Re: Multiple problems with multiple monitors

[Basil Mohamed Gohar]

On 2014-10-13 10:23 AM, Basil Mohamed Gohar wrote: 

>  I've searched for bugs related to the specific problems I've
> been having, and I've not been able to find anything that describes what I'm
> seeing. 
>  
>  I have an HP EliteBook 840 that also comes with an UltraDock, to which I've
> plugged-in two external monitors and I use in conjunction with the built-in laptop
> display. 
>  
>  Issue #1: I use LUKS to encrypt my disk, and when I first start up the computer, after
> choosing the kernel to boot into in GRUB, the GUI prompt for the LUKS passphrase shows-up
> on the middle monitor, not the laptop's built-in display. I don't mind this when I
> have multiple monitors plugged-in, but when I boot-up without the external monitors, such
> as when I'm unplugged from the UltraDock, I now get NO GUI prompt for the LUKS
> passphrase. I can enter it, and I can see a text prompt if I hit ESC. I suspect its
> attempting to display on the now phantom, unplugged monitor. Note, it was never plugged-in
> during this cycle. The problem is, I don't even know what's instructing LUKS or
> the GUI prompt to display on any monitor, so I don't know where to go to debug this. 
>  
>  Issue #2: When I undock my laptop while logged-in, Gnome Shell just crashes. When I
> redock after the laptop has been started when unconnected, one of the two external
> monitors start-up (the one connected by VGA), but not the one connected by a DisplayPort
> connection. And, recently (but not when I first started using this laptop with the dock,
> which was about a month ago), now when I start-up with the laptop docked and both external
> monitors connected, both external monitors will be active, but the built-in display will
> show nothing. Gnome Shell reports the built-in display is active, but will not display
> anything unless I deactivate it and reactivate it via the settings "Displays"
> utility. 
>  
>  Issue #3: The monitor connected via DisplayPort display significant tearing and delay on
> the upper-right half of the screen in the form of a triangle taking-up half of the screen.
> Reading about displayport and tearing issues, I guess the idea that these were resolved in
> the past. I don't know if this is the same or something different. 
>  
>  I don't mean to use devel as a bug reporting venue, but I think these issues are
> either related or I just don't know how to address them to make significant progress
> to fixing them. Any guidance is more than welcome. Thanks! 
>  
>  -- 
>  Libre Video
>  http://librevideo.org 
So, a recent update which included a kernel update fixed issue #2, and I
was really happy. Then, another update this week, which included
multiple systemd updates, restored/rebroke issue #2 above (the
docking/undocking) issue. 

-- 
Libre Video
http://librevideo.org