[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1057532
Title:
Monitor goes black ("no signal") after Grub, comes back to life when X
starts
Status in “linux” package in Ubuntu:
Expired
Bug description:
After selecting an entry from the Grub menu and booting starts, the screen
goes blank, and the monitor displays "no signal". When booting ends and X
starts up, the screen comes back to life, and the LightDM login screen appears.
I'm using a Radeon HD 6850 with the opensource driver.
Kernel version: 3.5.0-15.23-generic 3.5.4
This is a regression, as the issue wasn't present with an earlier 3.5 kernel.
When I updated recently, I updated to kernel version 15.22, which exposed the
issue. Updating to a newer version (.23) did nothing to fix the issue.
Update: Installing the kernels did not fix the issue either:
3.5.0-16.24, 3.5.0-16.25
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-13-generic 3.5.0-13.14
3.5.0-14.15, 16, 17, 18, 19
3.5.0-15.20, 21, 22, 23, 24
3.5.0-16.25
ProcVersionSignature: Ubuntu 3.5.0-15.23-generic 3.5.4
Uname: Linux 3.5.0-15-generic x86_64
ApportVersion: 2.5.2-0ubuntu4
Architecture: amd64
Date: Thu Sep 27 15:25:08 2012
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20120913)
ProcFB: 0 radeondrmfb
SourcePackage: linux
Update: Apparently the Ubuntu kernels can't handle the "vt.handoff=7" option
properly, which causes the black screen.
See my comment below for how to fix it:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1057532/comments/38
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