[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 #28 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
(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?

> [ 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.

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