It looks as though the fix in question is here, @thedarb:
https://github.com/torvalds/linux/commit/39bd984c203e86f3109b49c2a2e20677c4d3ab65
#diff-b6ef73099a107b24fe74fff27007e7d6
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Looks like this affects me, also using a Dell XPS 15 9530.
I can confirm seeing the following line output each time the UI hangs:
Mar 31 20:06:52 luke-ultrabook kernel: nouveau :02:00.0: bus: MMIO
write of 0002 FAULT at 4188ac [ IBUS ]
I also experience repeat input (as if I were holding
Reported via ubuntu-bug -- hope this helps:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1760341
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https://bugs.launchpad.net/bugs/1756877
Title:
High visual latency
FYI I'm currently mitigating this using Bumblebee:
https://wiki.ubuntu.com/Bumblebee#Setup_for_14.04_and_later
I've not yet been able to get applications running against the discrete
chip, but since I'm now running with onboard Intel graphics the
stuttering is no longer an issue.
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Public bug reported:
I'm running a HP EliteBook 840 G5 and HP UlstraSlim Docking Station with
two external DisplayPort displays (both 1080p). Upon docking the machine
for the first time the two external displays come up as expected. Upon
removal the internal display continues to work as expected,
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