[Samsung Infuse 4G] electricpete1:
I wanted to provide an update of testing I have done with UV on my phone. Nothing conclusive for me yet, just a lot of data.

I’ll discuss 5 different UV settings labeled below as 0, A, B, C, D (going from most UV to least UV).

About notation - I think it is helpful to list UV settings in the full format I use (rather than just how many volts down) for two reasons:

1 – The reference voltages vary depending on kernel. So it could be misleading to report what the reduction in voltage is without reporting the reference. At 1200Mhz, Zen’s Infusion A/B uses 1275millivolts while Entropy’s DD uses 1300millivolts (voltages match at other frequencies). I’m not sure what the voltages are in stock kernel.

2 – Listing the final voltages allows you to see how much jump in voltage there is from one frequency to the next (large jump could possibly increase instability)... this aspect is not as obvious if we just list how many volts below the reference.

Setting set 0

100 Mhz: 950mv max – 100mv = 850 millivolts

200 Mhz: 950mv max – 100mv= 850 millivolts

400 Mhz: 1050mv max – 100mv = 950 millivolts

800 Mhz: 1200mv max – 100mv = 1100 millivolts

1200 Mhz: 1275mv max – 100mv = 1175 millivolts

1600 Mhz: 1400mv max – 50mv = 1350 millivolts

Duration: Tested less than one day.

Results: Reported in original thread: caused unwanted reboot while surfing. After that the battery indicator jumped.

Setting set A.

100 Mhz: 950mv max – 75mv = 875 millivolts

200 Mhz: 950mv max – 50= 900 millivolts

400 Mhz: 1050mv max – 75mv = 975 millivolts

800 Mhz: 1200mv max – 100 mv = 1100 millivolts

1200 Mhz: 1275mv max – 75mv = 1200 millivolts

1600 Mhz: 1400mv max – 100mv = 1300 millivolts

Duration: Tested 3 days heavy use

Results:

* “Rainbow Screen After Trap Game” – I tried the game “Trap” which was recommended in a thread somewhere as being a good test to find stability problems using UV. Sure enough upon exiting the game once, my screen turned to rainbow colors. I rebooted to restore screen to normal (same UV). I played the game for 15 minutes exiting a few more times, no more problems.

* “Widgets Lost” - Once after reboot I lost all my widgets (Tasker, Color Notes, Elixir). They did not come back even when I went to stock voltages and rebooted. Had to manually restore each of my widgets.

* “Discolor Upon Screen On” - Once in awhile when turning on screen, some colors are initially wrong (mostly I notice the white labels of my icons are yellow or pink). It goes away very quickly - either after I touch the screen or after scroll around a little. After that everything is normal.

* “Flash Upon Screen On” - Once in awhile when turning on the screen, I see a white flash for a fraction of a second (sort of like with an old TV tube when you turn it on or off). After that everything is normal.

These last two symptoms (“Discolor Upon Screen On” and “Flash Upon Screen On”) occurred probably once per day over the course of the three days relatively heavy usage.

Setting set B

100 Mhz: 950mv max – 25mv = 925 millivolts

200 Mhz: 950mv max – 25= 925 millivolts

400 Mhz: 1050mv max – 25mv = 1025 millivolts

800 Mhz: 1200mv max – 75 mv = 1125 millivolts

1200 Mhz: 1275mv max – 50mv = 1225 millivolts

1600 Mhz: 1400mv max – 75mv = 1325 millivolts

Duration tested: 3 days heavy use

Results:

* “Discolor Upon Screen On” – Same as above. 2 or 3 times over three days heavy use

* “Flash Upon Screen On” – Same as above. Once over three days.

setting set C

100 Mhz: 950mv max – 15mv = 935 millivolts

200 Mhz: 950mv max – 15= 935 millivolts

400 Mhz: 1050mv max – 15mv = 1035 millivolts

800 Mhz: 1200mv max – 50 mv = 1150 millivolts

1200 Mhz: 1275mv max – 25mv = 1250 millivolts

1600 Mhz: 1400mv max – 50mv = 1350 millivolts

Duration Tested: 3 days heavy use

Results:

* “Discolor Upon Screen On” – Same as above. 2 or 3 times

(Did not have the Flash upon screen on)

setting set D = 0 undervolt – use Zen’s default settings.

Duration: about 2 weeks experience with GB in this configuration

“Discolor Upon Screen On” – Never saw it

* “Flash upon screen on” – Never saw it, but did see a similar flash just once in my phone application when I removed phone from ear to look at keypad.

** EDITED TO ADD - Today after posting this, I noticed the flash upon screen on" while using no UV, 100-1200Mhz. Maybe I just wasn't looking for it before.

Other Testing Using Specific Applications:

I did a lot of testing with these programs on settings A, B, C and saw no anomalies. For settings A, B, and C, did the following:

SetCPU “Stress Test” for approximately one minute

“Stability Test” Applicaiton– “Scaling Stability Test” subtest for approx 20 minutes (battery gets up to about 115F).

“Stability Test” Applicaiton – “CPU+GPU Stability Test” subtest for approx 10 minutes (actually did this only in B, C, didn't try it in A)

I played the game "Trap" (that caused the problem in setting A) for 15-20 minutes in B, C, exiting and reentering a few times. Didn't see any problems.

Interestingly, when I run Quadrant it sometimes flakes out (returns to Quadrant start screen without any result) and somtimes run to conclusion. But this happens even on stock voltages, and I think I remember it's a problem with Quadrant that others have seen, so I’m inclined to think it is not an indicaion of instability I should worry about.

Analysis:

It looks like B is the most UV I can apply without significant problems appearing during 3-day test. But I still had some minor anomalies I notice occasionally when turning screen on (brief flash and brief discoloration),.but they occur to certain extent even at less UV (C) and at zero UV (D)

All of the above real-life testing in A, B, C was done with max frequency of 1200 (because I wanted to rule out 1600 as a problem).

I used 1600 only during the specific stability test appliations.. that ran fine and also in the D configuration that ran fine. So the problems (if they are problems) come from UV, not from using 1600Mhz.

Questions:

Do you think discoloration upon turning on the screen or flash upon turning on is cause for concern? The symptom itself is not an inconvenience but I’m wondering if it’s warning me about something else going on...(***)

I don’t really have a feel for what change in battery life occurs with these different settings. Seems very difficult to quantify. Any thoughts?

By the way, I'm using ULCB3 stock rooted GB. Using Zen's Infusion-A kernel. cpu control using setcpu: Mostly 100-1200Mhz cpu frequency, conservative cpu governor with the Up/Down threshholds tweaked to 95/45, noop io scheduler.

I installed this configuration about a month ago using qkster's Heimdall one-click.Never had any problems other than those mentioned above which may or may not be problems.

*** I have to confess, I wiped Davlick cache and wiped the other cache at that time, but never did the "factory data wipe" because I had data on my phone that wasn't backed up. I'm not sure if those particular instructions required factory data wipe or not but I remember it was mentioned as good practice. It occurs to me maybe these subtle brief strange symptoms upon turning on the screen are remnants from incomplete wipe?