touch-packages team mailing list archive

[Launchpad Bug Tracker <1325940@xxxxxxxxxxxxxxxxxx>]

You have been subscribed to a public bug:

Hello,

the PC from which I'm sending this report sometimes fails to boot into
the desktop properly (which desktop environment doesn't seem to matter).
In the failure case the following happens:

- The Plymouth Ubuntu splash gets displayed, but it looks distorted.
Flickering horizontal artifacts are shown all over the screen, it looks
a bit like a CRT Television with low signal.

- When the desktop is loaded (via autologin), one can see short glimpses
of its wallpaper, but after a few second the screen becomes black and
remains that way. The monitor _does_ seem to receive a signal though.

- It is possible to switch to TTYs and to use them, but they show
similar artifacts like the Plymouth logo.

- If I query the display information on the monitor's OSD when the
screen is distorted, it reports a resolution of 1681x1050 or 1683x1050,
which is 1-3 pixel bigger than the native horizontal resolution of the
22" LCD screen.

Switching between different resolutions via entering 'xrandr --size
1024x768' blindly, followed by 'xrandr --size 1680x1050' brings up the
native resolution properly.

This does not happen on every boot, only in ~10-15% of the cases. I was
not able to find any pattern so far in the occurence of this bug. The
only thing I observed is that it _never_ happens when Windows XP is
started, thus my assumption is that the bug is related to the xserver-
xorg-video-radeon driver.

I tried to specify the correct resolution explicitly on the kernel
command line(adding video=DVI-I-1:1680x1050 ) but this has no positive
effect.

The monitor is connected via DVI.

Below is a video attached that tries to show how the TTYs look when this
bug occurs. Notice the abnormal blue lines, which are constantly
flickering.

Kind regards,
Jan

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-video-radeon 1:7.3.0-1ubuntu3.1
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
Uname: Linux 3.13.0-27-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Tue Jun  3 13:23:38 2014
InstallationDate: Installed on 2014-04-22 (41 days ago)
InstallationMedia: Lubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
SourcePackage: xserver-xorg-video-ati
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug trusty
-- 
Desktop sometimes comes up with undisplayable screen resolution
https://bugs.launchpad.net/bugs/1325940
You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu.