Messages in this thread | | | Date | Mon, 02 Nov 2009 18:06:26 -0600 | From | Robert Hancock <> | Subject | Re: Faulty MTRR setups in Toshiba laptops crash video drivers |
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On 11/02/2009 10:28 AM, Mehmet Giritli wrote: > Hello all, > > On some laptops using ATI 3650HD radeon chipsets and 4GB ram (and may be > others as well), it is impossible to start any xserver due to (faulty?) > mtrr setups on the machine. The computer locks up or just gives an > unresponsive black screen. There are various drivers for radeon cards > and the crash occurs in all of these drivers in the very same way! > > This bug seems to occur mostly on Toshiba laptops with ATI graphic > cards. For some people, CONFIG_MTRR_SANITIZER seemed to cure the issue > but made no difference for many others like me. > > RadeonHD people seem to have problems in understanding the nature of > this bug. Please have a look at the threads: > > http://lists.opensuse.org/radeonhd/2009-05/msg00040.html > > and, > > http://bugs.freedesktop.org/show_bug.cgi?id=20645 > > for problem reports and dev responses. RadeonHD devs suggest that some > laptops have weird mtrr setups and this must be fixed in the kernel code > and not the driver code.
Unfortunately I don't see enough details to be able to tell what lead them to this conclusion. Can you post the output of:
lspci -vv cat /proc/mtrr
> > Currently, the only way that could make the driver work is to reduce the > 4GB ram to 2GB. > > dmesg from my affected machine when it has 4GB ram installed can be > found here: > > http://bugzilla.kernel.org/attachment.cgi?id=22856 > > Also, look at the report here: > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/341681 > > in order to see how many people are being affected by this bug! > > Kind Regards, > M. Giritli > >
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