[Bug 105655] New: GeminiLake HDMI hotplug between 4K at 60 and 4K at 30 monitors
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Wed Mar 21 10:41:41 UTC 2018
https://bugs.freedesktop.org/show_bug.cgi?id=105655
Bug ID: 105655
Summary: GeminiLake HDMI hotplug between 4K at 60 and 4K at 30
monitors
Product: DRI
Version: DRI git
Hardware: x86-64 (AMD64)
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: antonychen at qnap.com
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Environment:
Mainboard: Intel RVB
BIOS: AMI
OS: Ubuntu 17.10
Monitors: ViewSonic VP2780-4K (A), ASUS PB287Q (B)
TV: LG 49UJ630T (C)
A and C support 4K at 60, B support 4K at 30
My steps:
1. Plug A or C and bootup
2. After OS finishes booting, unplug HDMI cable in console mode
Then dmesg shows the error messages:
[drm:drm_scdc_set_high_tmds_clock_ratio [drm_kms_helper]] *ERROR* Failed to
read TMDS config: -6
[drm:intel_hdmi_handle_sink_scrambling [i915]] *ERROR* Set TMDS ratio failed
3. Plug B
Then there is not signal to B, and dmesg shows the error messages above again.
4. Unplug B and Plug A or C, then A or C display normally.
I also do some tests when I start X:
1. Plug A and bootup
2. sudo xinit
3. unplug HDMI cable and plug B, there is not signal to B
4. xrandr --output HDMI1 --off
Then dmesg shows the error messages:
[drm:drm_scdc_set_high_tmds_clock_ratio [drm_kms_helper]] *ERROR* Failed to
read TMDS config: -6
[drm:intel_hdmi_handle_sink_scrambling [i915]] *ERROR* Set TMDS ratio failed
5. xrandr --output HDMI1 --auto
Then there is not signal to B, and dmesg shows the error messages above again.
In the second testing, if I use C to replace A, then there IS signal to B in
the 5th step.
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