Messages in this thread | | | Date | Mon, 4 Mar 2013 18:49:43 +0100 | Subject | Re: i915 black screen introduced by ACPI changes | From | Daniel Vetter <> |
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On Mon, Mar 4, 2013 at 6:11 PM, Chris Li <lkml@chrisli.org> wrote: > To recap, the black screen first show up after the ACPI change to use widows 8 > string. The i915_setmode function did not crash. The printk output > from that function seems the same as the one that is in 3.6 kernel. > I also include the 3.6 and 3.7 kernel dmesg. The black screen is 100% > reproducible. > > Any suggestion how to further debug this i9515 black screen problem? > I really want to get it fixed.
Sorry for missing out on this one, I'll add a few more mailing lists to.
Backlight issues themselves are usually a pain. I've looked through your debug dmesg and there doesn't seem to be anything bad going on.
Two things to test: - Can you please check whether any of the backlight drivers in /sys/class/backlight does anything? You need to frob the brightness file. Please also list all the drivers you have. - Please grab the lates git of intel-gpu-tools and attach the output of intel_reg_dumper for both a working and a broken kernel. The git tree is at:
http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/
Since backlight bugs usually take a lot of poking to figure out it might be good to keep things together in a bugzilla report. bugs.freedesktop.org, DRI -> DRM (Intel) is the preferred location, please file a report there and attach the dump files (and the debug dmesg logs we've gathered already).
Thanks, Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
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