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Today's Topics:
1. Re: Android Screen Affects Boot!? (OT) (Peter Hemmings)
2. Re: Android Screen Affects Boot!? (OT) (Alex Butcher)
3. Re: Android Screen Affects Boot!? (OT) (Peter Hemmings)
4. Re: Android Screen Affects Boot!? (OT) (Rayner)
5. Re: Android Screen Affects Boot!? (OT) (Peter Hemmings)
----------------------------------------------------------------------
Message: 1
Date: Fri, 09 May 2014 12:59:49 +0100
From: Peter Hemmings <peter@hemmings.eclipse.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Android Screen Affects Boot!? (OT)
Message-ID: <536CC335.9070704@hemmings.eclipse.co.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 09/05/14 10:39, Alex Butcher wrote:
> On Fri, 9 May 2014, David Smith wrote:
>
>>> From: bristol-bounces@mailman.lug.org.uk [mailto:bristol-
>>> bounces@mailman.lug.org.uk] On Behalf Of Peter Hemmings
>>> During my conversation with a reasonable "Techy" he informed me that
>>> if I
>>> had my finger on the edge of the screen while its booting, the screen
>>> calibration is corrupted and the "Android Buttons" will/may not work!
>>>
>>> Is this correct, if so, I think its a pretty poor design?
>>> If it has to calibrate at boot then there should be some sort of
>>> warning to
>>> keep your digit off its face!
>>
>> Sounds plausible. Capacitative touchscreens work by measuring changes in
>> capacitance from the background "default" caused by the presence of your
>> finger, so when it boots it needs to work out what the "background
>> default" is, and if you have your finger already on the screen, it
>> will be
>> confused what the "default" is. Different devices might work in
>> different
>> ways, though - some of them might re-calibrate in use, which would
>> resolve
>> that problem. I guess it depends on how it is designed.
>
> David says nearly everything I was planning on saying.
>
> The main thing I'd add would be that I'd expect a power cycle to reset the
> calibration if it doesn't automatically re-calibrate whilst in use.
>
> I'd also add that I've not seem anything unusual on either my month-old
> SIM-free Moto G or my partner's 6 month old Tesco-branded Moto G.
I will check if my next one has the same "calibration" problem and let
you all know after I am back from holiday!
It may be part of the general (intermittent) problems I had where the
thing were going on when I did not touch the screen, like letters being
typed and it switching to the "Settings" window. I also bought a clip
on back and sides cover which I thought was causing the problem, but it
wasn't.
The "Techy" did say they had sold lots of them and this was the first
proper problem he had seen, he did have another where someone had
damaged the phone when trying to remove the battery.
>
> Best Regards,
> Alex
>
> _______________________________________________
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol
Regards
--
Peter H
------------------------------
Message: 2
Date: Fri, 9 May 2014 13:12:36 +0100 (BST)
From: Alex Butcher <lug@assursys.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Android Screen Affects Boot!? (OT)
Message-ID: <alpine.LFD.2.03.1405091309520.8758@nffheflf.pb.hx>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
On Fri, 9 May 2014, Peter Hemmings wrote:
> On 09/05/14 10:39, Alex Butcher wrote:
>> On Fri, 9 May 2014, David Smith wrote:
>>
>>>> From: bristol-bounces@mailman.lug.org.uk [mailto:bristol-
>>>> bounces@mailman.lug.org.uk] On Behalf Of Peter Hemmings
>>>> During my conversation with a reasonable "Techy" he informed me that
>>>> if I
>>>> had my finger on the edge of the screen while its booting, the screen
>>>> calibration is corrupted and the "Android Buttons" will/may not work!
>>>>
>>>> Is this correct, if so, I think its a pretty poor design?
>>>> If it has to calibrate at boot then there should be some sort of
>>>> warning to
>>>> keep your digit off its face!
>>>
>>> Sounds plausible. Capacitative touchscreens work by measuring changes in
>>> capacitance from the background "default" caused by the presence of your
>>> finger, so when it boots it needs to work out what the "background
>>> default" is, and if you have your finger already on the screen, it
>>> will be
>>> confused what the "default" is. Different devices might work in
>>> different
>>> ways, though - some of them might re-calibrate in use, which would
>>> resolve
>>> that problem. I guess it depends on how it is designed.
>>
>> David says nearly everything I was planning on saying.
>>
>> The main thing I'd add would be that I'd expect a power cycle to reset the
>> calibration if it doesn't automatically re-calibrate whilst in use.
>>
>> I'd also add that I've not seem anything unusual on either my month-old
>> SIM-free Moto G or my partner's 6 month old Tesco-branded Moto G.
>
> I will check if my next one has the same "calibration" problem and let you
> all know after I am back from holiday!
>
> It may be part of the general (intermittent) problems I had where the thing
> were going on when I did not touch the screen, like letters being typed and
> it switching to the "Settings" window. I also bought a clip on back and
> sides cover which I thought was causing the problem, but it wasn't.
The only thing I can think of is that Android has a general problem with UI
lag. If the processor is busy doing something and you start prodding the
screen, those input events (sometimes!) get queued up only to then be
dequeued when the processor becomes less busy - by which time the on-screen
UI may have changed and the events may well go to the wrong UI elements
(i.e. not the things that were on screen when you originally touched it).
