[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 #30 from shashank.sharma at intel.com <shashank.sharma at intel.com> ---
(In reply to Ander Conselvan de Oliveira from comment #28)
> (In reply to shashank.sharma at intel.com from comment #26)
> > 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
> 
> Hmm, what happens in this *ERROR* case?
> 
Don't worry about it, I was using DRM_ERROR(Shashank:) for my logs, there is no
error here :)
> > [ 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)
> 
> This really shouldn't depend on user space, except for choosing the mode.
> Can you post a full dmesg log for both modesets. Maybe there is some slight
> difference between the modes that we're missing.

I also thought so, but this lib names intel-drv.so, which seems specific to our
HW, so there could be a relation. I will share the full logs tomorrow, as I
don't have access to the board today. 

Meanwhile, can you please give it a try, by just replacing your intel_drv.so
with attached one, and try this modeset ? This will help us to focus on right
path.

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