[Bug 100440] [GLK] [IGT] testdisplay -a shows corruption on HDMI 4k display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100440

--- Comment #26 from shashank.sharma at intel.com <shashank.sharma at intel.com> ---
I was able to get a proper modeset on the said mode (25x16) on same monitor,
using both Mint GUI as well as testdisplay.
There are 3 files attached with this message:
- Modeset 25x14 using Mint-GUI: Modeset 25x14 with GUI
- Modeset 25x14 using testdisplay: Modeset 25x14 with testdisplay

The command used in testdisplay was:
./testdisplay -f 241.5,2560,2608,2640,2720,1440,1443,1448,1481 

I also confirmed that:
- It was 12 BPC modeset
- The scrambling and high tmds clock was enabled during this modeset.
[ 1145.592443] [drm:intel_hdmi_compute_config] Shashank: picking bpc to 12 for
HDMI output
[ 1145.593176] [drm:intel_hdmi_handle_sink_scrambling] Shashank: Setting sink
scrambling=0 tmds=0 for enc:DDI C connector:HDMI-A-2
[ 1145.924969] [drm:intel_ddi_enable_transcoder_func] *ERROR* Shashank: Set
source scrambling
[ 1145.934277] [drm:intel_hdmi_handle_sink_scrambling] Shashank: Setting sink
scrambling=1 tmds=1 for enc:DDI C connector:HDMI-A-2

The only difference is, I was using an old intel_drv.so library. This lib comes
with X package I guess, as its location is
(/usr/lib/xorg/modules/drivers/intel_drv.so)

With the latest version of this libraray, I was not even getting the desktop on
Mint-GUI, there was a crash during X modeset. I attached X with GDB, and saw
the crash in this library. Then I used older version of this library, and with
this I am not getting any crash. 

Library is also attached for further reference.

- Shashank

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