[Bug 91434] [HSW] 23.976Hz & 24Hz modes broken on dual-display with recent (4.0.x) kernels

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91434

--- Comment #12 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Martin Andersen from comment #10)
> Added two attachments, the first from a correctly-working 3.13.5 and the
> second with a 4.0.9 kernel exhibiting the bug.
> 
> Steps performed after boot:
> 
> 3.15.5:
> 
> $ xrandr -q
> $ xrandr --output HDMI2 --rate 24       (HDMI2 switches refreshrate
> correctly)
> $ xrandr --output HDMI2 --rate 23.976   (HDMI2 switches refreshrate
> correctly)
> 
> 
> 4.0.9:
> 
> $ xrandr -q
> $ xrandr --output HDMI2 --rate 24       (blank screen on HDMI2)
> $ xrandr --output HDMI2 --rate 23.976   (blank screen on HDMI2)
> $ xrandr --output HDMI2 --rate 60       (display being output on HDMI2)
> 
> <logout from main DE to non-compositing WM>
> 
> $ xrandr --output HDMI2 --rate 24       (blank screen on HDMI2)
> $ xrandr --output HDMI2 --rate 23.976   (blank screen on HDMI2)
> $ xrandr --output HDMI2 --rate 60       (display being output on HDMI2)

Did you grab the logs after performing these steps? I'm not seeing any of these
modesets in either log.

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