[Bug 95741] Broadwell graphics on Dell XPS13 (early 2015) loses horizontal sync on shift to tty console

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=95741

--- Comment #5 from W Unruh <unruh at physics.ubc.ca> ---
Created attachment 172981
  --> https://bugzilla.kernel.org/attachment.cgi?id=172981&action=edit
dmesg with drm.debug=14

Here is the dmesg output with the Kernel 4.0 rc6 (with the _REV=2 and the Alsa
patch for hda headset output). I booted up with the drm.debug=14 on the command
line, logged in using the kdm to X, and then once doing alt-ctrl-F2 to go to
the tty (with lost hor sync) back to X with Alt-ctrl-F1 then to alt-ctrl-F5
again lost sync, and back to X.
As mentioned This works properly on 3.19.2 (no lost sync) but fails on 4.0 rc 4
5 and 6 with indications that it also fails (loses sync) on rc2, but I have not
personally tested that.

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