** Tags added: kernel-bug regression-release
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https://bugs.launchpad.net/bugs/2062951
Title:
Random flickering with i915 on Linux 6.8
Status in linux package in Ubuntu:
Update:
I did some preliminary testing and it seems like adding
"intel_idle.max_cstate=4" to cmdline resolves the issue but probably at the
power efficiency cost.
I also tried "i915.enable_psr=0" but it didn't help just made the
flickering a slightly different.
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Public bug reported:
After migrating Mantic 23.10 install to Linux 6.8.0, I am experiencing heavy
flickering at random.
It happens after a moderate to heavy on screen activity like window switching,
scrolling etc.
It never happens when playing video or when there is no interaction using
Seems like the bug is back.
It pops up occasionally (one error line every ~2 hours) on Linux 6.5.0-14,
6.6.0-14 and 6.8.0-20.
Appears on both Jammy: Xorg (Mate) and Mantic: Xorg/Wayland (Mate/KDE).
Default kernel cmdline.
On Xorg the graphics is fine, but on Wayland it can a bit "flickery" at
Update:
Since release of 6.8.0-20.20 real machine (XPS13) seems to be working fine.
VMs are still hanging.
Short testing showed that the issue is caused by RAM starvation.
Booting LiveCD or Desktop should consume ~1.2GB but under 6.8, it starts with
~2GB usage and keeps going up.
Maybe it is
** Package changed: linux (Ubuntu) => hwe-next
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https://bugs.launchpad.net/bugs/2049991
Title:
zswap is not working with Linux Kernel 6.5.x
Status in HWE Next:
New
Bug
I did not have the chance to see the logs but I can confirm that 6.8.0-11 is
extremely unstable.
It randomly but surely hangs under load.
It usually hangs at the beginning of default Ubuntu 24.04 ISO install on both
KVM and Virtual box.
On real H/W (Dell XPS13) it hangs under load (nothing in
Hello Mathew,
Thanks for responding so promptly.
I did test 6.8-rc1 and ZSWAP works as expected.
But I've noticed something odd.
To quickly test ZSWAP, I use eatmemory tool to allocate 7GB of 8GB on my system.
Allocating worked and ZSWAP activated but freeing 7GB of memory took ~45s
(system
Public bug reported:
I recently migrated to Mantic from Jammy and noticed that 6.5.0 has
"DEAD" zswap. It also didn't work with HWE-6.5.0 (both -9 and -14) on
Jammy.
Everything seems normal, all the parameters and no error msgs but frontswap
stays 0k at all times and everything gets swapped
Just wanted to share my observations.
At least on my machine, "failed resumes" are appearing in series after
initial BSOD (black screen of death), which usually occurs after a long
suspend.
After some experimentation, I've found that full/proper shut-down and
boot-up cycle (in addition to the
The bug also affects Xenial with Linux HWE (4.15.0.24.46).
No issues with Linux HWE (4.13.0.45.64).
** Also affects: linux-meta-hwe (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: linux-meta-hwe (Ubuntu Bionic)
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** Tags added: xenial
** Tags added: linux-hwe
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https://bugs.launchpad.net/bugs/1757445
Title:
Suspend does not always resume
Status in linux package in Ubuntu:
Public bug reported:
A firmware for embedded bluetooth adapter on Broadcom 4350 is missing.
Chip is provided as part of DW1820A/DW1830A on Dell XPS 2016 13/15 and probably
other machines.
More info at: https://wiki.archlinux.org/index.php/Dell_XPS_13_(2016)#Bluetooth
Device IDs:
* 0a5c:6412
*
Confirming #136.
Environment (on 2 machines):
Machine: XPS 13 9350 FHD Display
Distro: Ubuntu 16.04
Kernel: 4.4.0-24-generic
Bluetooth: off and on
Firmware: 1.3.3 and 1.4.3
DE: Unity and GnomeFlashback
Power: On battery and on AC
Screen: eDP (Built-In) or/and DP1 (External TB3/USBC->HDMI)
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@romano-giannetti and anyone who followed the instructions referenced in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1554613/comments/125,
There was a typo in instructions, please read bug description for details and
fix.
