[09:40] <cyking> i find these instructions a bit ambiguous https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1453391/comments/14
[10:38] <ePirat> Hello
[10:39] <ePirat> I filed a kernel bug and was asked to do a full commit bisect 
[10:39] <ePirat> but I can't follow the guide on the wiki
[10:39] <ePirat> as I can't find the debian.master file where to make the changes
[10:40] <ePirat> should I just adjust the version number in makefile instead?
[12:05] <Taloth> ePirat: try ./debian.master/changelog
[12:26] <ePirat> Taloth, there is no debian.master folder
[12:26] <Taloth> http://kernel.ubuntu.com/git/ubuntu/ubuntu-trusty.git/tree/debian.master
[12:27] <Taloth> which version were you supposed to bisect?
[12:27] <ePirat> I am using the vivid repo 
[12:28] <ePirat> 3.18.6 to 3.19.x (most recent one I guess)
[12:28] <Taloth> you already bisected the released versions (package)?
[12:30] <ePirat> yes, those are the working/non-working versions I identified, I can't narrow down more as other 3.18 versions higher mess up everything making reproducing my bug impossible there
[12:30] <ePirat> the issue is that wifi stops working after some time/data downloaded
[12:31] <ePirat> even though it still shows up as connected it behaves like it is not
[12:31] <ePirat> for testing I need to be able to run the system for at least an hour while downloading stuff
[12:31] <Taloth> In the bugreport you mentioned 3.18.6 working while 3.18.11 doesn't.
[12:32] <Taloth> so I assume you'll be commit bisecting from there on.
[12:33] <ePirat> 3.18.11 shows different non working behavior than I have actually observed in 3.19 (i get popups that errors occured in the system but those seems to not really be related to wifi)
[12:33] <Taloth> what's the next lower version you checked?
[12:34] <Taloth> 3.18.0-10 or something else?
[12:36] <ePirat> let me check (need to boot the affected machine)
[12:38] <ePirat> 3.18.6-031806 was the last working version for me, 3.18.11-031811 was the one I could not test properly with
[12:38] <Taloth> As for your original question, if you check out the repo from  http://kernel.ubuntu.com/git/ubuntu/ubuntu-vivid.git the ./debian.master dir should be there.
[12:39] <Taloth> Maybe you're bisecting the upstream kernel tree? which wouldn't have debian.master
[12:40] <ePirat> I cloned from git://kernel.ubuntu.com/ubuntu/ubuntu-vivid.git
[12:42] <ePirat> I do have a debian.master folder in master, but not in my branch which I am using for bisect (which is currently at 0ce3c06)
[12:47] <Taloth> which branch are you bisecting on? seems to me like you should be using master.
[12:48] <ePirat> I followed the guide linked in the bug ticket, so I branched from master in a branch called mybisect and started the bisect
[12:54] <Taloth> which commit did you mark as good?
[12:56] <ePirat> bad: 83f803a good: f8e80fa
[12:58] <Taloth> but yeah, you're in the commit history of the upstream kernel, hence the missing debian.master. tbh, not sure how to normally deal with that.
[13:00] <ePirat> oh
[13:00] <ePirat> ok
[13:01] <Taloth> but did you install 3.18.0-14.15 from package?
[13:04] <ePirat> not sure… could you explain me how this versioning stuff works? I am confused by all the -x.x suffixes 
[13:06] <Taloth> that's because ubuntu is based on the mainline kernel, which uses different version numbers.
[13:07] <Taloth> Your problem boils down to https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_bisect_the_upstream_kernel.3F
[13:08] <ePirat> ah
[13:08] <Taloth> welcome down  the rabbit hole btw.
[13:08] <Taloth> :D
[13:09] <ePirat> :P
[13:09] <ePirat> I wish my  bug would at least be easier to reproduce
[13:11] <Taloth> i had a bug that made mono crash on users systems at unpredictable times. sometimes minutes sometimes days. Took quite some time till I isolated the kernel commit breaking it.
[13:11] <Taloth> fortunately wasn't hardware related like your wifi issue
[13:13] <ePirat> usually I would just have used an older versions but there my trackpoint click buttons do not work properly…
[13:14] <Taloth> On the other hand, now you'll helping to make the world a better place :P
[13:15] <ePirat> it seems switching kernels so often messed something up as I now get the system error popup even on previously fine kernel versions… great…
[13:15] <ePirat> and I can't even report those as report fails with some error…
[13:18] <ePirat> I wonder why no other thinkpad x250 user has had this wifi problem yet
[13:18] <Taloth> they quite possibly did, and are angry atm but don't know how to fix it.
[13:20] <ePirat> tbh, reporting the ubuntu kernel bug was one of the hardest bug reporting experiences I ever had
[13:26] <ePirat> I wonder if it wouldn't be possible to narrow it down to a few commits, since it is some wifi related thing?
[13:30] <Taloth> that's where a bisect comes in.
[13:33] <Taloth> from what I could see the bisect is 13 steps, over 7000 commits. It's going to take a while.
[13:35] <ePirat> indeed, specially since reproducing the bug takes hours sometimes
[13:38] <Taloth> but don't give up, take your time, you'll be helping out the devs immensely. It will be near impossible for them to reproduce, much less fix.
[13:40] <ePirat> ok :)
[13:41] <ePirat> I think I will reinstall ubuntu later (specially since 15.04 is officially released now) and try to narrow it a bit more down with packaged kernel versions