Please also try:
1. sudo apt install edid-decode
2. sudo get-edid | edid-decode > edid-decoded.txt
3. Attach 'edid-decoded.txt' to this bug.
** Summary changed:
- Colour banding and artefacts appear system-wide on an Asus Zenbook UX303LA
with Intel HD 4400 graphics
+ [regression] Colour
Scrap that. Try this instead:
1. sudo apt install read-edid
2. sudo get-edid | parse-edid > edid.txt
3. Attach 'edid.txt' to this bug.
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I guess we can answer that question by seeing the EDID for the LCD
panel.
Please try this:
1. Log into Ubuntu on Xorg (or just 'Ubuntu' if there's no such option).
2. Run this in a terminal: xrandr --verbose > xrandr.txt
3. Attach xrandr.txt to this bug.
** Changed in: linux (Ubuntu)
Attached is the difference between kernel 4.7 and 4.8 in the Intel
graphics driver. It's still a big diff, but at least eliminates my above
theories about the cause of the regression. Now the main suspect, I
think, would be:
@@ -12095,21 +12181,11 @@ connected_sink_compute_bpp(struct
Excellent! That was my next question - for you to narrow it down
further. Thanks.
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https://bugs.launchpad.net/bugs/1749420
Title:
Colour banding and artefacts appear
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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Or maybe pipe_bpp is some other weird value...
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Title:
Colour banding and artefacts appear system-wide on an Asus Zenbook
UX303LA
if (intel_dp->compliance.test_data.bpc != 0)
this seems like a simple bug per above;
else
it's some other problem;
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Title:
Wait a minute... it sounds like dithering is always going to be disabled
(since commit 611032bfa71a7) for the case of (pipe_config->pipe_bpp ==
6*3).
index 5a9da484bb23..ef65b4be5e56 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13060,8 +13060,11
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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Title:
Colour banding and artefacts appear system-wide on an Asus
Judging by the dates, this change might be related:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/i915/intel_display.c?h=v4.16-rc1=611032bfa71a7634e801142016f2d41485f8638f
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** Tags added: visual-quality
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Title:
Colour banding and artefacts appear system-wide on an Asus Zenbook
UX303LA with Intel HD
Yes, based on what I can find, the Haswell UX303LA has about 61% sRGB
coverage so it sounds likely to be a 6-bit (AKA 18-bit) panel, which
makes it sound even more likely that comment #5 is the cause of the
problem.
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