** Description changed:
*** Temporary workaround ***
** Description changed:
*** Temporary workaround ***
Install Kernel from the following location:
- http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-yakkety/
OR
Perform the following:
- $ apt-add-repository "deb
http://ppa.launchpad.net/canonical-kernel-team/ppa/ubuntu yakkety
** Description changed:
-
*** Temporary workaround ***
+ apt-add-repository "deb
http://ppa.launchpad.net/canonical-kernel-team/ppa/ubuntu yakkety main"
+ OR
Install Kernel from one of the following locations:
- http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.10-xenial/
-
** Description changed:
*** Temporary workaround ***
Install Kernel from the following location:
- http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-yakkety/
- OR (if you brave enough)
-
- Invoke: apt-add-repository "deb
http://ppa.launchpad.net/canonical-kernel-team/ppa/ubuntu
@kmstoilov Please make sure you've updated computer's firmware to 1.3.3.
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Title:
Screen flickers on XPS 13 9350/9550 (Intel
** Description changed:
+ *** Possible solution ***
+ The bug seems to be gone in 4.4.0-22:
+ - https://launchpad.net/ubuntu/+source/linux/4.4.0-22.39
+ ***
+
*** Temporary workaround ***
Install Kernel from one of the following locations:
- -
Hi all,
Please report your experience with 4.4.0-22.
It seems to be ok on my XPS13.
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Title:
Screen flickers on XPS 13 9350/9550
@arges I am also experiencing suspend issues on my XPS13 but before
opening a separate bug report I would like to check if our systems are
affected by the same bug.
Please check/confirm the following:
1. Is your system fails to resume or stuck during suspend? Please
suspend the system using
@bettini
I guess any 4.6.0rc+intel-drm-next starting 20160420 should work, but I
personally tested only the ones documented as a workaround in this bug
description.
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@pranith
On my system, 4.6.0rc3+intel-drm-next solved the issue.
Other people report solution only with more recent version,
4.6.0rc5+intel-drm-next.
The difference in reports might be related to installed BIOS version or/and
power management behavior in different conditions.
Anyways, I highly
** Description changed:
- see LP: #1552304
+ *** Temporary workaround ***
+ Install Kernel from:
+ - http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/current/
+ - http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc5-wily/
+
+
+ Please inspect duplicate reports
** Summary changed:
- screen flickering on XPS13 9350/9550
+ Screen flickers on XPS 13 9350/9550 (Intel Skylake/Broadwell GPU)
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*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
** This bug is no longer a duplicate of bug 1522922
Screen flickering in Intel i915 driver
** This bug has been marked a duplicate of bug 1554613
screen flickering on XPS13 9350/9550
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*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
** This bug has been marked a duplicate of bug 1554613
screen flickering on XPS13 9350/9550
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** Summary changed:
- screen flickering on XPS13 9350
+ screen flickering on XPS13 9350/9550
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Title:
Screen flickers on XPS 13
*** This bug is a duplicate of bug 1554613 ***
https://bugs.launchpad.net/bugs/1554613
** This bug has been marked a duplicate of bug 1554613
screen flickering on XPS13 9350
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Yes.
There is no noise or any other distortion when sound card is playing.
The noise starts 5-10 seconds after the playback is stopped.
In addition there are very loud clicks and pops during boot and shutdown.
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They patch was applied successfully but that did not help.
Just to be sure I've tested with Kernels 4.4.0-21 and 4.6.0-999.
Attaching new alsa-info.txt.
** Attachment added: "alsa-info.noisy.psn0.txt"
Attaching requested alsa-info.txt pair and the diff.
Besides constant noise there are terrible clicks and pops during system startup
and shutdown.
I've attached corresponding audio recordings.
** Patch added: "alsa-info.noisy.diff"
** Attachment added: "alsa-info.normal.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1468582/+attachment/4645619/+files/alsa-info.normal.txt
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** Attachment added: "alsa-info.noisy.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1468582/+attachment/4645620/+files/alsa-info.noisy.txt
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** Attachment added: "Shutdown.mp3"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1468582/+attachment/4645629/+files/Shutdown.mp3
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** Attachment added: "Startup.mp3"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1468582/+attachment/4645628/+files/Startup.mp3
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@anthonywong
Referenced report seems as unrelated.
On my machine, the sound is clear and loud but 10 seconds after playback
ends the noise starts.
I am not familiar with specific design of the soundcard but It
looks/sounds like when it suspended by the driver, analog amplifier left
active
Seems like Xenial is also affected by that issue, at least when audio device is
idling.
Should I create a new bug report for Xenial?
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I am still not 100% sure but after a day with this kernel:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc1-wily/ I can
report the following:
1. No flickering
2. No more kernel dumps/bugs reports
3. No more i915 warnings
4. No more suspend issues
5. No more Dell WMI events errors
6. Not
** Also affects: linux via
https://bugs.freedesktop.org/show_bug.cgi?id=94593
Importance: Unknown
Status: Unknown
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** Attachment added: "dmesg.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1554613/+attachment/4620483/+files/dmesg.log
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I would like to add few observations:
1. Seems like the issue is Power Management related since I've never
experienced it with AC adapter connected and sometimes almost instantly
after disconnecting it, the flickering is started.
