Ubuntu

Blank screen after automatic screen turn off in Ubuntu 16.04

Asked by Venkata Raju

I have installed Ubuntu 16.04 in my new laptop (Lenovo Ideapad 110)

Processor: AMD A8-7410 APU with AMD Radeon R5 Graphics × 4
Graphics card: Gallium 0.4 on AMD MULLINS (DRM 2.43.0, LLVM 3.8.0

Once screen turns off automatically (Brightness & Lock setting) there is no way to login in to the system.

All i see is blank screen (it shows current time at the top right corner) and system does not respond to the keyboard and mouse actions. I had to hard reboot the system.

But this is not happening if i set the automatic Lock On (Brightness & Lock setting). I can see login screen when i move the mouse (after automatic screen turn off).

Could someone confirm if this is a bug or is there any solution for this ?

Note: Initially i have installed Mint in my laptop. Mint is also having the same problem. So i switched to Ubuntu, hoping this won't happen.

Update 01: I have noticed that if there is a time delay between automatic screen turn off and Lock and i have moved the mouse after the screen turns off, i still see blank screen. So, i have changed the 'Lock screen after' value to 'Screen turns off' and it is not showing blank screen now ( i see locked screen).

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Venkata Raju
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Venkata Raju (venkata-raju) said : 		#1

OK. I see the bug is already reported here: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1574951

I will add more information to the bug and follow it.

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Venkata Raju (venkata-raju) said : 		#2

In the attached bug the system is freezing all the time(If i understood correctly). But in my case it is only happening at the time of automatic screen turn off. I'm just wondering if i should reopen this. Any suggestions?

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Douglas McNutt (dpmcnutt) said : 		#3

I discovered a cron job that hides the problem:

# M H Dm M Dw path
# crontab -l
2,12,22,32,42,52 0-23 * * 0-7 date >>tryingtime
# 1,6,11,16,21,26,31,36,41,46,51,56 0-23 * * 0-7 date >>tryingtime

create an empty txt file , tryingtime
use crontab -l pointing to a file that contains the above as stored in a file

Moving the # you can choose every 10 minutes or every 5 minutes to keep the computer busy enough if you're not using the mouse.