** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial
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https://bugs.launchpad.net/bugs/1788308
Title:
[Regression] Colour banding appears on Lenovo B50-80
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-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag
** Tags added: cscc
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https://bugs.launchpad.net/bugs/1788308
Title:
[Regression] Colour banding appears on Lenovo B50-80 integrated
display
To manage notifications about this bug go
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Fix Committed
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** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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https://bugs.launchpad.net/bugs/1788308
Title:
[Regression] Colour banding appears on Lenovo B50-80
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-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag
** Tags added: verification-done-cosmic
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Title:
[Regression] Colour banding appears on Lenovo B50-80 integrated
display
To manage
This bug was fixed in the package linux - 4.18.0-9.10
---
linux (4.18.0-9.10) cosmic; urgency=medium
* linux: 4.18.0-9.10 -proposed tracker (LP: #1796346)
* Cosmic update: v4.18.12 upstream stable release (LP: #1796139)
- crypto: skcipher - Fix -Wstringop-truncation warnings
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
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Title:
[Regression] Colour banding appears on Lenovo B50-80 integrated
This should be fixed by next stable kernel update.
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Title:
[Regression] Colour banding appears on Lenovo B50-80 integrated
display
To manage
https://lkml.org/lkml/2018/8/23/86
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng)
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Title:
It worked like a charm - there is no more banding issue. Thank you very
much, Kai-Heng! Should this fix be checked on other versions of Ubuntu,
just let me know.
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Please give this kernel a try:
https://people.canonical.com/~khfeng/lp1788308/
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Title:
[Regression] Colour banding appears on Lenovo B50-80
Hello Joseph,
Thank you for your response. Unfortunately, installing and running the
latest upstream kernel, version 4.18.4-041804.201808220230, did not
solve my problem - the banding is still clearly visible, so I added an
appropriate tag.
** Tags added: kernel-bug-exists-upstream
** Changed
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.18 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix
** Description changed:
The problem affects the integrated display on a Lenovo B50-80 notebook.
Colour banding is visible everywhere on the system, as dithering seems
- not to be enabled. This issue was not present on non-HWE Ubuntu 16.04,
- and it showed up after upgrading to Ubuntu
** Attachment added: "version.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788308/+attachment/5178920/+files/version.log
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Title:
** Attachment added: "edid-decoded.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788308/+attachment/5178918/+files/edid-decoded.txt
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** Attachment added: "lspci-vnvn.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788308/+attachment/5178919/+files/lspci-vnvn.log
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** Attachment added: "edid.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788308/+attachment/5178917/+files/edid.txt
** Attachment removed: "edid-decoded.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788308/+attachment/5178901/+files/edid-decoded.txt
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