Pivot causes missing single line on screen

Bug #1070883 reported by pdknsk on 2012-10-24
This bug affects 2 people
Affects Status Importance Assigned to Milestone
fglrx-installer (Ubuntu)

Bug Description

Description: Ubuntu 12.10
Release: 12.10

fglrx-amdcccle-updates 2:9.000-0ubuntu3
fglrx-updates 2:9.000-0ubuntu3

When using pivot (rotated screen), a single line exactly in the middle of the screen is missing, which is especially noticeable with text. It's as if the driver tries to render the contents of the screen on a canvas which is 1px less wide than the screen, causing it to remove a single line. When you take a window, like the browser, and move it horizontally on the screen, this effect can be noticed very easily.

The resolution is correct though, the screen is reported as "DFP1 connected 900x1600+0+0 left" by xrandr.

It only occurs with fglrx, not with the open-source radeon driver.

The cursor is not affected by this problem.

I know that Ubuntu maintainers have no means to fix this (unless it's a misconfiguration), but maybe the maintainer can report this problem to AMD.

Please note that "ubuntu-bug fglrx-installer" doesn't work so I've just attached the relevant log file.

pdknsk (pdknsk) wrote :
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in fglrx-installer (Ubuntu):
status: New → Confirmed
The Fiddler (stapostol) wrote :

I've had this issue since at least fglrx 11.4.

mglb (mglb) wrote :

Workaround - change the screen size to (Width+1)x(Height), e.g. for 1200x1920:
xrandr --fb 1201x1920

pdknsk (pdknsk) wrote :

Thanks, it works. It does also reduce the width by 1px effectively, but it's better than a missing line in the middle of the screen.

In case anyone with the same problem wants to make this permanent.

sudo tee /etc/X11/Xsession.d/45custom_xrandr-settings << EOF
xrandr --fb 1201x1920

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