Le 03/11/2016 à 17:05, Philippe Dosch a écrit :
Le 03/11/2016 à 16:12, Łukasz Maśko a écrit :
Dnia czwartek, 3 listopada 2016 15:41:52 Philippe Dosch pisze:
Hi Folks,
I'm assistant professor and I teach with the same video projectors
since years (with each of the last three kubuntu releases on my
laptop). I have a strange trouble since my last kubuntu update (2
weeks ago). Now I'm under kubuntu 16.10, with a 1.18.4 Xorg server:
Hello!
I have exactly the same problem and it lies in the kernel itself,
probably in
i915 driver, not in X. The change was introuced in kernel 4.7.0, the
last of
the 4.6.x line (4.6.7) works fine. The changes deal with detection of
external
Display Port and as a result I get first an error like this:
[drm:intel_dp_start_link_train [i915]] *ERROR* failed to update link
training
Hi Dnia,
I have the same message several times at boot time (also found in
dmesg). But in my case, my troubles are related to the VGA port, not
the display port.
at the kernel start (visible in dmesg). And then this output is not
recognized
anymore. I have filed a bug report
https://bugs.freedesktop.org/show_bug.cgi?id=97397
I saw your post, but it is related to the display port and I don't
know if the DP trouble makes some side effects with the VGA port.
Maybe you can confirm it or append yours so we make developers fix
this? I
have no idea how to fix this myself. I'm just keeping kernel 4.6.7 to
use when
I want to do my presentations.
It's an idea, maybe I could downgrade to a 4.6.x kernel to see what
happens.
I've installed and booted on a 4.6.3 kernel and it works! So, with a
4.8 kernel, impossible to connect an external video projector, but
possible with a 4.6.3.
I told you that your message was about a display port whereas mine was
about a VGA one. But, by looking closer, it is true that, even if my
projector is connected to the VGA port, it is logically seen as a DP
one:
phil@IUTNC-DOSCH testkern % xrandr
03-11-2016 17:39:19
Screen 0: minimum 320 x 200, current 1920 x 1848, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+768 (normal left inverted right x
axis y axis) 309mm x 173mm
1920x1080 60.05*+ 59.93
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1360x768 59.80 59.96
1152x864 60.00
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
960x600 60.00
960x540 59.99
800x600 60.00 60.32 56.25
840x525 60.01 59.88
800x512 60.17
700x525 59.98
640x512 60.02
720x450 59.89
640x480 60.00 59.94
680x384 59.80 59.96
576x432 60.06
512x384 60.00
400x300 60.32 56.34
320x240 60.05
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected 1024x768+424+0 (normal left inverted right x axis y axis)
0mm x 0mm
1024x768 60.00*
800x600 60.32 56.25
848x480 60.00
640x480 59.94
HDMI-2 disconnected (normal left inverted right x axis y axis)
So, apparently, you're right with your analysis. I'm going to
contribute to your ticket.
If I have a good understanding, we have finally now to wait for a
kernel fix?
Thanks,
--
Philippe
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