[Bug 107157] New: [SKL] Broken colours on usb-c/thunderbolt 3 to HDMI output (alt DP mode)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107157

            Bug ID: 107157
           Summary: [SKL] Broken colours on usb-c/thunderbolt 3 to HDMI
                    output (alt DP mode)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: theswanted at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140509
  --> https://bugs.freedesktop.org/attachment.cgi?id=140509&action=edit
Toshiba TV screen with broken colors and wrong ratio

[SKL] Broken colours on usb-c/thunderbolt 3 to HDMI output (alt DP mode)

• Related to: #99137
• Description: Colours on external TV screen connected through
USB-C/Thunderbolt 3 to HDMI adapter are broken — "16 bits depth" kind (see
attachment) — and aspect ratio is 4/3.
• Setup: 
        - Hardware: DELL XPS 9350 with Intel Graphics 520 with BIOS V1.7.0,
service tag CK00562 [1].
        - USB-C/Thunderbolt Controller: Reference is hard to find, but the
technical prospect mentions support for Display Port 1.2 only.
          So my guess is it's intel late 2015 L6540 controller (Alpine Ridge)
[2][3].
          Tested firmware are original and latest from 05 Apr 2018 [4].
        - USB-C/Thunderbolt to HDMI Adapter: Aukey CB-C37.
        - External screen: TOSHIBA TV 43L420U.
        - HDMI cable: I have tried many.
        - Distro: Manjaro 17.1.11.
        - Kernels tested: 4.18rc2, 4.17.4-1, 4.16.18-1, 4.14.53-1, 4.10.0-28,
4.9.111-1, 4.4.139-1 
• Extra diagnostic: Colors are not broken on PC Monitors (22 to 28 inches) nor
on Windows 10 with the same TOSHIBA TV.
        HDMI audio is non-selectable in KDE settings, but I could make it work
with `pacmd set-card-profile'. However, it did not improve color-rendering.
        I tried to switch on/off the TV screen as OP in #99137 offered and
change resolutions, with no success.
• Attachments:
        - picture of the broken colors screen (with current post)
        - dmesg log with drm.debug=0xf (bellow this post)
        - xrandr verbose query (bellow this post)

[1]
https://www.dell.com/support/home/us/en/cabsdt1/product-support/servicetag/ck00562
[2]
https://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_xps_laptop/xps-13-9350-laptop_reference%20guide_en-us.pdf
[3] https://en.wikipedia.org/wiki/Thunderbolt_(interface)#Thunderbolt_3
[4]
https://downloads.dell.com/FOLDER04795516M/1/Intel_TBT3_FW_UPDATE_NVM26_FJJK7_A08_4.26.11.001.exe

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