[Bug 32316] New: Severe glitches with KMS + external monitor

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sat Dec 11 05:13:40 PST 2010


           Summary: Severe glitches with KMS + external monitor
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: tim.holy at gmail.com
         QAContact: xorg-team at lists.x.org

Created an attachment (id=41003)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=41003)
Xorg log

First, I'm running Kubuntu Maverick on a Thinkpad T60. I couldn't figure out
how their version numbering of the driver corresponds to yours, but I've
included package information at the bottom of this message.

If I start the laptop allowing KMS and using just the laptop's own display
(1400x1050), then things are by-and-large well. However, if I attach an
external monitor, configure the display, and hit "accept" (at which point it
activates the external monitor), severe graphical glitches start. The most
regular of these is a set of horizontal lines that continually dance across the
screen. I was unable to take a screenshot of them; the files look entirely
normal, even though the display does not. Let me know if a photograph would
help. Against a blue background, many of the lines change from black to white
at somewhere around 2/3 the way horizontally across the screen.

Moreover, when I type a character there is a quick "blip" on the screen that
looks as if graphical elements (either sections of windows or whole windows)
are temporarily being placed in the wrong position. After a fraction of a
second, it goes back to the usual dance of the lines. Switching between windows
causes a more persistent form of this whacky whole-screen shuffling, lasting
perhaps half a second.

Using UMS avoids these glitches. The odd thing is that I don't remember these
glitches being present on the Maverick beta CD, which I tried out some time
ago. (I only just this week upgraded to Maverick on the hard drive.)

This is the version of the radeon driver apparently installed:
$ dpkg -l *radeon*                                                              
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                        Version                     Description
ii  libdrm-radeon1              2.4.21-1ubuntu2.1           Userspace interface
to radeon-specific kernel DRM services -- runtime
ii  radeontool                  1.6.1-1                     utility to control
ATI Radeon backlight functions on laptops
ii  xserver-xorg-video-radeon   1:6.13.1-1ubuntu5           X.Org X server --
AMD/ATI Radeon display driver
un  xserver-xorg-video-radeonhd <none>                      (no description

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