I'm not sure why the mode would be limited to 60Hz but you should know
that Xorg's multi-monitor support is very limited. It can only update
all monitors at the same time at the same rate. So if you have a 60Hz
monitor connected then it's possible Xorg will limit all monitors to
60Hz.

Even if all your monitors are the same refresh rate, Xorg is still a
menace because it tries to update all of them at the same time even if
their clocks aren't in sync. This means you might see tearing.

Wayland solves all of the above.

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https://bugs.launchpad.net/bugs/1968040

Title:
  [i915] Blanked screen doesn't wake up after locking
  [drmModeAtomicCommit: Argument invalide] [drmModeAtomicCommit: Invalid
  argument]

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