Public bug reported:
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: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
** Attachment added: "TTY-distorted.ogg"
https://bugs.launchpad.net/bugs/1325940/+attachment/4124733/+files/TTY-distorted.ogg
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1325940
Title:
Desktop sometimes comes up with undisplayable screen resolution
Status in “xserver-xorg-video-ati” package in Ubuntu:
New
Bug description:
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)
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1325940/+subscriptions
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