Screen fading out and in.

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# 8  
Old 09-11-2017
There may also be options for controlling this hidden in /proc/acpi or /sys/, I've seen some laptop hardware do that.
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hicksd8 (09-12-2017) kkeevv (09-14-2017)
# 9  
Old 09-12-2017
Quote:
Originally Posted by Corona688
Are you in the physical terminal when this happens? (i.e. ctrl-alt-f1 -- ctrl-alt-f7 ) Terminal blanking there is a kernel option, I think.
NO
# 10  
Old 09-12-2017
@Corona688.......I reckon your post#8 is exactly on track. This Ubuntu installation thinks it's on a laptop. The OP says that the screen doesn't go completely black. The OS is trying to change the backlight. Yes, that's a ACPI fix. We also know well that Ubuntu open source display drivers have particular problems with Intel graphics.

Search the web for 'Ubuntu', 'backlight', 'Intel graphics', etc.

This looks weird until you consider a laptop installation then it suddenly becomes very common.
# 11  
Old 09-14-2017
Quote:
Originally Posted by Corona688
Are you in the physical terminal when this happens? (i.e. ctrl-alt-f1 -- ctrl-alt-f7 ) Terminal blanking there is a kernel option, I think.
No. It is happening at the GUI while doing simple things ie playing mine sweep, or using firefox. It even occurs if nothing is loaded. It is random, but i have noticed it happens more, the longer the computer is powered up. When I reboot the problem goes away. Sometimes I can spend hours on line with no problem. I let the PC set a few hours and come back and the problem starts or doesn't.

I have since removed Ubuntu from 1st ("dual boot") PC in order to test Solaris 11.

---------- Post updated 09-14-17 at 07:55 AM ---------- Previous update was 09-13-17 at 11:38 PM ----------

Quote:
Originally Posted by Corona688
There may also be options for controlling this hidden in /proc/acpi or /sys/, I've seen some laptop hardware do that.
That sounds reasonable to me, but what do I know.

There is one file in /proc/acpi named wakeup. I don't understand it's contents...

Device S-state Status Sysfs node
VBTN S4 *enabled platform:PNP0C0C:00
PCI0 S5 *disabled no-busSmilieci0000:00
PCI4 S5 *disabled pci:0000:00:1e.0
PCI2 S5 *disabled pci:0000:00:1c.0
PCI3 S5 *disabled
PCI1 S5 *disabled pci:0000:00:01.0
PCI5 S5 *disabled
PCI6 S5 *disabled
MOU S3 *disabled
USB0 S3 *enabled pci:0000:00:1d.0
USB1 S3 *enabled pci:0000:00:1d.1
USB2 S3 *enabled pci:0000:00:1d.2
USB3 S3 *enabled pci:0000:00:1d.3

/sys has numerous items.

I disabled suspend and haven't experienced the problem. I'm not saying that is the cause.

I installed Solaris on the other PC that had same problem with Ubuntu and it doesn't have that issue any longer.

Thank you folks for your feed back. When I get WIFI working on Solaris, I think I'll 86 Ubuntu. I prefer Solaris's layout.
# 12  
Old 09-14-2017
Kernel/Debugging/Backlight - Ubuntu Wiki

Other info search for:

"Ubuntu backlight Intel"
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kkeevv (09-14-2017)
# 13  
Old 09-15-2017
Quote:
Originally Posted by hicksd8
Kernel/Debugging/Backlight - Ubuntu Wiki

Other info search for:

"Ubuntu backlight Intel"
Thanks for the link but its info overload Smilie I have disabled everything I can, 'suspend' and 'turn screen off' when in active. Both of which don't seem relevant to me because it happens while I'm using the PC.

I have noticed the problem doesn't present itself after a reset. The system works great after a reset, soft or hard. When I leave the system running unattended for a few hours and return it is very sluggish and the screen fade issue returns.

I'm sure you good folks good pin point the problem in minutes if you could put hands on.

At this time I consider the problem moot and don't wish to waste your time. I have installed Solaris on my other platform and prefer it's appearance over Ubuntu. I'm having issues with it that I want to focus on. When I get this issued resolved I plan on replacing this Ubuntu install with Solaris.

So, I consider this thread closed. Thank you everyone for trying to help me with this issue.

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