Re: Untangling the mess that gui startup has become
Hi Phillip, If "the gnome-shell greeter does not appear to give you any choice in what login session you get" then that means the 'eglnative' back-end (Wayland) crashed on start-up so the Wayland login option gets silently removed. If you wrote that 3 weeks ago and are using 18.10 then I think it may have been this bug: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1786883 So just update your system and that will be fixed. If it's not fixed and you still don't get any Wayland login option from gdm3 then please log a bug about that by running: ubuntu-bug gdm3 - Daniel On 12/09/18 03:33, Phillip Susi wrote: Resending this after subscribing since after waiting for 3 weeks, no moderator has released it. Things used to be fairly simple. You ran startx, and it followed ~/.xinitrc which directed it to pick a display number and run XFree86 on that display number, configure it to use an XAUTHORITY file, set the environment variables to point to that display and XAUTHORITY file, then run your window manager and shell ( which were actually separate things ). Fast forward 25 years and now it looks like you have a display manager ( gdm3 or lightdm ). It looks like gdm3 looks in /etc/gdm3/custom.conf, where you can tweak things but by default, it doesn't say much and gdm3 defaults to running gdm-x-session, which has no man page. It looks like it is a clone of gnome-session ( why not just use gnome-session? ) It apparently sets up XAUTHORITY and runs Xorg and tells it which display and XAUTHORITY file to use. At this point under lightdm I think there were some config files that direct it to run unity-greeter to prompt you to login, but it looks like gnome-shell is being run on vt1 and it must have a built in greeter function, in addition to being a shell and window manager. After logging in, gdm3 appears to fork gdm-session-worker ( no man page ) on the next unused vt. It runs gnome-session-binary ( whose man page appears to be just gnome-session ). It is directed to set up a specific type of session chosen at the greeter or defaulted, and how to setup these sessions is defined in files in /usr/share/gnome-session/sessions. These files seem to list a bunch of DBUS names so unlike other kinds of session files used by other display managers that just tell them what programs to launch, gnome-session must somehow punt to DBUS to launch them. Though oddly, it appears that gnome-shell is forked from gdm-session-worker rather than the dbus daemon. That is then both your window manager and shell. Now for some reason, the gnome-shell greeter does not appear to give you any choice in what login session you get ( why? ), but lightdm does, so there you can choose to log in using a wayland session, and it goes through an entirely different set of config files that end up directing it to just run gnome-shell, which now besides being a shell and window manager, is also a wayland compositor, replacing Xorg. gnome-shell appears to automatically fork Xwayland, and forgets to setup an XAUTHORITY for it. A few months ago gdm did give you a choice to log in with wayland and iirc from running it and looking at its code, it decided to run gnome-shell and Xwayland. I guess gnome-shell notices if Xwayland was already running and wouldn't fork one itself if so. Do I have that about right and can anyone fill in the missing pieces? -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
Re: Untangling the mess that gui startup has become
On Tue, Sep 11, 2018 at 3:33 PM Phillip Susi wrote: > Resending this after subscribing since after waiting for 3 weeks, no > moderator has released it. I am not a moderator on this list, but this list hasn't really been used for months. We use https://community.ubuntu.com/c/desktop instead and we might even close this list. > gnome-shell appears to automatically fork Xwayland, and forgets to > setup an XAUTHORITY for it. I am going to guess that this quote is the key point you are interested in. There is an interesting patch mentioned in the description of https://launchpad.net/bugs/1652282 that I don't think the team has directly discussed yet. But let's move the discussion to the Ubuntu Community Hub instead. Thanks, Jeremy Bicha -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
Untangling the mess that gui startup has become
