Bug#602009: linux-image-2.6.36-trunk-amd64: i915.powersave option is not respected in 2.6.36
Hello,
On Tue, Nov 2, 2010 at 1:10 AM, Fernando Lemos <fernandotcl@gmail.com> wrote:
> Thanks for your prompt response. Done, it's bug #31311:
>
> https://bugs.freedesktop.org/show_bug.cgi?id=31311
Chris Wilson's reply shed some light on this and I now understand
what's going on. I commented up i915.powersave=0 to test if #580601
was gone in 2.6.36, and that made into the initrd, as I found out
after examining it. Running update-initramfs -k all -u solved the
issue.
In 2.6.36, as Chris Wilson stated,
/sys/modules/i915/parameters/powersave is 0400. I'm led to believe
that at some point in initialization, after the root filesystem is
mounted, modprobe goes over /etc/modprobe.d again to reset the
options. This might be why leaving i915.powersave=0 commented out in
the initrd worked before 2.6.36. If this is the case, then it might be
nice to have the commit mentioned in the f.d.o bug report backported,
perhaps. It could also be that my other initrds simply didn't have
that option commented out.
Anyways, the issue is now solved for me:
fernando@vostro:~$ sudo cat /sys/module/i915/parameters/powersave
0
fernando@vostro:~$ uname -a
Linux vostro 2.6.36-trunk-amd64 #1 SMP Wed Oct 27 14:28:29 UTC 2010
x86_64 GNU/Linux
fernando@vostro:~$
Please feel free to close/archive/invalidate this bug report. Sorry
for any inconvenience and thanks for your time.
Regards,
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