System Freeze on Switch user

[Odur]

VT switching works just fine. Restarting the X server is what locks up the machine. (Press CTRL+ALT+Backspace in X. Viola, bye bye system. Needs hard reset.)

I can restart X-server just fine, and switch VT's. The hard lock only happens when I start another X-session.

[duffster]

I can restart X-server just fine, and switch VT's. The hard lock only happens when I start another X-session.

Same here. Restarting X is fine. Starting a second X session causes total machine lockup.
I used to get lockup restarting X, but that was fixed a few releases ago.

[gururise]

User switching is what causes Hard Lock Hell for me using fglrx. I haven't tested VT Switching. This is 100% reproducible on a ATI 4670 card & Ubuntu 8.04 LTS (w/latest updates):

1. Log in as a user to default desktop.
2. Switch to a different user using the Fast User Switch agent.
3. Log in as the new user.
* HARD LOCK *

Also, switching users from the screensaver will also lock the system. Sometimes 1 user switch will work, but then trying to switch back to the original user will HARD LOCK the system.

[Wintervenom]

For me, even restarting the X server results in a backtrace and the system will eventually lock up.

[duffster]

Bridgeman,

Any update on investigating this?

[monomakh]

User switching is what causes Hard Lock Hell for me using fglrx. I haven't tested VT Switching. This is 100% reproducible on a ATI 4670 card & Ubuntu 8.04 LTS (w/latest updates):

1. Log in as a user to default desktop.
2. Switch to a different user using the Fast User Switch agent.
3. Log in as the new user.
* HARD LOCK *

Also, switching users from the screensaver will also lock the system. Sometimes 1 user switch will work, but then trying to switch back to the original user will HARD LOCK the system.

This is 100% reproducible on a ATI HD 3850 (agp) & opensuse 11.1 (w/latest updates)

[gururise]

This is 100% reproducible on a ATI HD 3850 (agp) & opensuse 11.1 (w/latest updates)

Just want to mention that this problem is reproducible with both Catalyst (fglrx) 8.12 and the new 9.1! I am running 64-bit Ubuntu 8.04LTS if that helps... My multi-user linux is effectively a single user system with fglrx.

[niella]

Just want to mention that this problem is reproducible with both Catalyst (fglrx) 8.12 and the new 9.1! I am running 64-bit Ubuntu 8.04LTS if that helps... My multi-user linux is effectively a single user system with fglrx.

Same symptoms on OpenSUSE 11.1 with HD3650 card, even just logging out of X will cause a hard lock.

Niel

[EyeOfRA]

Same sysmptoms on OpenSuSE 11.0 with HD3450 card. No problems on logging out, but immediate freeze when trying to start a second X-Session.

Interesting thing: when I used the built in HD3200 from the 780 Chipset this did not occur.

[Wintervenom]

The solution at/near the end of this thread solved my problem, maybe they will help you guys, too. (http://bbs.archlinux.org/viewtopic.php?id=57084&p=3)