Public bug reported:
Under Ubuntu 8.10 with the open source radeon driver (used per default
after installation), the resolution ot the connected display is not
used. Instead it uses 1024x768. Using xrandr, I can only change to
lower resolutions.
This is strange, since looking through Xorg.0.log (attached), it
correctly reads out the display to be 1680x1050.
The display is connected to my main-board's HDMI connector via a HDMI-
DVI adapter cable.
$ lspci -d 1002:791f
01:05.0 VGA compatible controller: ATI Technologies Inc RS690M [Radeon X1200
Series]
Creating a xorg.conf to make it work is somewhat non-trivial. With the
following settings:
[..]
SubSection "Display"
Depth 24
Modes "1680x1050"
EndSubSection
[..]
HorizSync 30.0 - 75.0
VertRefresh 50.0 - 70.0
[..]
gdm starts at the right resolution of 1680x1050, but only uses a part of
the screen at the left, top side (maybe exactly 1280x800 pixels? not
sure). After logging in, the gnome panel and menu bar, also only use
that much of the screen, although I am able to drag and resize windows
to use more of the screen space. This looks like a variant of Bug #
200805.
Only after manually adding
Option "PanelSize" "1680x1050"
to the "Device" section, I get the correct screen resolution.
The proprietary fglrx driver gets the resolution right, which points to
a purely software-related issue.
I just tried to report the bug via 'ubuntu-bug -p xserver-xorg-video-
ati' as recommended, but only got an "Error: Page not found" when it
tried to submit the collected data to launchpad.
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
** Tags: ati radeon resolution
--
ATI RS690M: screen size not detected, needs obscure xorg.conf change
https://bugs.launchpad.net/bugs/310870
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