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Re: Startx works, but sddm/lightdm/xdm doesn't

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On Mon, Feb 28, 2022, 3:43 PM John Goerzen <jgoerzen@complete.org> wrote:

> Hi,
>
> I have a system with a GeForce 1050 Ti on bullseye.
>
> On this system, if I log in as a regular user and run startx, everything
> works fine; KDE Plasma comes up and it's all good.
>
> But sddm doesn't work.  In fact, when it starts, it causes my monitor to
> go "no signal".  Oddly, though, if I can log in blindly, then once I hit
> enter after putting in my password, KDE will come up and work like it
> should.
>
> I also tried lightdm and xdm.  Both of them also had "no signal" when
> starting.
>
> It is using the nouveau driver.  There are no errors in Xorg.0.log,
> journalctl, dmesg, syslog, or the xsession log.  lspci doesn't show any
> other graphics adapter.  xrandr on the sddm session shows it detected
> the appropriate output at the appropriate resolution.  Xorg.0.log looks
> completely appropriate; detecting devices, setting them up, etc.
>
> If I boot the same drive on a different box with Intel graphics, sddm
> works fine.
>
> This is a fresh bullseye install.
>
> A am utterly baffled; I'd think at least xdm should work!
>

I had something similar happen with Debian 8 a long time ago. It turned out
to be because the driver/firmware/grafx-chipset had the wrong idea about
the monitor's available resolutions and modes. It was using too high a
resolution.

Thanks,
>
> John
>
>

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Thread

Startx works, but sddm/lightdm/xdm doesn't John Goerzen <jgoerzen@complete.org> - 2022-02-28 22:50 +0100
  Re: Startx works, but sddm/lightdm/xdm doesn't Felix Miata <mrmazda@earthlink.net> - 2022-03-01 01:00 +0100
    Re: Startx works, but sddm/lightdm/xdm doesn't John Goerzen <jgoerzen@complete.org> - 2022-03-01 05:20 +0100
      Re: Startx works, but sddm/lightdm/xdm doesn't Felix Miata <mrmazda@earthlink.net> - 2022-03-01 05:50 +0100
        Re: Startx works, but sddm/lightdm/xdm doesn't John Goerzen <jgoerzen@complete.org> - 2022-03-01 06:30 +0100
  Re: Startx works, but sddm/lightdm/xdm doesn't Nicholas Geovanis <nickgeovanis@gmail.com> - 2022-03-01 02:00 +0100
  Re: Startx works, but sddm/lightdm/xdm doesn't Anssi Saari <as@sci.fi> - 2022-03-01 14:50 +0100

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