sddm greeter does not switch to graphics mode

[mv]

Hi,

after switching from slim to sddm, I have on one machine a strange problem:

The greeter of sddm does not switch into graphics mode. There is sometimes random (text) garbage shown on the VT where the greeter should appear, but nothing else happens.
When I configure sddm to directly start a session as a user, this session works, but after finishing - i.e. when the greeter should appear again - again the VT remains in text mode.
With slim there is no such problem. In a running X session, the sddm greeter also starts in test mode without any problems, i.e. the greeter itself seems to be fine.

The Xorg.0.log shows more or less the same output for slim or for the direct sddm session as for the non-working greeter: So everything seems to work, it just doesn't switch into graphics mode

The really strange thing is: This machine is almost identical (from soft- and hardware) to a machine where everything runs fine. Both have intel graphic cards (with somewhat different revisions).
I tried with intel as well as modesetting drivers, and the behaviour did not change.

Has anybody observed a similar phenomenon or has an idea what might be the cause?
I am hesitating to write a bug report to sddm, because I have no idea whether it is really sddm which is to blame...

Further information: I do not have installed anything with USE=wayland, i.e. all what I said presumably refers only to Xorg. Maybe something needs to be wayland for the sddm greeter? (But then again: Why is there no such problem on an almost identical machine which is also USE=-wayland?)

Edit: The versions I tried are sddm-0.15.0 and sddm-0.17.0; same result with both. Also upgrading qt from 5.7.1 to 5.9.3 did not change anything.

[Marlo]

Maybe that could help?

[mv]

Thanks for the reply. But sddm and root are already members of the group video. Actually, the /etc/{passwd,shadow,group,gshadow} files are identical on the two machines (where it works and doesn't, respectively).

What is also remarkable: Both machines have a 32bit chroot; when booting from this chroot, also there it works on the one machine and not on the other. I suspect that the different revision numbers of intel graphic cards are the fatal difference.

[Marlo]

Oh my god. When I see here how many support requests are made because of Intel graphics.
This must be a real pain for many users.
But I wish you much success mv.
Ma
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[mv]

[mv]

[depontius]

I'm having some sddm issues on an Intel machine also. The rest are AMD, and don't see the problem.

Here's one fun thing to test, though. My Intel machine simply comes up to a black screen after boot. However if I ssh in and "/etc/init.d/sddm restart", it comes back OK. So test to see if sddm shows correctly for you, after a restart. That at least tells if we both might be looking at the same problem.
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[mv]

[depontius]

Well yesterday, rebooting my laptop after the Big Profile 17 rebuild, the sddm greeter showed up first time.
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.sigs waste space and bandwidth

[mv]