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.
--
Philippe
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