My Samsung LN-T3253H TV no longer displays video sent from my laptop's HDMI port at 1080p (1920×1080) resolution. It used to work, but sound didn't; now that sound through HDMI works, the 1920×1080 resolution doesn't. I tried this a few times
$ cvt 1920 1080
$ xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
$ xrandr --addmode HDMI-0 "1920x1080_60.00"
$ xrandr --output HDMI-0 --mode "1920x1080_60.00"
, but sometimes it tried changing my laptop's screen to 1080p, cropping it, not changing the HDMI TV's resolution. When it tries to change the TV, the TV just says "Not Supported Mode", when before 1920×1080 showed up as a resolution without my even having to add it manually with xrandr.
I really wonder why it worked before, especially since the TV's manual says the max resolution is 1360×768.
Also, I'm currently using KDE 4.9.4, but previously, when I got it to work, I think I was using KDE 4.8.
Perhaps it was scaling it before? Although 1280×720, the highest resolution the display system settings in KDE gives me, doesn't look nearly as sharp as 1920×1080 when 1920×1080 worked.
: I was able to get the extra resolution, 1360×768, by plugging into the 1st (not 3rd) HDMI port on the TV, so it certainly can display higher than 1280×720 resolution, and Phonon's audio still works, too, but running the above still made the TV display the "Not Supported Mode" error.