Red Hat Bugzilla – Bug 600624
noise on display under certain conditions
Last modified: 2018-04-11 04:12:58 EDT
Description of problem:
For my laptop which has a 1920x1200 panel connected by LVDS and driven by a radeon chipset, when using Fedora13 with a compositing manager and displaying video, noise is occasionally seen on the display. On older hardware (Intel i740) I was able to get this sort of noise when driving the DAC beyond its rated speed, other than that I can only describe it as small white horizontal lines about 60-100 pixels in length (I'm guessing) and one pixel high. They appear anywhere on the screen.
Hardware: (from lspci)
01:00.0 VGA compatible controller: ATI Technologies Inc M22 [Mobility Radeon X300] (prog-if 00 [VGA controller])
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 4096 x 4096
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS connected 1920x1200+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
Using gnome shell preview, viewing video with flash plugin in browsers
Version-Release number of selected component (if applicable):
Intermittent noise most noticeable when display is busy with video and flash adverts.
Steps to Reproduce:
1.enable compositing manager
noise on screen
noise free screen
Thanks for the bug report. We have reviewed the information you have provided above, and there is some additional information we require that will be helpful in our diagnosis of this issue.
Please add drm.debug=0x04 to the kernel command line, restart computer, and attach
* your X server config file (/etc/X11/xorg.conf, if available),
* X server log file (/var/log/Xorg.*.log)
* output of the dmesg command, and
* system log (/var/log/messages)
to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 421947 [details]
output of dmesg
Created attachment 421948 [details]
copy of /var/log/messages
Created attachment 421949 [details]
copy of /var/log/Xorg.0.log.old
This has a segfault towards the end, although I don't think that is relevant to the problem.
Created attachment 421950 [details]
copy of /var/log/Xorg.0.log
[root@pricey ~]# cat /proc/cmdline
ro root=/dev/mapper/vg_pricey-lv_root rhgb quiet LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=uk rd_plytheme=charge drm.debug=0x04
There is no /etc/X11/xorg.conf
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For the record, I think this is fixed, I haven't seen the noise for a while and the display is now failing in other ways (hardware failure)