[Bug 97363] [drm:ironlake_crtc_compute_clock [i915]] *ERROR* Couldn't find PLL settings for mode!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97363

--- Comment #3 from Robin Müller <rm1990 at gmx.de> ---
After some further investigations I figured out the following:
* only the LVDS port is affected by this bug, if I attach a monitor via HDMI
wayland starts and shows a picture on this monitor but the display of the
laptop gets black at the same time
* the wrong value of the crtc_state->port_clock comes from the clock value of
the drm_display_mode struct so it seems the wrong frequency is set very early
during the initialization of the drm stuff. Unfortunately I still haven't found
the place where this happens cause I'm not that familiar with the code of the
kernel to know by which part and when the drm initialization gets started. So I
mostly did this by trail and error.

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