On 02/25/13 10:30, John Baldwin wrote: > > Is there a better place to "correct" the ACPI_PATH that gets stored in > vgapci's ivar? Is there already a tunable I can use to fix this? > vgapci's ivar is set by the PCI address. Do you have multiple vgapci devices? > No, just one. I think that the DSDT is very creative on recent Lenovos (read: broken). There are multiple video devices defined, with "functional" calls that nonetheless don't work to actually do anything. The acpi_get_handle() call in acpi_video returns a handle that has no active outputs and doesn't have any control over the brightness. The other path can control brightness. Here's a related discussion on Linux, I'm not sure how much applies other than the situation discussed: http://comments.gmane.org/gmane.linux.acpi.devel/57228 The same thing happens on AGP thinkpads, I believe, based on Mitsuru Iwasaki's comment a long time ago to an X220 thread. MattReceived on Tue Feb 26 2013 - 00:54:43 UTC
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