I can confirm that the fix in the Cosmic kernel is sufficient. Will this
be backported to Bionic and Xenial HWE?
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Title:
Suspend fai
Confirmed that Rafael's patched kernel fixes the issue on an Asus
Zenbook UX303LA which exhibited the same problem that the OP described
(issue occured with at least 4.15 and 4.17) on Ubuntu 16.04. I tested
the suspend function with the patched kernel over two days.
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Oh, of course, you are right, Mr. Van Vugt.
I tested the linux-hwe kernel 4.13.0-40.45~16.04.1 from xenial-proposed,
and that kernel fixes the regression. This was, of course, tested under
Xenial.
Thank you again for your efforts! :-)
** Changed in: linux-hwe (Ubuntu)
Status: New => Fix C
This regression does not affect Xenial, so the fix is redundant.
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Title:
[regression] Colour banding and artefacts appear system-wid
In *Bionic*, the kernel in proposed (4.15.0-13.14) and in release
(4.15.0-12.13) both fix this regression.
I won't test the fix on Artful; I don't have the system installed and I
don't want to spend the time since Artful won't be supported for very
long anyway (and this bug affects only very few u
Thank you for your efforts. I honestly hadn't expected this issue to be
fixed or even looked at (especially since it seemingly only affects
users with this specific laptop model) and I am positively surprised.
Am I correct in assuming that one of you will now push a fix to
upstream? :-)
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Okay, I googled the procedures, but in case they're wrong I'm logging
them here:
I used the kernel provided by Feng for this procedure (4.15.0-9).
- Chose Advanced options in grub menu, selected kernel and pressed 'e'.
- Added 'drm.debug=0x0e' to the end of the 'linux' line.
- Pressed Ctrl+x and s
Could you please be a bit more specific? I haven't done this before, you
see. By 'mainline kernel' do you mean the kernel that you provided in
your previous post? And how do I boot with a kernel parameter (from grub
maybe?) and where do I find the dmesg afterwards?
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Congratulations Mr. Feng, the kernel you provided fixes the issue
completely! Colours now display as fine as on my Ubuntu 16.04 install.
That is just great.
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The colour artefacts seems to have been introduced in 4.8-RC2. 4.8-RC1 is
**not** affected.
In case it's relevant: I downloaded and installed the kernels with UKUU as
before (which uses kernels from Ubuntu mainline repo).
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It probably doesn't matter, but in case it does: the outputs were
produced on 18.04 under Xorg and kernel 4.13.
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Title:
[regression]
** Attachment added: "edid-decoded.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749420/+attachment/5056594/+files/edid-decoded.txt
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** Attachment added: "Output of sudo get-edid | parse-edid > edid.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749420/+attachment/5056593/+files/edid.txt
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ht
If it's any help, this problem seems to have been introduced in kernel
4.8. I tested different kernels with UKUU. Kernels prior to 4.8 do not
have the colour banding issue.
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h
I just installed the 4.15.0-10 kernel that you provided and rebooted.
The colours didn't improve; the same artefacts and banding still appear
like they did on kernel 4.13.
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ht
Public bug reported:
- Ubuntu 18.04 (with updates as of 14 Feb 2018).
- Laptop: Asus Zenbook UX303
- CPU: Intel i5 4210U
- Graphics: Intel HD 4400
Problem description: Colour artefacts and banding in all apps. Graphics,
photos and videos display as though the colour range is improperly
configured
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