*** This bug is a duplicate of bug 1958191 ***
https://bugs.launchpad.net/bugs/1958191
Same here, after upgrading from 20.04 on my ThinkPad E460 which had been
working fine for years.
lshw | grep -A2 display
*-display
description: VGA compatible controller
p
Same here with my ThinkPad E460. Everything was working fine with 20.04.
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https://bugs.launchpad.net/bugs/1971437
Title:
linux-image-5.15.0-27-generic causes Thinkpad T460p
*** This bug is a duplicate of bug 1958191 ***
https://bugs.launchpad.net/bugs/1958191
> Is there any reliable solution to this bug ?
It looks like the following is working for everyone so far:
1. Edit /etc/default/grub to add append i915.enable_dc=0
intel_idle.max_cstate=2 to the contents
I tried version-bisecting the issue using the mainline kernel ppa, as in
https://wiki.ubuntu.com/Kernel/KernelBisection#Version_bisecting_upstream_kernels
The last good version is 5.14.20.
The first bad version is 5.14.21.
Just to be sure this hasn't been fixed in the meantime, I tried 5.18-r6
a
I also experience flickering with Ubuntu 22.04's 5.15.0-27-generic
kernel, which goes away with i915.enable_dc=0 intel_idle.max_cstate=2,
and was not present with Ubuntu 20.04's latest 5.13 kernel.
Due to another bug affecting my machine, I'm now running the vanilla
5.14.20 kernel from the mainlin
I tried commit-bisecting the issue, but the build instructions are not
working for me.
However, I'd like to point out that there are only 15 commits between
5.14.20 (working for me) and 5.14.21 (not working for me).
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/log/?h=linux-5.14
After seeing the previous comment, I decided to try 5.18, so I installed
5.18.2 from the mainline ppa and it fixes the problem for me as well.
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I've installed 5.18.2 from the mainline ppa yesterday and have been
running it without i915.enable_dc=0 intel_idle.max_cstate=2 since then.
No flickering so far.
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I'm happy to report that the problem seems to be gone with the
5.15.0-40-generic kernel. I've been able to suspend and resume two times
since booting it.
Maybe you should give it a try? If 5.15.0-40 fixes it for you as well,
then it probably means this bug can be closed.
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You received this bug
Public bug reported:
After a routine upgrade which installed the 6.8 kernel, my laptop
(Lenovo Thinkpad E460) stopped resuming from suspend. I press keys, hit
the power button, but nothing works and I have to hard reboot in the
end.
Everything worked nicely with the 6.5 kernel (6.5.0-45-generic)
apport information
** Tags added: apport-collected
** Description changed:
After a routine upgrade which installed the 6.8 kernel, my laptop
(Lenovo Thinkpad E460) stopped resuming from suspend. I press keys, hit
the power button, but nothing works and I have to hard reboot in the
end.
apport information
** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818168/+files/CRDA.txt
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Ti
apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818169/+files/CurrentDmesg.txt
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apport information
** Attachment added: "IwConfig.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818170/+files/IwConfig.txt
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apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818171/+files/Lspci.txt
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apport information
** Attachment added: "Lspci-vt.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818172/+files/Lspci-vt.txt
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apport information
** Attachment added: "Lsusb-t.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818173/+files/Lsusb-t.txt
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apport information
** Attachment added: "PaInfo.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818175/+files/PaInfo.txt
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apport information
** Attachment added: "Lsusb-v.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818174/+files/Lsusb-v.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818176/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818177/+files/ProcCpuinfoMinimal.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818178/+files/ProcEnviron.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818179/+files/ProcInterrupts.txt
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apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818180/+files/ProcModules.txt
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apport information
** Attachment added: "RfKill.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818182/+files/RfKill.txt
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** Attachment added: "PulseList.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818181/+files/PulseList.txt
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apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818183/+files/UdevDb.txt
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apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818184/+files/WifiSyslog.txt
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** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/bugs/2080693/+attachment/5818185/+files/acpidump.txt
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Ok, turns out it's not a version issue but a config issue:
CONFIG_INTEL_IOMMU_DEFAULT_ON=y is what causes the problem. The reason
that 6.6.18 from the mainline ppa is good while 6.6.19 is bad is that
the former has this disabled while the later has it enabled:
% diff -u0 /boot/config-6.6.1*-generi
Got my hands on a beefier machine where I was able to build a config of
6.6.19 that (once installed on my laptop) exhibits the same problem as
the one from the mainline ppa.
Compared to may previous attempt:
1. Kept the config unchanged.
2. Instead did apt install linux-buildinfo-6.8.0-48-generic
For what it's worth, the problem persists with the 6.8.0-48-generic
kernel.
Also, I've tried building the kernel locally in order to hopefully
commit-bisect the issue. Turns out my locally compiled 6.6.19 does not
exhibit the problem, while 6.6.19 from the mainline kernel ppa does.
I've done the
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