Re: on-screen artifacts (red pixels) at high resolution with Intel HD 630 (Kaby Lake)
>> Two other PCs (Linux and Windows) going through the same HDMI cable to
>> the same TV and same TV port using the same 1920x1080 resolution work
>> perfectly.
>
> How long is the cable? Do you have access to another to try? ~20% of the HDMI
> cables I have are either useless or flaky with at least one device.
Same symptoms with another cable.
> Does the TV label any of its HDMI ports differently from the others? One of mine
> does, labeling one HDMI-3/DVI. It does behave differently than the others.
Same symptoms with the other TV ports, some being worse than others.
>> Outputting to another 1920x1080 monitor works well.
>
> Do you have another, to which you could connect using DisplayPort or HDMI?
Yes, another screen is working perfectly through the same HDMI cable.
>> I've tried multiple combinations of Xorg setup with no working setup :
>> - modesetting Xorg driver with glamor or none as AccelMethod
>> - intel Xorg driver with sna or uxa as AccelMethod, DRI 2 or 3.
>> I've also tried with i915.enable_rc6=0 and this does not change anything.
>
> The log you previously attached reports "Indeterminate output size" from the
> Samsung 659's EDID. I wonder if it would change anything to include an output
> size in xorg.conf?
>
> Same log shows both 60.0 and 59.9 1920x1080 modes. You could try forcing to use
> the other, or 50.0, at least to see if the problem remains.
$ xrandr # bad picture
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
DP-1 disconnected primary (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 connected 1920x1080+0+0 (normal left inverted right x axis y
axis) 160mm x 90mm
1920x1080 60.00*+ 50.00 59.94 30.00 25.00 24.00
29.97 23.98
1920x1080i 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 74.98 59.90
1280x960 60.00
1360x768 60.02
1280x800 59.91
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
$ xrandr -s 1920x1080 -r 30 # good picture, yeah! thanks!
$ xrandr # seems like I switched to 1080i
[...]
1920x1080 60.00 + 50.00 59.94 30.00 25.00 24.00
29.97 23.98
1920x1080i 60.00* 50.00 59.94
[...]
The problem remains using xrandr -s 1920x1080 -r 50.
What I do not understand is :
$ xrandr -s 1920x1080 -r 59.94
Rate 59.94 Hz not available for this size
Because the refresh rate is listed. Seems like a rounded output?
Also, documentation is lacking for xorg.conf.d (or I could not find
it) because the following does not seem to be taken into account :
$ cat /etc/X11/xorg.conf.d/20-samsung.conf
Section "Monitor"
Identifier "SAMSUNG"
Option "PreferredMode" "1920x1080i" # or whatever value
EndSection
so I'm stuck with the xrandr call in ~/.xsession .
>> I would also love
>> to get any other idea or pointer regarding solving this.
>
> Bring it up on:
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
Will do when I understand refresh rate manipulation a bit more.
Thanks _a lot_ for the pointers.
Alex
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