I have a monitor that confuses the graphics drivers. When Debian (12 or 13) starts, the display is shifted about three inches to the right — both in text mode while things are starting, and later when either sddm or gdm3 runs. One can choose whether to use gnome or KDE as a window manager by using the little gear icon at the bottom right corner, after choosing the user and before submitting the password. But … with the display shifted, the little gear icon isn't on the screen, so I can't select one (I have Gnome and KDE installed).
I tried putting video=1680x1050 on the "linux" line in grub.cfg but that had no effect. 1. Can I specify the video mode that sddm or gdm3 uses? 2. Can I select the window manager other than by way of the little (invisible) gear icon? The problem happens with two different computers, both running Debian 12 (and then 13), using either NVidia drivers (for K2200 or FX 1300) or nouveau drivers. And a new problem is that after reinstalling Debian 13 on one of the computers, I can't get past the login screen, either using sddm or gdm3. gdm3 doesn't even offer to accept the password. sddm accepts it, blanks the screen as though it's about to launch the window manager, then goes back to the login screen. Any ideas how to get around this? Or should I just give up and reinstall Debian 13 (again)?
