On Mon, Jan 25, 2016 at 08:38:00PM -0500, Giles Orr wrote: > I have an old laptop (an Acer Travelmate 270 to be exact) that has no > screen. The screen busted years ago, and I simply removed it. This > wasn't a big problem until a couple days ago: I'd hook it up to an > external screen via the VGA out, and everything was fine. But a > couple days ago, I upgraded from Debian wheezy to Debian jessie, and > after the upgrade the external monitor now claims the provided signal > is "Out of Range." This doesn't appear to be the same as "No signal" > because after several minutes it switches off (about when the screen > blanking would kick in) and pressing a keyboard button brings back the > "Out of Range" signal. I can ssh into the machine, so there's an > option to fix it. I could potentially install Ubuntu or re-install > wheezy, but I'd prefer to fix this if possible. How do I tell X to > detect and use the monitor over the external VGA connector - and only > that connector, ignoring the now-missing internal screen candidate? > And failing that, how can I force 1024x768 (which is what was working > fine with wheezy) with mirroring across both outputs? > > Thanks. > > P.S. I was clever enough to try ssh with X-forwarding and then running > arandr and eventually xrandr, but they work with the X server they can > talk to ... which is your local machine, not the remote you've sshed > into. Even had that worked, I wouldn't know what settings to put into > what file: it was bad enough back in the days of editing > /etc/X11/Xorg.conf by hand, but it's now been replaced by a twisty > maze of start-up scripts that are supposed to detect everything for > you that mostly work but which have remained stubbornly opaque to me > when they fail ...
Pointing the environment XAUTHORITY and DISPLAY at the local machine should allow you to run xrandr remotely. DISPLAY=:0.0 and XAUTHORITY=~/.Xauthority or maybe something in /tmp depending on the displaymanager tends to work. -- Len Sorensen --- Talk Mailing List [email protected] https://gtalug.org/mailman/listinfo/talk
