[Bug 94825] LVDS blank screen on GM45

[bugzilla-daemon at freedesktop.org]

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

--- Comment #26 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Rob Kramer from comment #25)
> 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?

Please open a new bug for that, and attach the dmesg, opregion, and 'intel_reg
dump' there. Make sure you grab intel-gpu-tools fresh from git since we had a
bug there which make 'intel_reg dump' fail on gen4. I pushed the fix for that a
few days ago.

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the assignee for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160412/0d01fabc/attachment.html>