Comment # 49 on bug 1183425 from Cliff Zhao

(In reply to Gerald Pfeifer from comment #48)
> Created attachment 850905 [details]
> Screenshot after following instructions in comment #46
> 
> Following the actions/instructions in comment #46 I rebooted into that
> kernel and IT WORKS!
> 
> The positioning of the text may not be optimal (I'd put it a little 
> lower or, as previously, above the entry field), but it's there, well
> readable, and no undesired visual artifacts.
> 
> Good detective work, Cliff! :-)
> 
> Does this provide what you need to tackle this?

Thank you, Gerald, for your time, seems I have known the cause of this problem.
And as for your suggestion, I will consider it carefully, sooner or later I
will accomplish it. :-)