On Sun, 03 Apr 2022 19:50:01 +0200, Felix Miata <mrma...@earthlink.net> wrote:
>Noah Sombrero composed on 2022-04-03 08:40 (UTC-0400): > >> Thanks. I did find suggestions like this online. But it appears that >> xorg.conf is no longer used, and is indeed missing from xorg.conf.d. >> So I can simply create a new file with these entries and put it in >> place? > >/etc/X11/xorg.con* are optional. They are available for use if and when >automagic >is not working. Before going through the manual configuration routine, let's >first >see what is actually happening. Please provide output from the following: > > cat /var/log/Xorg.0.log | pastebinit > >>>Section "Monitor" >>> Identifier "Monitor-HDMI1" >>> VendorName "LGD" >>> ModelName "ULTRAWIDE" >>> Modeline "2560x1080" 185.580 2560 2624 2688 2784 1080 1083 1093 1111 >>> -HSync -VSync >>> Option "PreferredMode" "2560x1080" >>>EndSection > >GTF and CVT can be used to generate a modeline, but their results will be no >better than the modeline X will generate automatically if given the proper >data to >substitute for EDID failure. > >>>Via xrandr instead, applying such a thing would look like this: > >>>xrandr --newmode "2560x1080" 185.580 2560 2624 2688 2784 1080 1083 1093 1111 >>>-HSync -VSync >>>xrandr --addmode HDMI1 "2560x1080" >>>xrandr --output HDMI1 --mode "2560x1080" > >>>So that's the how. The what is best explained by this web page: >>>https://arachnoid.com/modelines/ > >>>Which should be enough for you to work out the specific timings >>>needed to get this screen to work. > >Xorg is fully competent to generate needed modelines, given the right >information. >Normally that information comes from EDID. If EDID is broken, or not reaching >Xorg, substitute information can provided via /etc/X11/xorg.con*. > > hwinfo --monitor Bash says, hwinfo: command not found. >should generate lines similar to these: > > Vert. Sync Range: 24-75 Hz > Hor. Sync Range: 26-81 kHz > >These can be used in a config file, e.g. /etc/X11/xorg.conf.d/50-monitor.conf, >containing: > > Section "Monitor" > Identifier "DefaultMonitor" > VendorName "MyBrand" > ModelName "MyModel" > HorizSync 26-81 > VertRefresh 24-75 > Option "PreferredMode" "1920x1080" > EndSection > >This, appropriately adjusted to include the numbers for the specific display, >is >all the information Xorg usually needs to emulate the EDID information that >apparently doesn't get processed correctly for whatever reason. Others may >suggest >a modeline is needed, but independent modeline generators rarely do any better >calculating than Xorg does automatically, if & when given the needed data as >above >suggested. I've been using HorizSync and VertRefresh with difficult >environments >for well over a decade, and never have needed a pre-configured modeline. When >configured with HorizSync and VertRefresh, instead of with a modeline, very >likely >plugging in a different display at some future time won't result in unusable >output that inhibits removing or editing the .conf file containing the >modeline. -- Noah Sombrero
