[Bug 88691] [BYT Regression]HDMI screen flashes when running "testdisplay -o 30,3"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88691

--- Comment #2 from Yi Sun <yi.sun at intel.com> ---
(In reply to Jiang Wang from comment #0)
> Created attachment 112644 [details]
> log
> 
> ==System Environment==
> --------------------------
> Regression: Yes. I tried _drm-intel-testing 2014_12_06 commit and
> testdisplay shows normal. 
> 
> Non-working platforms: BYT
> 
> ==kernel==
> --------------------------
> -testing: 2015_01_18 commit 6dd5bb25ce0ed3a0012b69d553d74e1a0d39c313(test
> fails)
> 
> 
> ==Bug detailed description==
> -----------------------------
> Connect to HDMI display, Boot BYT, login and run "testdisplay -o 30,3", HDMI
> screen flashes. 
> 
> The same issue happens on VGA, DP screen too.
> 
> ==Reproduce steps==
> ---------------------------- 
> 1. Connect to HDMI display, Boot BYT, login and run "testdisplay -o 30,3"
> 
> Bisect is on going.

Jiang, you can provide the display timing/resolution which you were using
And notice that any time you want to attach dmesg, be sure you have option
drm.debug=0xe !

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