[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 #29 from Imre Deak <imre.deak at intel.com> ---
(In reply to Imre Deak from comment #27)
> (In reply to Robert Liu from comment #26)
> > Created attachment 139458 [details]
> > dmesg for outb and inb commands #2
> > 
> > Well, the screen now is off. However, I cannot recover it by poweroff.
> > A removal of the adapter is required to make the screen back.
> > 
> > It looks to me the behavior is slightly different from the issue has.
> 
> Yes, the sequence you tried just keeps the chip in reset you also need to
> remove the reset condition to re-enable the display. If the following blanks
> and unblanks the display for you when it's enabled properly, could you try
> it again from the stuck state?
>
> v=$(outb 0x66 0x80; outb 0x62 0x1a; inb 0x62)
> echo $v
> outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $(( v | 9 ))
> outb 0x66 0x80; outb 0x62 0x1a; inb 0x62
> 
> sleep 0.1
>
> outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $(( v & ))


> outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $(( v | 1 ))


> outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $v

Err, sorry made a mistake the sequence correctly:

v=$(outb 0x66 0x80; outb 0x62 0x1a; inb 0x62)
echo $v
outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $(( v | 9 ))
outb 0x66 0x80; outb 0x62 0x1a; inb 0x62

sleep 0.1

outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $(( v | 1 ))
outb 0x66 0x81; outb 0x62 0x1a; outb 0x62 $v

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