[Q] Screen doesn't turn on

m3gz · Jan 20, 2014

I am having some screen issues with my doubleshot. Basically my screen would not turn on but I know everything still works. I am able to listen to music, pick up calls, unlock the phone, etc.

It seems to happen randomly. Pressing the middle button or the power button only makes the buttons glow but doesn't turn on the screen.

Pulling out the battery and forcing the phone to restart solves the problem. Is there a solution or a more graceful way of getting the screen to come back on?

Edit:
Forgot to mention that it happens to my on JellyBean DS and KitKat DS by Emmanuel U.
Was using CM 9.1 by scverhagen and the issue doesn't happen as often. Once a week where has the JB and KK happens atleast once a day.

daswerk · Jan 20, 2014

I have the same problem too. For awhile thought it was to an app I moved to sd card (walgreens). Wasn't as often moving app off sd card.

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dilinger1111 · Jan 21, 2014

m3gz said:
I am having some screen issues with my doubleshot. Basically my screen would not turn on but I know everything still works. I am able to listen to music, pick up calls, unlock the phone, etc.

It seems to happen randomly. Pressing the middle button or the power button only makes the buttons glow but doesn't turn on the screen.

Pulling out the battery and forcing the phone to restart solves the problem. Is there a solution or a more graceful way of getting the screen to come back on?

Edit:
Forgot to mention that it happens to my on JellyBean DS and KitKat DS by Emmanuel U.
Was using CM 9.1 by scverhagen and the issue doesn't happen as often. Once a week where has the JB and KK happens atleast once a day.

I've seen this happen as well with various roms as well (including 9.1). I currently am using tbalden's 10.1, and haven't seen it in forever. I don't know if he fixed it, or I've just been lucky.

m3gz · Jan 29, 2014

I have a feeling that it might be the minimum frequency processor settings. The default settings that Emmanuel set seem pretty aggressive.

I am going to:

increase my minimum frequency to 540MHz (and incrementally lower it until it becomes unstable)
keep my maximum frequency at 1512 MHz
set CPU governor to ONDEMAND

Battery shouldn't be too much of a problem for me since I upgraded to 3500 mAh.

daswerk, have you tried playing around with your processor settings?

Ziida · Jan 30, 2014

m3gz said:
I have a feeling that it might be the minimum frequency processor settings. The default settings that Emmanuel set seem pretty aggressive.

I am going to:

increase my minimum frequency to 540MHz (and incrementally lower it until it becomes unstable)

keep my maximum frequency at 1512 MHz

set CPU governor to ONDEMAND

Battery shouldn't be too much of a problem for me since I upgraded to 3500 mAh.

daswerk, have you tried playing around with your processor settings?

540 minimum sounds a bit high to me unless your phone wasn't stable on stock ROM either. Maybe try 192? You could also try lowering your max to the stock 1.2ghz

daswerk · Jan 31, 2014

I keep mine at 1512 too. Low at 192, going to try 384 for a bit. I have not had the problem for awhile though.

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m3gz · Feb 2, 2014

Ziida said:
540 minimum sounds a bit high to me unless your phone wasn't stable on stock ROM either. Maybe try 192? You could also try lowering your max to the stock 1.2ghz

Thanks for the advice.
I remember having my max frequency at 1512 MHz before so I thought that wasn't a problem.
So far 540 MHz minimum has kept my phone from going blank. I'll try 192 Mhz next

Saem persun · Feb 2, 2014

I've tried to set 192 Mhz as a minimum rate - and got black screen anyway.

m3gz · Feb 18, 2014

Saem persun said:
I've tried to set 192 Mhz as a minimum rate - and got black screen anyway.

192 MHz worked for me. You can try doing something extreme like what I did to see if it's the minimum frequency. It may decrease battery a bit but it's better than having the annoying black screen. I tried 540MHz as a test frequency.

Not all processors are the equal. So what may work for some may not work for others.

OfficerJimLahey · Mar 27, 2014

Same problem here. Black screen on Doubleshot with CM 10.1. Made me really concerned when it happened, as I was was reading the hardware maintenance thread earlier today (for fun) so I thought the LCD went.

This is the first time this has happened in the three weeks I had this phone, and I've been on 10.1 for almost a week now.

Because battery life[1] is an issue for me as well, I edged things up only slightly (from 96 MHz to 128), hopefully that will do to the trick. If not, I will try 192 MHz.

[1] Speaking of which, any tricks on keeping battery usage low? I use Deep Sleep Battery Saver which helps out a lot. And I'm selective about my apps (removed Songza because it was hanging around while closed, eating up battery life). GPS stays off, although I keep Wi-Fi and 3G on. It looks like the screen becomes the biggest draw at this point. Any advice would be appreciated.

OfficerJimLahey · Jul 3, 2014

Since the problem in March, I have upped the minimum frequency to 192mHz. For the longest while I haven't had any issues.

But since I installed my new Anker battery (was on a half-in-the-bag EZO Power 1900mAh), the problem came back, happened twice now, a week apart.

I'm trialing KitKatDS right now, but will probably go back in a week or less due to wakelock (Android OS) issues. Judging by above, when I do I will bump up the minimum even higher. Hard to see the correlation with how the battery will be causing it, but I see no other change.

m3gz · Jul 4, 2014

Upping the lower end frequency seemed to work for a bit but i'm still getting the screen issues. I'm using a 3500mAh battery from China but I'm just doubting that the battery affects the screen.

The correlation of frequency to screen issues could also be coincidental.

OfficerJimLahey · Jul 4, 2014

m3gz said:
The correlation of frequency to screen issues could also be coincidental.

I wonder if the scheduler has anything to do with screen as well, that is, if CM uses a different one from stock?

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[Q] Screen doesn't turn on

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