Resending this after subscribing since after waiting for 3 weeks, no moderator has released it. Things used to be fairly simple. You ran startx, and it followed ~/.xinitrc which directed it to pick a display number and run XFree86 on that display number, configure it to use an XAUTHORITY file, set the environment variables to point to that display and XAUTHORITY file, then run your window manager and shell ( which were actually separate things ). Fast forward 25 years and now it looks like you have a display manager ( gdm3 or lightdm ). It looks like gdm3 looks in /etc/gdm3/custom.conf, where you can tweak things but by default, it doesn't say much and gdm3 defaults to running gdm-x-session, which has no man page. It looks like it is a clone of gnome-session ( why not just use gnome-session? ) It apparently sets up XAUTHORITY and runs Xorg and tells it which display and XAUTHORITY file to use. At this point under lightdm I think there were some config files that direct it to run unity-greeter to prompt you to login, but it looks like gnome-shell is being run on vt1 and it must have a built in greeter function, in addition to being a shell and window manager. After logging in, gdm3 appears to fork gdm-session-worker ( no man page ) on the next unused vt. It runs gnome-session-binary ( whose man page appears to be just gnome-session ). It is directed to set up a specific type of session chosen at the greeter or defaulted, and how to setup these sessions is defined in files in /usr/share/gnome-session/sessions. These files seem to list a bunch of DBUS names so unlike other kinds of session files used by other display managers that just tell them what programs to launch, gnome-session must somehow punt to DBUS to launch them. Though oddly, it appears that gnome-shell is forked from gdm-session-worker rather than the dbus daemon. That is then both your window manager and shell. Now for some reason, the gnome-shell greeter does not appear to give you any choice in what login session you get ( why? ), but lightdm does, so there you can choose to log in using a wayland session, and it goes through an entirely different set of config files that end up directing it to just run gnome-shell, which now besides being a shell and window manager, is also a wayland compositor, replacing Xorg. gnome-shell appears to automatically fork Xwayland, and forgets to setup an XAUTHORITY for it. A few months ago gdm did give you a choice to log in with wayland and iirc from running it and looking at its code, it decided to run gnome-shell and Xwayland. I guess gnome-shell notices if Xwayland was already running and wouldn't fork one itself if so. Do I have that about right and can anyone fill in the missing pieces? signature.asc Description: OpenPGP digital signature -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Merge] ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master
The proposal to merge ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master has been updated. Description changed to: I had to revert changes to always show the save dialog in Ubuntu because that behaviour would conflict with the one specified in the "shortcuts" page in Gnome Control Center where it is explicitly mentioned that the shorcuts saves the screenshot in Pictures directly. For more details, see: https://code.launchpad.net/~azzar1/ubuntu/+source/gnome-screenshot/+git/gnome-screenshot/+merge/354557 -- Your team Ubuntu Desktop is requested to review the proposed merge of ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master. -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Merge] ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master
The proposal to merge ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master has been updated. Commit message changed to: Merge with debian. For more details, see: https://code.launchpad.net/~azzar1/ubuntu/+source/gnome-screenshot/+git/gnome-screenshot/+merge/354557 -- Your team Ubuntu Desktop is requested to review the proposed merge of ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master. -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
Re: [Merge] ~3v1n0/ubuntu/+source/gnome-calculator:ubuntu/bionic into ~ubuntu-desktop/ubuntu/+source/gnome-calculator:ubuntu/bionic
Do we really want to merge with Debian for a SRU? This sounds like against the "minimal set of changes" that a SRU should have and may be rejected by the SRU team. Otherwise, +1 on the changes themselves for me, but before acking, please check with the SRU team. -- https://code.launchpad.net/~3v1n0/ubuntu/+source/gnome-calculator/+git/gnome-calculator/+merge/354330 Your team Ubuntu Desktop is requested to review the proposed merge of ~3v1n0/ubuntu/+source/gnome-calculator:ubuntu/bionic into ~ubuntu-desktop/ubuntu/+source/gnome-calculator:ubuntu/bionic. -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
[Merge] ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master
The proposal to merge ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master has been updated. Status: Needs review => Work in progress For more details, see: https://code.launchpad.net/~azzar1/ubuntu/+source/gnome-screenshot/+git/gnome-screenshot/+merge/354557 -- Your team Ubuntu Desktop is requested to review the proposed merge of ~azzar1/ubuntu/+source/gnome-screenshot:ubuntu/master into ~ubuntu-desktop/ubuntu/+source/gnome-screenshot:ubuntu/master. -- ubuntu-desktop mailing list ubuntu-desktop@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-desktop
