Created attachment 1074928 [details] snip from /var/log/messages -NOT WORKING kernel 4.1.6-100.fc21.x86_64 Description of problem: I have a USB stick DVB-T with a Realtek RTL2832U Version-Release number of selected component (if applicable): 4.1.6-100.fc21.x86_64 How reproducible: every time. Steps to Reproduce: 1. Update kernel. 2. start VLC to watch TV 3. Actual results: no longer working. Expected results: used to allow me to watch DVB-T Additional info: Booting back to previous kernel 4.1.5-100.fc21.x86_64 makes it work again
Created attachment 1074929 [details] snip from /var/log/messages -WORKING kernel 4.1.5-100.fc21.x86_64
When you filter out the duplicate messages, everything looks identical between the two dmesg. There aren't any changes to the media subsystem between 4.1.5 and 4.1.6 or anything major in USB. Can you be a bit more specific as to what isn't working?
hi Laura > Can you be a bit more specific as to what isn't working? The exact sequence of actions that has been working for me is: I have a textfile that I generated containing the mapping of frequency&multiplex information -> TV channel name I right click on the file and open it with VLC. VLC displays the desired TV channel (with sound) Now, since I updated the kernel, when I do this- I get no TV picture and no sound. When I boot back into an older kernel it works as it always has. If you would like to suggest any further tests that might help collect useful information please just leave instructions here and I will be happy to attempt to follow them. :-)
Your best bet is to try bisection either manually on the kernel or with the help of some scripts https://pagure.io/fedbisect. Alternatively, you can send an e-mail directly to the maintainers to see if they have any ideas: Antti Palosaari <crope> Mauro Carvalho Chehab <mchehab.com> linux-media.org linux-kernel.org
Thankyou Laura. I have installed with git clone https://pagure.io/fedbisect and started ./setup-pkg-git.sh It looks like this is going to take a while. I will report back if I find out anything interesting. :-)
Unfortunately I didn't make much progress attempting the bisect because of this error: [colin@k8 fedora]$ ./fedbisect.sh start 4.1.5-100.fc21 4.1.6-100.fc21 bad tag 4.1.6-100.fc21 Usage: ./fedbisect-start.sh <good revision> <bad revision> bad and good revision must be valid tags in the git tree [colin@k8 fedora]$ Both kernel version strings are identical to those from uname and koji and comply with the guidance here: https://pagure.io/fedbisect/blob/master/f/README.rst Any advice as to how to proceed would be appreciated. Colin.
The fedora kernel.org tree is missing those tags so the scripts won't work :(. Thanks for trying the scripts and finding limitations of them. At this point your options are either to try a bisect between 4.1.5 and 4.1.6 on a regular kernel.org tree or reporting the issue to the maintainers upstream directly to see if they have any ideas.
Ok Laura. kernel build 4.1.7-100.fc21.x86_64 finally made it out to the mirrors and it works for me- so whatever the issue was it would seem to be specific to that one build. I will leave it there as I will be upgrading to F22 then F23. Thanks for your help. Colin
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