[kwlug-disc] Xenial Xerus Ubuntu 16.04 Release Party? [was: Why would an LTS install non-LTS kernels?]

[Khalid Baheyeldin]

Yes, the xenial release itself is in April. But what I meant is that
its kernel (4.x) as an HWE for trusty is due August (per link below).

I plan to stay on Trusty for a while, until there is reason to move to
the next LTS (Xenial).

https://wiki.ubuntu.com/Kernel/LTSEnablementStack

On Wed, Mar 16, 2016 at 3:50 PM, Bob Jonkman <bjonkman at sobac.com> wrote:
>> the Xenial 16.04 kernel (4.x, due in August)
>
> Actually, it's due on 21 April 2016. There's a release party in Toronto:
>
> http://loco.ubuntu.com/events/ubuntu-ca/3330/detail/
>
> (Death Wish coffee! Mmmm!)
>
> Is there any interest in getting together for a Xenial Xerus Ubuntu
> 16.04 Release Party somewhere in KW?
>
> --Bob.
>
>
> On 2016-03-16 03:25 PM, Khalid Baheyeldin wrote:
>> Thanks for that link. That explains what I have been seeing that
>> various servers get different kernels depending on the HWE installed.
>>
>> I have finally moved everything to 14.04 (no more 12.04). On servers,
>> there is less 'exotic' hardware and therefore there are seldom any
>> surprises.
>>
>> On the desktop, it is another matter.
>>
>> Per the schedule that is in the link you provided, 14.04 will have 5
>> years of kernel 3.13, so I am good staying with that, until the time
>> comes for moving to 16.04.
>>
>> Perhaps I will try the Xenial 16.04 kernel (4.x, due in August).
>>
>> On Tue, Mar 15, 2016 at 7:09 PM, Darcy Casselman <dscassel at gmail.com> wrote:
>>> The LTS point releases ship updated kernels for hardware enablement.  The
>>> process is described here: https://wiki.ubuntu.com/Kernel/LTSEnablementStack
>>>
>>> Generally I'd expect that things that work shouldn't stop working.  But I
>>> know from experience that that assumption is naive.  It's software.  Stuff
>>> breaks.  Also, it's the kernel, and they do strange things sometimes.
>>>
>>> Darcy.
>>>
>>> On Tue, Mar 15, 2016 at 5:03 PM, Khalid Baheyeldin <kb at 2bits.com> wrote:
>>>>
>>>> Finally got around to the task of reinstalling my laptop, using the
>>>> warranty replaced SSD disk from OCZ.
>>>>
>>>> After installing Kubuntu 14.04, guvcview would not work with the built
>>>> in webcam, but another USB webcam (actually a microscope of sorts).
>>>> Both would give a black screen (no video).
>>>>
>>>> The USB webcam is supported by uvc (supposedly).
>>>>
>>>> usb 2-2: New USB device found, idVendor=1871, idProduct=7670
>>>> usb 2-2: New USB device strings: Mfr=2, Product=3, SerialNumber=0
>>>> usb 2-2: Product: USB2.0 UVC PC Camera
>>>> usb 2-2: Manufacturer: GenesysLogic Technology Co., Ltd.
>>>>
>>>>
>>>> Both were working fine with guvcview on the previous install (Ubuntu
>>>> Server 14.04, then KDE Plasma Desktop on top, so should not be much
>>>> different).
>>>>
>>>> A lengthy investigation ensued, using programs like Cheese, vlc,
>>>> qtv4l2 test, ...etc. Some of them (e.g. Cheese) would work with the
>>>> built in web cam, but not the USB webcam. Others (e.g. vlc) could work
>>>> with the USB video, but NOT using the uvcvideo driver (e.g. v4l).
>>>>
>>>> So there was something with the uvcvideo kernel module for the USB
>>>> webcam with an error like this:
>>>>
>>>> kernel: [  100.912205] uvcvideo: Failed to query (GET_DEF) UVC control
>>>> 11 on unit 3: -32 (exp. 1).
>>>>
>>>> The reason I say uvc was the culprit is that other applications using
>>>> other drivers do work.
>>>>
>>>> Luckily, I have the old disk lying around in the state it was in
>>>> before I removed it from the laptop. I probed around, and found that
>>>> the new Kubuntu install has a 3.19 kernel, while the old one Ubuntu
>>>> Server LTS was 3.13.
>>>>
>>>> So, I installed the Trusty generic image:
>>>>
>>>> $ sudo aptitude install linux-image-generic-lts-trusty
>>>>
>>>> And purged the vivid ones:
>>>>
>>>> $ sudo aptitude purge linux-generic-lts-vivid
>>>> linux-image-generic-lts-vivid linux-image-3.19.0-56-generic
>>>> linux-image-3.19.0-25-generic linux-image-extra-3.19.0-25-generic
>>>> linux-image-extra-3.19.0-56-generic
>>>>
>>>> After a reboot, both webcams work fine, as things were before.
>>>>
>>>> There is still the same error in dmesg, but things work as I want them
>>>> too.
>>>>
>>>> So, the big questions are:
>>>>
>>>> 1. Why would something that works stop working in a point release of
>>>> the kernel (remember that most devices have drivers written once, and
>>>> then not touched at all).
>>>>
>>>> 2. Why would an LTS release install a non-LTS kernel?
>>>> --
>>>> Khalid M. Baheyeldin
>>>> 2bits.com, Inc.
>>>> Fast Reliable Drupal
>>>> Drupal optimization, development, customization and consulting.
>>>> Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
>>>> Simplicity is the ultimate sophistication. --   Leonardo da Vinci
>>>> For every complex problem, there is an answer that is clear, simple,
>>>> and wrong." -- H.L. Mencken
>>>>
>>>>
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>>>
>>>
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>>
>>
>>
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-- 
Khalid M. Baheyeldin
2bits.com, Inc.
Fast Reliable Drupal
Drupal optimization, development, customization and consulting.
Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
Simplicity is the ultimate sophistication. --   Leonardo da Vinci
For every complex problem, there is an answer that is clear, simple,
and wrong." -- H.L. Mencken