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I have a screen display issue since Ubuntu 16.04 and continuing in a fresh 18.4 LTS install. It is on one of our HTPCs running on an AMD A12 processor & 42" JVC LCD screen. The JVC is 3 years old. It is identified by the OS as 'DTV 32'.
I have placed a short video clip here to show what happens:
Take a look at /var/log/Xorg.0.log's EDID Modeline entries. Do you see any there that say ...1080"x50.0 or ...1080i"x50.0? I'm not in AU, but nevertheless I expect you will not. The standard you are referring to is for telecasting, not for computer screens. You should be preferring a mode during conventional PC use that conforms to your LCD's preferences, and leave it to the video player and tuner apps to use @50Hz however and whenever they deem appropriate.
Take a look at /var/log/Xorg.0.log's EDID Modeline entries. Do you see any there that say ...1080"x50.0 or ...1080i"x50.0? I'm not in AU, but nevertheless I expect you will not. The standard you are referring to is for telecasting, not for computer screens. You should be preferring a mode during conventional PC use that conforms to your LCD's preferences, and leave it to the video player and tuner apps to use @50Hz however and whenever they deem appropriate.
Code:
[ 18.067] (II) RADEON(0): Output HDMI-0 connected
[ 18.067] (II) RADEON(0): Output HDMI-1 disconnected
[ 18.067] (II) RADEON(0): Using exact sizes for initial modes
[ 18.067] (II) RADEON(0): Output HDMI-0 using initial mode 1920x1080i +0+0
[ 18.067] (II) RADEON(0): mem size init: gart size :3fdcc000 vram size: s:40000000 visible:f43d000
[ 18.067] (==) RADEON(0): DPI set to (96, 96)
[ 18.067] (==) RADEON(0): Using gamma correction (1.0, 1.0, 1.0)
The issue of the messed up screen is only partially resolved, as it persist during boot after the grub menu and during the splash screen. When xfce4 activates the display settings force 1920x1080 @ 50Hz.
Which brings me back to the original question; to configure/ control the display during the boot sequence or splash screen?
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