2. Sometimes first "flick" after reboot or PM change is
** Description changed:
Driver update in Kernel 4.2 causes severe usability issues with Cypress
touchpad (cyapa) used on Acer C7x0 chromebooks.
The driver in question is ignoring events during entering/leaving idle
- status which from user standpoint seems like touchpad is not reacting
Public bug reported:
Driver update in Kernel 4.2 causes severe usability issues with Cypress
touchpad (cyapa) used on Acer C7x0 chromebooks.
The driver in question is ignoring events during entering/leaving idle
status which from user standpoint seems like touchpad is not reacting to
actions
apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550646/+files/WifiSyslog.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Tags added: linux-lts
apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550644/+files/UdevDb.txt
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apport information
** Attachment added: "PulseList.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550642/+files/PulseList.txt
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apport information
** Attachment added: "IwConfig.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550635/+files/IwConfig.txt
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apport information
** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550637/+files/Lsusb.txt
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apport information
** Tags added: apport-collected trusty
** Description changed:
Driver update in Kernel 4.2 causes severe usability issues with Cypress
touchpad (cyapa) used on Acer C7x0 chromebooks.
The driver in question is ignoring events during entering/leaving idle
status
apport information
** Attachment added: "RfKill.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550643/+files/RfKill.txt
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apport information
** Attachment added: "BootDmesg.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550632/+files/BootDmesg.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550640/+files/ProcInterrupts.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550639/+files/ProcEnviron.txt
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apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550636/+files/Lspci.txt
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apport information
** Attachment added: "UdevLog.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550645/+files/UdevLog.txt
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apport information
** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550633/+files/CRDA.txt
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apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550641/+files/ProcModules.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550638/+files/ProcCpuinfo.txt
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** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1534661/+attachment/4550634/+files/CurrentDmesg.txt
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The reason for the failure seems to be in default configuration of PAM
for SSH.
If I understand correctly, PAM is configured to enforce session keys revocation
upon termination of parent SSHD process:
--- /etc/pam.d/sshd ---
...
# Create a new session keyring.
sessionoptional
Refer to #1377924 if you still encounter the problem.
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https://bugs.launchpad.net/bugs/1234412
Title:
ecryptfs fails to mount (Unable to link the KEY_SPEC_USER_KEYRING
I've learned that the issue is not related to kernel version but caused
by environment under which mount is executed.
On my systems (14.04), it fails when executed inside x2go session but
manages to operate when connected via physical VT or SSH.
May be it's related to apparmor, but how x2go and
Public bug reported:
This is a reincarnation of Bug #1234412.
Looks like issue is not related to specific kernel versions.
Currently I am observing two Trusty (14.04) machines, with very close
configuration, running same kernel:
3.13.0-36-generic #63-Ubuntu SMP Wed Sep 3 21:30:07 UTC 2014
After upgrade to Linux 3.13.0-11.31, the problem is gone.
I guess if no one will report the opposite, bug can be set as fixed.
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** Summary changed:
- ecryptfs exits with error message
+ ecryptfs fails to mount (Unable to link the KEY_SPEC_USER_KEYRING into the
KEY_SPEC_SESSION_KEYRING)
** Description changed:
+ ecryptfs seems to be currently broken on Trusty.
+ System: Trusty
+ Linux: 3.13.0-8-generic #28-Ubuntu
+
*** This bug is a duplicate of bug 1217189 ***
https://bugs.launchpad.net/bugs/1217189
** This bug is no longer a duplicate of bug 1215513
System locks up, requires hard reset
** This bug has been marked a duplicate of bug 1217189
Buffer I/O error on device zram0 (possibly causing
*** This bug is a duplicate of bug 1217189 ***
https://bugs.launchpad.net/bugs/1217189
** This bug is no longer a duplicate of bug 1215513
System locks up, requires hard reset
** This bug has been marked a duplicate of bug 1217189
Buffer I/O error on device zram0 (possibly causing
** Summary changed:
- Buffer I/O error on device zram0 (possibly causing complete machine lockup)
+ Buffer I/O error on device zram0
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Public bug reported:
Please enable ZSWAP in Saucy's kernel config.
In runtime, module is not enabled by default so there no risk of regressions.
ZSWAP finally merged in Linux 3.11.
ZSWAP should replace previous solutions as ramzswap and zram and should provide
a solution for SSD based or/and
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