** Changed in: linux (Ubuntu)
Status: Triaged => Fix Released
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Title:
[Dell XPS 15 9575] Flickering white/black screen once
fwiw, this is fixed in kinetic with its 5.19 kernel
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Title:
[Dell XPS 15 9575] Flickering white/black screen once KMS comes up
This bug is not fixed by 5.15.0-40-generic, and still occurs with that
kernel
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Title:
[Dell XPS 15 9575] Flickering white/black
** Changed in: linux
Status: Unknown => New
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Title:
[Dell XPS 15 9575] Flickering white/black screen once KMS comes up
** Tags added: rls-jj-incoming
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Title:
[Dell XPS 15 9575] Flickering white/black screen once KMS comes up
Status in Linux:
any plans to address this in jammy? haven't had any movement on the
upstream bug so I assume reverting that one commit is probably the best
option?
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also fwiw, confirmed that starting from tag Ubuntu-5.15.0-25.25 (commit
f4a9abe17854fc753c84a0ba4ac275e715a008f3), reverting commit
6d7a793aabf31d7ba2b16fc13a94ccf0b90e4be0 applies cleanly and fixes the
bug.
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found some other reports that claim i915.fastboot=0 is a workaround, and
can confirm it does work around the issue on jammy's current 5.15
kernel.
https://www.reddit.com/r/pop_os/comments/scqr4n/dell_xps_15_9575_screen_flickering_upon_boot/
https://bugs.archlinux.org/task/72134
** Bug watch added: gitlab.freedesktop.org/drm/intel/-/issues #5534
https://gitlab.freedesktop.org/drm/intel/-/issues/5534
** Also affects: linux via
https://gitlab.freedesktop.org/drm/intel/-/issues/5534
Importance: Unknown
Status: Unknown
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Hm. That commit has too many dependencies to cherry-pick (or even
cherry-pick a small series) without significant conflicts. It might be
still possible to *understand* the patch and write an equivalent for
5.15.
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Thanks for that bisect.
Annoyingly, that commit doesn't cherry-pick cleanly onto 5.15, but I'll
see if I can munge it up to test.
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If I didn't get my good/bad confused on the reverse bisection, this
appears to be the commit that fixes it:
5ac860cc52540df8bca27e0bb25b6744df67e8f0 is the first bad commit
commit 5ac860cc52540df8bca27e0bb25b6744df67e8f0
Author: Ville Syrjälä
Date: Thu Mar 3 21:12:06 2022 +0200
drm/i915:
Nope. It looked like a good candidate, but isn't the fix.
5.17.1 fails, drm-tip succeeds, so the fix is somewhere between v5.17
and drm-tip. I'm (slowly) bisecting to find the commit that fixes it.
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I suspect this may have been fixed by
9ce5884e5139037445d0efcf37aeba21008011ad; I'm building an Ubuntu kernel
with that cherry-picked to test.
Hm. Although that seems to have been included in 5.16, and I *thought*
I'd verified that 5.16 exhibited the bug?
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appears to be fixed in drm-tip 2022-03-29 packages
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Title:
[Dell XPS 15 9575] Flickering white/black screen once KMS comes up
Confirmed, 6d7a793aabf31d7ba2b16fc13a94cc is bad, it's predecessor is
good.
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Title:
[Dell XPS 15 9575] Flickering white/black
Next please verify the bug is present in drm-tip:
https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/
and if so then report it upstream:
https://gitlab.freedesktop.org/drm/intel/-/issues
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Well I just learned something new, thanks. I usually do chronological
searches from the offending commit but clearly that's error-prone in a
non-linear graph.
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
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Yeah I was confused that the built kernel versions were in the v5.13-rc
range, but according to `git tag --contains
6d7a793aabf31d7ba2b16fc13a94ccf0b90e4be0` (and the list of tags in
https://github.com/torvalds/linux/commit/6d7a793aabf31d7ba2b16fc13a94ccf0b90e4be0)
v5.14-rc1 is the first tag that
Or maybe it is indeed two bugs and 6d7a793aabf3 was just the first
commit to exhibit either.
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Title:
[Dell XPS 15 9575] Flickering
Nice work. That suggests the problem started in v5.13-rc6 though, which
is a whole major kernel version earlier than we thought.
Chris, can you confirm?
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after bisection:
6d7a793aabf31d7ba2b16fc13a94ccf0b90e4be0 is the first bad commit
commit 6d7a793aabf31d7ba2b16fc13a94ccf0b90e4be0
Author: José Roberto de Souza
Date: Fri May 14 16:22:45 2021 -0700
drm/i915/display: Allow fastsets when DP_SDP_VSC infoframe do not match
with PSR enabled
Some time ago, yes: https://ubuntu.com/certified/201807-26342
but that system had a different secondary GPU type.
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Title:
[Dell
Was the Precision 5530 2-in-1 version of this machine ever certified?
don't know if it would have the exact same issue but its the same
chipset.
In the meantime I'm attempting to bisect the mainline kernel to find the
commit that broke this.
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Turns out that Ubuntu never certified the XPS 9575 so no we don't have a
kernel fix prepared and hiding anywhere.
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Title:
[Dell XPS
I feel like the OEM team would have encountered and fixed this already.
Can you try an OEM kernel?
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Title:
[Dell XPS 15 9575]
The other bug mentions that the flickering seems unrelated to the
blackness.
Fixing the flickering needed i915.enable_psr=0
Fixing the blackness needed kernel <= 5.13.19 (or generally < 5.14)
** Tags added: i915 regression regression-release
** Changed in: linux (Ubuntu)
Importance:
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