https://bugs.freedesktop.org/show_bug.cgi?id=27430
Summary: distorted display with Dell U2711 monitor with
xserver-xorg-video-ati
Product: xorg
Version: 7.5
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: minor
Priority: medium
Component: Driver/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
Created an attachment (id=34624)
--> (https://bugs.freedesktop.org/attachment.cgi?id=34624)
lspci -vvnn output
Gets distorted display with a Dell U2711 using the KMS enabled xorg server that
comes with Ubuntu Lucid (10.04).
The distortion is such that fonts are rendered almost unreadable (beside that
the outline is distorted, they have a heavy red tint to them). It seems like
that everything gets "overlayed" with a kind of "sawtooth" like pattern which
distort everyhing, including fonts, borders on windows and edges in images and
such.
The distortion is not present in screenshots.
The distortion seems to be there "all the way" from boot and up. That is the
"ubuntu logo" with "progress bar" displayed during boot also displays the same
distortion.
When using a different monitor, that is a Dell 2005FPW monitor, the distortion
is all gone. (The U2711 uses dual channel DVI - 2560x1440 resolution, while the
2005FPW monitor uses single channel - 1680x1050 resoultion.)
The ATI fglrx driver (ver. 2:8.721-0ubuntu7) works fine with the U2711 monitor
(but calculates the DPI wrong - gets 96 while it should be 109 for this
monitor).
The videocard is a Radeon HD 4550 card (RV710 chip).
Have tested with the xserver-xorg-video-ati driver that comes with Ubuntu
Lucid, the driver from ppa:xorg-edgers/ppa (ver.
1:6.12.192+git20100401.6baa96c4-0ubuntu0sarvatt) and with "bleeding edge"
(buildt according to instructions given at
http://www.x.org/wiki/radeonBuildHowTo).
>From the general discussion around such issues and the KernelModeSettings found
on the net, I have gotten the understanding that parts of the Xorg driver code
now resides in the kernel and it could therefore be that the problem resides
there and not in the xserver-xorg-video-ati/radeon driver. Have used the
standard kernel (currently 2.6.32-19) that comes with Ubuntu Lucid all the way,
as I have not found out how to update the KMS parts in the kernel with newer
versions (pointers are most welcome). Tried with a 2.6.33 kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.33/, but this kernel gave no
change (is from february and the KMS part might therefore not be up to date).
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