[Bug 94087] eDP panel exhibits sparse random noise and flickering (link issue), forcing DP DDI profile helps [Lenovo T450s]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94087

--- Comment #6 from Alexander Schremmer <alex at alexanderweb.de> ---
https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-bdw-vol11-display_0.pdf
says that the eDP table should ONLY be used for low_vswing. I.e. it is always
wrong to have the new voltage levels on the eDP links if the VBT did not allow
low vswings.

I do not see how the current code would differentiate between low and normal
vswings.

Hmm, but: intel_bios_reader does not have a notion of low vswing (yet). This
confused me.

By looking at the block 27, its obvious that the huge amount of zeros means
that low_vswing is enforced. This in turn means that i915 would be doing the
right thing according to the VBT: set low vswing.

-- 
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/20160211/e5090f33/attachment.html>