[Bug 92878] Black screen after backlight is off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92878

--- Comment #2 from Jani Nikula <jani.nikula at intel.com> ---
AFAICT this has nothing to do with backlight.

>From the logs:

[    0.900606] [drm:intel_dp_get_dpcd] DPCD: 12 14 84 41 00 00 01 01 02 00 00
00 00 0b 00

[    0.900903] [drm:intel_dp_get_dpcd] Display Port TPS3 support: source yes,
sink no
[    0.901190] [drm:intel_dp_print_rates] source rates: 162000, 270000, 540000
[    0.901192] [drm:intel_dp_print_rates] sink rates: 162000, 270000, 540000
[    0.901194] [drm:intel_dp_print_rates] common rates: 162000, 270000, 540000

[  244.397787] [drm:intel_dp_start_link_train [i915]] *ERROR* 5.4 Gbps link
rate without HBR2/TPS3 support

The display reports it has DPCD rev 1.2, and supports max link rate of 5.4 Gbps
per lane i.e. HBR2. However, it reports it does not support TPS3, even though
that support is mandatory for downstream devices that support HBR2.

*sigh*

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