Bug 1321441

Summary:	RTL-SDR doesn't auto-detach kernel driver
Product:	[Fedora] Fedora	Reporter:	Benji Wiebe <benjiwiebe>
Component:	rtl-sdr	Assignee:	Jaroslav Škarvada <jskarvad>
Status:	CLOSED WORKSFORME	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	23	CC:	benjiwiebe, jskarvad
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Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2016-03-30 04:06:30 UTC	Type:	Bug
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Benji Wiebe 2016-03-27 04:01:46 UTC

Description of problem: RTL-SDR was not compiled with auto-remove of driver turned on.

Steps to Reproduce:
1. Unplug RTL device.
2. Plug in RTL device.
3. Run gqrx or some other program that uses an RTL-SDR.

Actual results:
Gets an error message: Kernel driver is active, or device is claimed by second instance of librtlsdr.
In the first case, please either detach or blacklist the kernel module
(dvb_usb_rtl28xxu), or enable automatic detaching at compile time.

Expected results:
No error.


Additional info:
This can be fixed by using -DDETACH_KERNEL_DRIVER=ON with CMake, or --enable-driver-detach with autotools.

Comment 1 Jaroslav Škarvada 2016-03-29 09:28:50 UTC

Hmm, it should be already compiled in:
-- Building with kernel driver detaching enabled

And IIRC it always worked for me.

Comment 2 Jaroslav Škarvada 2016-03-29 09:47:06 UTC

I retried on f23 and it worked as expected:
Detached kernel driver
Found Rafael Micro R820T tuner
Exact sample rate is: 1500000,014901 Hz
Reattached kernel driver

Comment 3 Benji Wiebe 2016-03-30 04:06:30 UTC

Funny. It works for me now, too. I wonder if I was running it as a different user or something.