This sounds like two separate issues:
1. Needing to wake the TV with the remote. I would hazard a guess that's
a feature/bug of the TV firmware. TVs generally don't expect to be used
as monitors and may not implement power mode switching reliably like a
proper monitor. Most likely it's designed to respond to the remote only.
I don't think this is a software bug in Ubuntu, but probably in the TV
itself...
2. Windows get moved and resized. This should only happen if the monitor
(TV) is seen to be unplugged. But indeed sometimes power saving modes do
get confused for the monitor being unplugged. I wonder though if this is
also a problem with the TV failing to sleep correctly and instead
disconnecting from the computer... Can you test a (non-TV) monitor on
the same HDMI port?
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Summary changed:
- HDMI connected monitor wakeup problems
+ HDMI connected TV wakeup problems
** Summary changed:
- HDMI connected TV wakeup problems
+ [amdgpu] HDMI connected TV wakeup problems
** Package changed: xorg-server (Ubuntu) => xserver-xorg-video-amdgpu
(Ubuntu)
** Tags added: amdgpu
** Tags added: multimonitor
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https://bugs.launchpad.net/bugs/1892427
Title:
[amdgpu] HDMI connected TV wakeup problems
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