[Bug 105887] [GLK] no signal after switch resolution from 1080p at 23.98

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105887

--- Comment #72 from shashank.sharma at intel.com <shashank.sharma at intel.com> ---
(In reply to Clinton Taylor from comment #68)
> After bashing my head against he wall for several days I have finally
> determined that the issue is caused by the HDMI level shifter on the board
> and not a driver issue. 
> 
> After changing the mode from 1080p24 to 1080p50 the scope shows a valid
> clock into the level shifter and a very low amplitude clock on the output to
> the connector. Adding a short delay after the Transcoder is disabled appears
> to solve the issue with the level shifter.
> 
> I have attached a scope shot of the waveform into the level shifter (yellow
> trace) and the output to the connector (blue trace).

Hello Clinton,
What kind of level shifter is this ? Is it DP -> HDMI passive LS or something
else ? Do you have any information about it ? 

- Shashank

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20180528/5c33bc01/attachment.html>