Bug#884846: xserver-xorg-video-radeon: xrandr hang on resolution setup after xorg has been started

Michel Dänzer michel at daenzer.net
Wed Dec 20 14:04:51 UTC 2017

On 2017-12-20 12:17 PM, Angelo Dureghello wrote:
> Package: xserver-xorg-video-radeon
> Version: 1:7.8.0-1+b1
> Severity: grave
> Justification: renders package unusable

"renders the package unusable" in this context means the package cannot
be used for its intended purpose at all by anyone, which isn't the case.

> Dear Maintainer,
> In xserver-xorg-video-radeon v. i am observing the following issue:
> after xorg has been started, and openbox-session is called, xrandr seems to
> hang leaving interface with mouse pointer only, but not usable.
> The line causing the issue is :
> (sleep 1s && xrandr --output VGA-0 --off --output DVI-0 --primary --mode
> 2560x1440 --output HDMI-0 --mode 1920x1080 --right-of DVI-0) &

When it hangs, can you attach gdb to the Xorg process and get a
backtrace? See
https://www.x.org/wiki/Development/Documentation/ServerDebugging/ for
detailed information about how this can be done. Make sure the
xserver-xorg-core-dbgsym and xserver-xorg-video-radeon-dbg packages are

> If i roll back to v. version all works fine as usual and expected.

Can you use git bisect to determine which change introduced the problem?

Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer

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