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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] Broken colours on usb-c/thunderbolt 3 to HDMI output (alt DP mode)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=107157">107157</a>
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<th>Summary</th>
<td>[SKL] Broken colours on usb-c/thunderbolt 3 to HDMI output (alt DP mode)
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>theswanted@gmail.com
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=140509" name="attach_140509" title="Toshiba TV screen with broken colors and wrong ratio">attachment 140509</a> <a href="attachment.cgi?id=140509&action=edit" title="Toshiba TV screen with broken colors and wrong ratio">[details]</a></span>
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]
<a href="https://www.dell.com/support/home/us/en/cabsdt1/product-support/servicetag/ck00562">https://www.dell.com/support/home/us/en/cabsdt1/product-support/servicetag/ck00562</a>
[2]
<a href="https://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_xps_laptop/xps-13-9350-laptop_reference%20guide_en-us.pdf">https://downloads.dell.com/manuals/all-products/esuprt_laptop/esuprt_xps_laptop/xps-13-9350-laptop_reference%20guide_en-us.pdf</a>
[3] <a href="https://en.wikipedia.org/wiki/Thunderbolt_(interface)#Thunderbolt_3">https://en.wikipedia.org/wiki/Thunderbolt_(interface)#Thunderbolt_3</a>
[4]
<a href="https://downloads.dell.com/FOLDER04795516M/1/Intel_TBT3_FW_UPDATE_NVM26_FJJK7_A08_4.26.11.001.exe">https://downloads.dell.com/FOLDER04795516M/1/Intel_TBT3_FW_UPDATE_NVM26_FJJK7_A08_4.26.11.001.exe</a></pre>
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