KMS but AMDGPU And Black Screen

[Brian Cluff]

On 8/22/20 8:30 AM, Michael Butash wrote:
> I'm a bit more surprised HDMI still this day doesn't support DPMS-type 
> functions to some extent, even if "legacy" vs. only CEC.  Likewise I'm 
> surprised companies like samsung don't just include a DP port on their 
> TV's...
>
HDMI does support DPMS.  It just that TVs don't.  I doubt well every see 
a display port connector on a TV and/or DPMS support because that would 
rob them of being able to have an almost identical product that is only 
a slightly tweaked TV that is little to no cost to them that they can 
charge charge a whole lot more for.

> I figure at some point a developer might buy a few of these tv's and 
> realize how asinine this all is to use to resolve it, but considering 
> here we are in 2020 and my first reports of some of this stuff began a 
> decade or more ago, perhaps not.  KDE is still working on trying to 
> fix window placement a decade or two on, seeing this just today... 
> <https://www.phoronix.com/scan.php?page=news_item&px=KDE-Apps-Window-Pos>

I think the problem is today is that they DO handle changing monitor 
setups, but that they require devices to probably report themselves to 
the system for it to work.  For people using TVs, what they need to do 
is have a checkbox that says something like, "Make the current setup 
permanent".  The checkbox would essentially break the plug and play 
system completely and hard code each display to its function. The 
computer would then spray video out the port no matter what, even if it 
doesn't detect a device.

You mentioned that you were using curved Samsung TV.  That is exactly 
what I'm running as well.  This probably won't help you, but maybe 
someone else that's reading this; for my shut down needs I set the 
computer to sleep the display after a certain amount of time which stops 
sending video.  Then I set the TV to automatically shut off after a 
certain amount of time with a loss of connection.  Now all I have to do 
it wiggle the mouse or press a key to wake the system up and press power 
on the TV when I want to start using it.

Brian Cluff
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