[Bug 102820] [bisected][DC] commit ebbf7337e2daacacef3e01114e6be68a2a4f11b4 prevents X11 from starting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102820

--- Comment #15 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
(In reply to Harry Wentland from comment #10)
> As for the behavior you're seeing with the modelines removed, I don't fully
> understand what you're seeing. Mind posting a picture? It sounds like we
> should be driving the monitor in 4k30 at that point but seems like something
> goes wrong there, from your description.

The display is driven in 3840x2160 @ 30Hz with modelines removed and commit
present - but the picture fills only ~80% in the middle of the screen
horizontally (100% vertically).  

If I use "xrandr --output HDMI-A-0 --mode 3840x2160 --rate 24" to switch to
24Hz, then the picture fills the whole screen.

Without the commit (still without Modelines), when I use "xrandr --output
HDMI-A-0 --mode 3840x2160 --rate 30" to voluntarily only use 30Hz, then the
picture fills the whole screen. So with and without the commit, different
parameters seem to be used to output 3840x2160 @ 30Hz.

(If really required, I can shoot a photo later, but it doesn't really show
anything remarkable except for the two black bars to the left and the right of
the screen.)

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