Re: on-screen artifacts (red pixels) at high resolution with Intel HD 630 (Kaby Lake)
Alexandre Rossi composed on 2017-12-21 23:01 (UTC+0100):
>> 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 didn't ask very well. What I was looking for was a display that gives you a
choice to use either DP or HDMI, idea being to see if the problem is avoided by
using the motherboard's DP output (if it has one, as mine with B250 chipset
does), even if a DP to HDMI adapter or cable would be required.
>> 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
...
> 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
Sometimes without a logically connected 'Section "Device"', legitimate monitor
options don't produce expected behavior.
Try adding this to the section, in addition to "1920x1080" (without the i), or
instead of:
VertRefresh 29-51
> so I'm stuck with the xrandr call in ~/.xsession .
Not likely. Any xrandr that works in ~/.xsession (user-specific) should work in
/etc/X11/ (global). :-) Try creating /etc/X11/Xsession.d/myscript if the
xorg.conf approach is too resistant.
>>> 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.
:-)
I've acquired a new Kaby Lake 630 since last thread reply, but I've only used it
with DisplayPort cable and on 2560x1080 and 1680x1050 screens so far. Current
dmesg running 4.9.65-3 kernel reports:
firmware: failed to load i915/kbl_dmc_ver1_01.bin (-2)
--
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Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
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