HTH,
Alex
------------------------------
Message: 3
Date: Fri, 09 May 2014 17:13:27 +0100
From: Peter Hemmings <peter@hemmings.eclipse.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Android Screen Affects Boot!? (OT)
Message-ID: <536CFEA7.8000203@hemmings.eclipse.co.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 09/05/14 13:12, Alex Butcher wrote:
> On Fri, 9 May 2014, Peter Hemmings wrote:
>
>> On 09/05/14 10:39, Alex Butcher wrote:
>>> On Fri, 9 May 2014, David Smith wrote:
>>>
>>>>> From: bristol-bounces@mailman.lug.org.uk [mailto:bristol-
>>>>> bounces@mailman.lug.org.uk] On Behalf Of Peter Hemmings
>>>>> During my conversation with a reasonable "Techy" he informed me that
>>>>> if I
>>>>> had my finger on the edge of the screen while its booting, the screen
>>>>> calibration is corrupted and the "Android Buttons" will/may not work!
>>>>>
>>>>> Is this correct, if so, I think its a pretty poor design?
>>>>> If it has to calibrate at boot then there should be some sort of
>>>>> warning to
>>>>> keep your digit off its face!
>>>>
>>>> Sounds plausible. Capacitative touchscreens work by measuring
>>>> changes in
>>>> capacitance from the background "default" caused by the presence of
>>>> your
>>>> finger, so when it boots it needs to work out what the "background
>>>> default" is, and if you have your finger already on the screen, it
>>>> will be
>>>> confused what the "default" is. Different devices might work in
>>>> different
>>>> ways, though - some of them might re-calibrate in use, which would
>>>> resolve
>>>> that problem. I guess it depends on how it is designed.
>>>
>>> David says nearly everything I was planning on saying.
>>>
>>> The main thing I'd add would be that I'd expect a power cycle to
>>> reset the
>>> calibration if it doesn't automatically re-calibrate whilst in use.
>>>
>>> I'd also add that I've not seem anything unusual on either my month-old
>>> SIM-free Moto G or my partner's 6 month old Tesco-branded Moto G.
>>
>> I will check if my next one has the same "calibration" problem and
>> let you all know after I am back from holiday!
>>
>> It may be part of the general (intermittent) problems I had where the
>> thing were going on when I did not touch the screen, like letters
>> being typed and it switching to the "Settings" window. I also bought
>> a clip on back and sides cover which I thought was causing the
>> problem, but it wasn't.
>
> The only thing I can think of is that Android has a general problem with UI
> lag. If the processor is busy doing something and you start prodding the
> screen, those input events (sometimes!) get queued up only to then be
> dequeued when the processor becomes less busy - by which time the on-screen
> UI may have changed and the events may well go to the wrong UI elements
> (i.e. not the things that were on screen when you originally touched it).
Funny you should say that, when it froze it seemed to start working
after a minute or two and I thought that it was all being queued up!
What bugs me (excuse pun), is that I cannot see what its doing and will
need to do some research finding how I can debug it should I have more
problems.
>
> HTH,
> Alex
>
>
>
> _______________________________________________
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol
Regards
--
Peter H
------------------------------
Message: 4
Date: Fri, 9 May 2014 17:56:15 +0100 (BST)
From: Rayner <rayner+lug@anarres-worlds.org>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Android Screen Affects Boot!? (OT)
Message-ID: <alpine.DEB.2.02.1405091745590.19884@teal.anarres.org>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
On Fri, 9 May 2014, Peter Hemmings wrote:
> It may be part of the general (intermittent) problems I had where the thing
> were going on when I did not touch the screen, like letters being typed and
> it switching to the "Settings" window. I also bought a clip on back and
> sides cover which I thought was causing the problem, but it wasn't.
I have an Android phone that started having intermittent "phantom
touches" after a couple of years of use. Power-cycling or cleaning the
screen sometimes seemed to help, but often had no effect. Eventually I
took the back cover off and tightened every screw I could see by a
quarter turn. It's worked fine ever since. I assume there was a dodgy
connection somewhere...
Rayner
------------------------------
Message: 5
Date: Fri, 09 May 2014 18:45:51 +0100
From: Peter Hemmings <peter@hemmings.eclipse.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] Android Screen Affects Boot!? (OT)
Message-ID: <536D144F.8000305@hemmings.eclipse.co.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 09/05/14 17:56, Rayner wrote:
>
>
> On Fri, 9 May 2014, Peter Hemmings wrote:
>
>> It may be part of the general (intermittent) problems I had where the
>> thing were going on when I did not touch the screen, like letters
>> being typed and it switching to the "Settings" window. I also bought
>> a clip on back and sides cover which I thought was causing the
>> problem, but it wasn't.
>
> I have an Android phone that started having intermittent "phantom
> touches" after a couple of years of use. Power-cycling or cleaning the
> screen sometimes seemed to help, but often had no effect. Eventually I
> took the back cover off and tightened every screw I could see by a
> quarter turn. It's worked fine ever since. I assume there was a dodgy
> connection somewhere...
Yep, could well be that (seen many in my few decades of maintenance)
but did not have the option of removing anything without loosing
warranty. I did however try a gentle go at distorting the case with no
effect!
Only another 20 hours before I get a replacement!
>
> Rayner
>
> _______________________________________________
> Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol
Regards
--
Peter H
------------------------------
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End of Bristol Digest, Vol 549, Issue 4
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