function about
suspend and resume.
After I make the em28xx-alsa.ko not installed by comment one line in
em28xx-cards.c below.
else if (dev->has_alsa_audio)
// request_modules("em28xx-alsa");
Then the linux can go into S3/S4. I uses kernel 3.1.0-rc1 on
Scientific Linux 6.1 do the debug. The issue can be reproduce on
Ubuntu10,04 too.
I am not familiar with linux-media driver. Is there someone know this issue?
Thanks,
Alex He
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