[KDE5 Session] Intel driver oops message: invalid max DP link bw val 0, using 1.62Gps

[Benedikt]

Kubuntu 15.04 start without problems to the display manager sddm. If I enter my password the display is blank for a second and then does kubuntu load forever the desktop environment.

Dmesg shows several oopses in the intel driver:

invalid max DP link bw val 0, using 1.62Gps

and

compute-config() on unknown output!

I think this problem occurs since the update to 3.19.0-9.

Kernel 4.0-rc5 tested with the same problem.
---
ApportVersion: 2.16.2-0ubuntu4
Architecture: amd64
DistroRelease: Ubuntu 15.04
HibernationDevice: UUID=3383b02e-b89c-462c-903a-cb936e81b2bf
InstallationDate: Installed on 2014-12-21 (93 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141218)
MachineType: LENOVO 20354
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-10-generic root=UUID=b549945a-67ac-4d14-849c-b54e561d47cc ro xforcevesa quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-10-generic N/A
 linux-backports-modules-3.19.0-10-generic N/A
 linux-firmware 1.143
Tags: vivid vivid
Uname: Linux 3.19.0-10-generic x86_64
UnreportableReason: The report belongs to a package that is not installed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 10/20/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: 9BCN29WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Lancer 5A5
dmi.board.vendor: LENOVO
dmi.board.version: 31900058WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Z50-70
dmi.modalias: dmi:bvnLENOVO:bvr9BCN29WW:bd10/20/2014:svnLENOVO:pn20354:pvrLenovoZ50-70:rvnLENOVO:rnLancer5A5:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoZ50-70:
dmi.product.name: 20354
dmi.product.version: Lenovo Z50-70
dmi.sys.vendor: LENOVO

[Benedikt (benedikt-klotz)]

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[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Does this issue go away if you boot back into the 3.18 kernel? It can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18.10-vivid/

[Benedikt (benedikt-klotz)]

I have tested the 3.18 kernel from the repo and the problem remains. The oops messages are also the same. Since kde has worked with 3.18 in the past this seems very odd.

I have tried to reset the settings in kde and see if that helps, but no luck with that.

It could be that the kernel oops are only fatal to kde with the latest kde updates. Or it could be that the kernel oops are completly unrelated to my login problem ...

Do you have an idea what I could do to localize the problem?

[Benedikt (benedikt-klotz)]

Hm very strange I can boot in a live session with the daily iso of kubuntu from today without a problem. However I see also no oops messages in dmesg...

[Benedikt (benedikt-klotz)]

Ok a new user triggers no oops messages and can start without problems.

After I renamed my .config directory I can also login with my old account.

However with this user the oops messages are still triggered when I login.

Something in my (kde5) config must trigger this oops message..

[Özgür Caner (oc-b)]

Since the latest kernel update ( 3.19.0-18-generic ) on vivid, regular ubuntu installation updated from trusty, I experience the mentioned issue but with different results.

Unity desktop and Xorg are running without any issues, but I've no sound output via HDMI/DP, which was available with the previous kernel.

[penalvch (penalvch)]

Özgür Caner, as you have a different trace, please file a new report via a terminal:
ubuntu-bug linux

Please feel free to subscribe me to it.

[Özgür Caner (oc-b)]

Thanks Christopher, I already commented on another bug which seems to be a better match, see bug 1453447 .

[penalvch (penalvch)]

Özgür Caner, unfortunately, commenting on someone else's report isn't going to be nearly as helpful (let alone lead to a fix quicker) as filing a new report as previously requested of you.

Benedikt, just to get back to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1435898/comments/21 , was this in the Vivid live environment or Trusty?

Also, is this reproducible in the latest mainline kernel (4.1-rc1)?

[Özgür Caner (oc-b)]

Yeah Christopher, I know, but unfortunately I read the bug guidelines after I commented on this and the other bug.

Ok, I'll open a new bug report for my issue and refer to the bug 1453447 and test the latest mainline kernel.

Sorry for the inconvience I'm just quite new to Launchpad.

[Launchpad Janitor (janitor)]

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