> Could you try doing a dnf distro-sync as root from runlevel 3, just
> to be sure no cruft was left around from the upgrade to F27.

Yes I could, but there was 900-1000 MB data for full upgrade! I did
remove some packages which I don't use them like "libreoffice**",
"qt**", 'cheese', gnome-boxes, totem, rhythmbox and even firefox, this
reduced size of upgrade to 500-600 MB, but because there is no guaranty
after download all of them my problem be solved, I didn't upgrade.

Instead of upgrade, I did install LightDM, then stop-disable
gdm.service and enable lightdm.service, then I did boot Fedora without
"nomodeset" kernel parameter and the result was LightDM ran on the
highest resolution supported by the monitor, 1920x1080, but like the
past, none of the available sessions can't start, I did reboot again
without "nomodeset" and log-in as normal user in one TTY then `startx'
the below log is for this:


> Could you show the kernel settings line?

you can see them in log files in the line begins with "Kernel command line"

"....  ro nomodeset rhgb quiet LANG=en_US.UTF-8"

> What is the resolution on the virtual console when you boot into runlevel 3?

the highest resolution supported by the monitor, 1920x1080

> If you type the command journalctl -b and look through the output, do
> you see any error when the kernel tries to load the radeon module?

yes, there was some lines in the red color when I boot Fedora with
"nomodeset" but there was no red colored lines when boot without
'nomodeset' and even run the command `startx' as root:

[drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!
[drm] VGACON disable radeon kernel modesetting.
[drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!

> What does the negotiation look like for video?

what should I do?
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