** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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Title:
External displays not working on Thinkpad T490 with
This bug was fixed in the package linux - 5.11.0-37.41
---
linux (5.11.0-37.41) hirsute; urgency=medium
* hirsute/linux: 5.11.0-37.41 -proposed tracker (LP: #1944180)
* CVE-2021-41073
- io_uring: ensure symmetry in handling iter types in loop_rw_iter()
* Packaging resync
** Tags removed: verification-needed-hirsute
** Tags added: verification-done-hirsute
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Title:
External displays not working on
Thank you for the note, Tomas. Aaron, may you please help with the
verification on this? Thank you!
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Title:
External displays not
Thanks for the fix. I'm not sure to whom the previous message is
addressed but I will not be able to test it because I'm will not be at
the office until end of September.
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This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
hirsute' to 'verification-done-hirsute'. If the problem still exists,
change the tag
** Changed in: linux (Ubuntu Hirsute)
Status: In Progress => Fix Committed
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Title:
External displays not working on Thinkpad
** Changed in: linux (Ubuntu Hirsute)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Hirsute)
Status: New => In Progress
** Changed in: linux (Ubuntu Hirsute)
Assignee: (unassigned) => AaronMa (mapengyu)
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** Description changed:
I have two external displays chained via Display port connected to the
ThinkPad Thunderbolt 3 Dock.
They are working with kernel 5.8.0-63 but not with the new 5.11.0-25
kernel.
I could reproduce this behavior several times for both kernels, as
follows: I
** Description changed:
I have two external displays chained via Display port connected to the
ThinkPad Thunderbolt 3 Dock.
They are working with kernel 5.8.0-63 but not with the new 5.11.0-25
kernel.
I could reproduce this behavior several times for both kernels, as
follows: I
@aaron,
Tried the 5.11.0-26.28-lp1938999-generic kernel, it works fine. You
could check more about it from this log. Thanks!
** Attachment added: "journalctl.l15.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1938999/+attachment/5518358/+files/journalctl.l15.log
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Hi BinLi:
Could you try ppa:
https://launchpad.net/~mapengyu/+archive/ubuntu/bionic-oem
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Title:
External displays not working on
Thanks BinLi,
I will SRU it.
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Title:
External displays not working on Thinkpad T490 with ThinkPad
Thunderbolt 3 Dock
Status in
I build a kernel based on v5.12-rc4, and cherry-pick below commit, this
issue is fixed.
3f3a9bc1f6df drm/i915/ilk-glk: Fix link training on links with LTTPRs
And I tried to cherry-pick the other two commits. It's still good.
ab03631087f5 drm/i915: Disable LTTPR support when the LTTPR rev < 1.4
I think the following commits are the fixes:
ab03631087f5 drm/i915: Disable LTTPR support when the LTTPR rev < 1.4
7dffbdedb96a drm/i915: Disable LTTPR support when the DPCD rev < 1.4
3f3a9bc1f6df drm/i915/ilk-glk: Fix link training on links with LTTPRs
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I also found the fixed patch should between v5.12-rc4 and v5.12-rc5.
v5.12 works.
v5.11.22 doesn't work.
v5.12-rc4 doesn't work.
v5.12-rc6 works.
v5.12-rc5 works.
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I tried the maniline kernel with bisect method. We need bisect the patch
from v5.10.57 to v5.11-rc2, and v5.11-rc1 didn't provide deb package
because of building failure.
v5.10 works fine
v5.10.57 works fine
v5.11 doesn't work
v5.11-rc4 doesn't work
v5.11-rc2 doesn't work
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I could reproduce this issue on L15, when I insert DP cable, it show a
lot of '*ERROR* Link Training Unsuccessful'. And from the xrandr I found
the DP monitor was recognized, and I could move mouse to this external
monitor, but the screen is black.
Aug 12 23:45:05 u-ThinkPad-L15-Gen-1 kernel:
I am trying to find T490 to reproduce.
Please wait a while.
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Title:
External displays not working on Thinkpad T490 with ThinkPad
I also installed the 5.13.9 kernel, again with the same unmet
dependency:
dpkg: dependency problems prevent configuration of
linux-headers-5.13.9-051309-generic:
linux-headers-5.13.9-051309-generic depends on libc6 (>= 2.33); however:
Version of libc6:amd64 on system is 2.31-0ubuntu9.2.
To
There seems to be a dependency problem with linux-
headers-5.13.0-051300-generic:
dpkg: dependency problems prevent configuration of
linux-headers-5.13.0-051300-generic:
linux-headers-5.13.0-051300-generic depends on libc6 (>= 2.33); however:
Version of libc6:amd64 on system is
I tested again on kernels 5.8 and 5.11 with nvidia-driver-470. Logs are
attached.
With 5.8 kernel, the external displays eventually come to live, after
connecting the dock and some waiting (~15 s). After first connection, it
seemed to be doing several trials, in the end it worked too.
With 5.11
I didn't reproduce this issue on T590 with 5.11.0-25 kernel.
Please try dock or DP again.
And the 5.13 kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.13/amd64/
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Thanks for looking into this. I changed the drivers to nouveau to
workaround some previous issues I had with external displays and then I
forgot made this change.
Could you point me to how to test with 5.13/5.14 kernels, please? If
possible I would like to stick to the default drivers/kernel.
nouveau is used instead of nvidia-driver.
external display highly depends on nvidia gpu.
Could you try 5.13/5.14 kernel?
Or 5.13 with nvidia-driver?
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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