[systemd-devel] Console screen blanks while long running service executes

[Harry Goldschmitt]

On 8/12/15 7:22 PM, Chris Bell wrote:
> On 2015-08-12 20:19, Harry Goldschmitt wrote:
>> I just modified my grub kernel command line to add the consoleblank=0
>> parameter. That isn't the problem. First consoleblank is the kernel
>> screensaver and according to the documentation it kicks in after 15
>> minutes by default.
>>
>> What I see is a few kernel driver start up messages. Then the console
>> screen blanks for about 10 seconds. Then multi-user boot completes.
> The only other thing I can think of is when modesetting kicks in and is 
> configuring your graphics adapter? You could try adding the 'nomodeset' 
> kernel parameter to your boot, but keep in mind that you will lose 
> kernel modesetting, which could potentially cause issues with your 
> system. I'm not sure what else would cause the screen to 'blank' like 
> you are describing at that point in the boot.
>
> --Chris
>
I found it. Not a systemd issue at all. "console=ttyS0" had been dropped
from the kernel command line. Without it my Dell iDrac virtual console
went grey after GRUB boot. After I added the parameter the console 
stayed live and I could echo errors to /dev/tty1. I know everything I
need is available by journalctl, but the echos help when the system
doesn't come up far enough for journalctl to work.

Thanks for looking at this.

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