[Bug 106182] [Intel NUC] HDMI1 sometimes stops working after resuming from s3 (a single monitor setup)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106182

--- Comment #20 from Imre Deak <imre.deak at intel.com> ---
Looks like the HDMI retimer chip is in a weird state when the problem happens.
To test that theory could you see if the following brings back the output on
the HDMI-A-1 connector from the bad state? It resets the chip and forces a
detect cycle. It needs the ioport Ubuntu package and you need to run it as
root:

v=$(outb 0x66 0x80; outb 0x62 0x1a; inb 0x62)
outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $(( v | 8 ))
sleep 0.1
outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $(( v & ~8 ))

echo detect > /sys/class/drm/card0-HDMI-A-1/status

Please provide a dmesg log after running the above in any case.

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