Lockups When Logging Out
dan at entropy.homelinux.org
Sun Jun 4 22:14:38 PDT 2006
David M. Carney wrote:
> Using xorg 7.0 on Ubuntu Linux 6.06. Video device (on board) is Radeon
> XPRESS 200. It shares system memory.
> When I use the fglrx (ATi 3d accelerated driver) I get hard lockups when
> I try to terminate my xsession. Screen goes black and the keyboard is
> unresponsive as in I cannot change the Num Lock status, etc.
> ctrl-alt-backspace does nothing. If I try to use ctrl-alt-backspace from
> an X session, I get the lockup, also.
> If I change the the non-3d accelerated ATi driver, the lockups go away
> and all is well, excepting of course I no longer have 3d acceleration.
Your one-and-only 'fix' is to not use ATI's drivers. As you've
discovered, they lock the system hard when exiting X or dropping to a
You can use xorg's 2D driver for the XPRESS chips. There is no 3D
support. If you want 3D support, you'll just have to live with lockups.
What I do is compile my kernel with the 'magic SysRq key' option
enabled, and then before I exit X or drop to a console, I hit the keys:
ALT SysRq S
ALT SysRq U
ALT SysRq B
( Son Uva Bitch ). ie hold down the ALT and SysRq keys, and hit S, then
U, then B.
This leaves the disk in a sane state so if the system locks, I won't
loose all my data when I cut the power and boot up again.
ATI claimed that the very latest driver update has fixed these lockups,
but it's still happening on mine ( X700 mobility ).
More information about the xorg