** Description changed:
+ == SRU Justification ==
+
+ [Impact]
+ Wobbly graphics after a kernel update.
+
+ [Fix]
+ Older panels may require more bandwidth then advertised, so we need to
+ use max params for them.
+
+ [Test]
+ Multiple users tested with positive result.
+
+ [Where problems could occur]
+ This patch reverts to the old behavior, which is to use max parameters,
+ for older panels. If there's any new panel reports with older DP
+ version, this might change the behavior on it.
+
+ == Original Bug Report ==
+
Lenovo laptop with Intel + Nvidia graphics.
Since booting from linux-image-5.11.0-22-generic, the built-in display is
unusable, with wobbling horizontal stripes from the disk decryption prompt
onwards:
https://www.youtube.com/watch?v=LyRTuPzCe2I
HDMI output works fine.
If I boot from linux-image-5.11.0-18-generic instead, all is well.
If I use Recovery mode with linux-image-5.11.0-22-generic and continue
bootup, it's usable but there's no HDMI output.
I think others may be having this issue too:
https://askubuntu.com/questions/1351188/weird-graphical-glitches-appears-only-on-integrated-display-on-any-ubuntu-base#
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-5.11.0-22-generic 5.11.0-22.23
ProcVersionSignature: Ubuntu 5.11.0-22.23-generic 5.11.21
Uname: Linux 5.11.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: alex 1598 F.... pulseaudio
/dev/snd/controlC0: alex 1598 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sat Jul 17 09:50:31 2021
InstallationDate: Installed on 2021-01-03 (194 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
MachineType: LENOVO 80DU
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-22-generic
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-5.11.0-22-generic N/A
linux-backports-modules-5.11.0-22-generic N/A
linux-firmware 1.197.2
SourcePackage: linux
UpgradeStatus: Upgraded to hirsute on 2021-05-22 (55 days ago)
dmi.bios.date: 08/18/2014
dmi.bios.release: 1.49
dmi.bios.vendor: LENOVO
dmi.bios.version: 9ECN31WW(V1.14)
dmi.board.asset.tag: 31900058WIN
dmi.board.name: Lenovo Y70-70 Touch
dmi.board.vendor: LENOVO
dmi.board.version: 31900058WIN
dmi.chassis.asset.tag: 31900058WIN
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Y70-70 Touch
dmi.ec.firmware.release: 1.49
dmi.modalias:
dmi:bvnLENOVO:bvr9ECN31WW(V1.14):bd08/18/2014:br1.49:efr1.49:svnLENOVO:pn80DU:pvrLenovoY70-70Touch:rvnLENOVO:rnLenovoY70-70Touch:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoY70-70Touch:
dmi.product.family: IDEAPAD
dmi.product.name: 80DU
dmi.product.sku: LENOVO_MT_80DU_BU_idea_FM_Lenovo Y70-70 Touch
dmi.product.version: Lenovo Y70-70 Touch
dmi.sys.vendor: LENOVO
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Impish)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.13 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => Won't Fix
** Changed in: linux (Ubuntu Hirsute)
Status: New => Confirmed
** Changed in: linux (Ubuntu Impish)
Status: New => Confirmed
** Changed in: linux-oem-5.13 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux-oem-5.13 (Ubuntu Hirsute)
Status: New => Invalid
** Changed in: linux-oem-5.13 (Ubuntu Impish)
Status: New => Invalid
** Changed in: linux (Ubuntu Hirsute)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Impish)
Importance: Undecided => Medium
** Changed in: linux-oem-5.13 (Ubuntu Focal)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1936708
Title:
Wobbly graphics on built-in display since linux-
image-5.11.0-22-generic
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