I don't have this problem any more. It is possible that it was due to a
faulty VGA cable.
** Changed in: linux (Ubuntu)
Status: Incomplete = Fix Released
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I tested the upstream kernel, and the problem still exists.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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I found out, that this seems to be related to the SATA power management.
If I use powertop and enable Enable SATA link power Managmenet for
host1, the errors stop.
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Although, from time to time I still get messages like
[ 191.343588] ata1.00: status: { DRDY }
[ 191.343594] ata1: hard resetting link
[ 192.065491] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[ 192.065923] ata1.00: unexpected _GTF length (8)
[ 192.066360] ata1.00: unexpected _GTF
It also happens after suspend and resuming
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https://bugs.launchpad.net/bugs/1318218
Title:
SATA problems on MacBook Pro 11,1?
Status in “linux” package in Ubuntu:
Public bug reported:
I am running 14.04 on a MacbookPro and wanted to connect my laptop to a
projector using Apple's mini-displayport to vga adapter (which is
plugged into the thunderbolt interface). However, the projector was not
recognized and I was not able to get output on the projector.
I tested kernel 3.15-rc5 and the bug is still present there.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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I found out, that if I start the laptopt without it being connected to
the power supply, this errors do not occur. But once I plug it in, the
errors start, and continue even after I plug it out.
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I think I have a similar problem
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1318218https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1318218
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Public bug reported:
I installed Ubuntu 14.04 next to MacOS following the guide at
https://help.ubuntu.com/community/MacBookPro11-1/Saucy/
Looking into dmesg, I constantlz get entries like
[ 276.380934] ata1: SError: { PHYRdyChg }
[ 276.380943] ata1: hard resetting link
[ 277.103527] ata1:
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