In my situation this is something I found in the logs.
I analyzed the logs and compared it to a normal log and besides the similar stack dump I see one significant difference in the problematic log is this:
[drm] radeon: 3584M of VRAM memory ready
[drm] radeon: 512M of GTT memory ready.
whereas in the normal log:
[drm] radeon: 512M of VRAM memory ready
[drm] radeon: 512M of GTT memory ready.
The laptop has only 4GB RAM and ATI is supposed to have only 512MB.
In my situation this is something I found in the logs.
I analyzed the logs and compared it to a normal log and besides the similar stack dump I see one significant difference in the problematic log is this:
[drm] radeon: 3584M of VRAM memory ready
[drm] radeon: 512M of GTT memory ready.
whereas in the normal log:
[drm] radeon: 512M of VRAM memory ready
[drm] radeon: 512M of GTT memory ready.
The laptop has only 4GB RAM and ATI is supposed to have only 512MB.
I have attached the relevant part of the log