screen flickering at boot

[skt.diaz]

everytime i start my computer a purple screen appears followed by a white flickering for 2 seconds. then screen goes black till login screen comes up. the ubuntu logo with progressing dots dont show up as they used to when i used ubuntu 14.10. i am using defalut radeon driver in 15.04. is there a fix for this because it looks very ugly when other people use my laptop. once booted up i have no problem with graphics. when i shut down i can see the ubuntu logo screen with dots.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-16-generic 3.19.0-16.16
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jeet 1440 F.... pulseaudio
 /dev/snd/controlC1: jeet 1440 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed May 6 13:47:41 2015
HibernationDevice: RESUME=UUID=7ce5b8d0-4dd6-4291-b00f-c06a1b357f94
InstallationDate: Installed on 2015-05-03 (3 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: Dell Inc. Inspiron N5010
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic root=UUID=fe68578b-2d0a-44bf-ab60-93c06a3786b2 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-16-generic N/A
 linux-backports-modules-3.19.0-16-generic N/A
 linux-firmware 1.143
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/19/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.vendor: Dell Inc.
dmi.board.version: A15
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A15
dmi.modalias: dmi:bvnDellInc.:bvrA15:bd07/19/2011:svnDellInc.:pnInspironN5010:pvrA15:rvnDellInc.:rn:rvrA15:cvnDellInc.:ct8:cvrA15:
dmi.product.name: Inspiron N5010
dmi.product.version: A15
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[skt.diaz (skt-diaz)]

what do you mean? can this be fixed?

[penalvch (penalvch)]

skt.diaz, thank you for reporting this and helping make Ubuntu better. Could you please test the latest upstream kernel available from the very top line at the top of the page (the release names are irrelevant for testing, and please do not test the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue.

If the test did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:
kernel-fixed-upstream
kernel-fixed-upstream-X.Y-rcZ

Where XY and Z are numbers corresponding to the kernel version.

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-X.Y-rcZ

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results.

[skt.diaz (skt-diaz)]

i did as you told. The flickering is still there which appears before the ubuntu logo with dots splash screen.

[penalvch (penalvch)]

skt.diaz, the next step is to fully commit bisect from kernel 3.16 to 3.19 in order to identify the last good kernel commit, followed immediately by the first bad one. This will allow for a more expedited analysis of the root cause of your issue. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection ?

Please note, finding adjacent kernel versions is not fully commit bisecting.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[skt.diaz (skt-diaz)]

can you please explain what i have to do basically? do i have to install only 3.16, 3.17, 3.18 and 3.19 ?

[Launchpad Janitor (janitor)]

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