Public bug reported:
Binary package hint: xserver-xorg-video-radeon
I'm using Ubuntu 8.10 with the open source Radeon driver (used by
default after installation). By default the driver doesn't detect my
display's size and runs at 1024x768. In this mode everything works
fine. If I add 'Option "PanelSize" "1680x1050"' to my xorg.conf and
restart, the driver uses the display's correct native resolution.
At the higher resolution, the screen now randomly blanks out for a
second. On an idle system these blanks are rather seldom, mabye once per
5 minutes. If I enter a 3D game, such as ppracer, these blanks occur
much more frequently, many times per minute.
This looks like the 'display buffer underflow' problem described in 'man
radeon'. Unfortunately setting option "DisplayPriority" to "HIGH" or
"BIOS" doesn't help.
$ lspci -d 1002:791f
01:05.0 VGA compatible controller: ATI Technologies Inc RS690M [Radeon X1200
Series]
snipset from 'apt-cache policy xserver-xorg-video-radeon':
Installed: 1:6.9.0+git20081003.f9826a56-0ubuntu2
I'm using a 1680x1050 display connected digitally via my board's HDMI
output. I only have a single 2GB SO-DIMM DDR2-800 RAM module on my
mainboard, which is used for the shared video RAM.
Copy of Xorg.0.log attached.
Using the proprietary fglrx driver, I don't see those blanks, which
should rule out a hardware problem.
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
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ATI RS690M: screen randomly blanks for short times
https://bugs.launchpad.net/bugs/310864
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