[Bug 94825] LVDS blank screen on GM45

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94825

--- Comment #25 from Rob Kramer <rob at solution-space.com> ---
Ah, I just noticed there is still this issue:

  [drm:intel_enable_lvds [i915]] *ERROR* timed out waiting for panel to power
on

This occurs every time I restart X, which perhaps does a mode switch to the
same mode? The panel seems to work fine though.. 

When there is a mode switch (or X is started), a relay clicks in this display
setup. I'm not sure why or what that's for, or if that could introduce an
external delay that the driver doesn't expect.

    if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
        DRM_ERROR("timed out waiting for panel to power on\n");

Is there a way to see if the panel is detected as switched on after a longer
period of time (some seconds)? In /sys, debugfs, or with intel-gpu-tools?

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