On 12/20/2013 04:27 PM, Geert Uytterhoeven wrote:

On Fri, Dec 20, 2013 at 3:24 PM, Sebastian Andrzej Siewior
[off-list ref] wrote:

quoted

If the primary GPU driver has been loaded _after_ system as a module
then this logo memory is no longer valid.
Managed to crash the system by booting a box without a GPU and then
hotpluggin => BOOM.

Which GPU driver is this?

i915.

drivers/video/fbmem.c:fb_prepare_logo() has protection against this:

        if (info->flags & FBINFO_MISC_TILEBLITTING ||
            info->flags & FBINFO_MODULE)
                return 0;

but gpu driver is built-in. I just add PCI device at run-time. The same
thing should happen if you go to sysfs and remove the PCI device and
then do
  echo 1 > /sys/bus/pci/rescan

Sebastian