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On Mon 01 Jun 2015 16:26:17 Frederic Muller wrote: > Hi! > > I connect one of my machines to my TVs. I have noticed that since > sometimes along F21 updates the specific TV resolution could not longer > be activated. As it is definitely not a life threatening condition I > thought another update would fix it. Apparently the problem might lay > elsewhere... > > So I have 2 TVs (with different resolution) to test. I start with cvt, > then xrandr --newmode, xrandr --addmode and then --output.
You should be getting EDID back from the screen that can be used to set the mode.
You should see the EDID with xrandr --verbose.
It is worth looking at the dmesg output to see it the kernel had a problem with the connection.
There is a patch in kernel 4.1 that can help with EDID read problems that might be what you are seeing. (Spec says 1 bytes read are good, but vendors sometimes only work with 16 bytes read as that is what Windows does).
Barry
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