Didn't get any response yet, hence copying LKML for a broader audience.
On 11/04/2011 03:36 PM, Daniel Mack wrote: > I'm facing a bug on a Samsung X20 notebook which features an i915 > chipset (output of 'lspci -v' attached). > > The effect is that setting the backlight to odd values causes the value > to be misinterpreted. Harald Hoyer (cc:) had the same thing on a Netbook > (I don't recall which model it was). > > So this will turn the backlight to full brightness: > > # cat /sys/class/backlight/intel_backlight/max_brightness > 29750 > # echo 29750 > /sys/class/backlight/intel_backlight/brightness > > However, writing 29749 will turn the display backlight off, and 29748 > appears to be the next valid lower value. > > It seems like the IS_PINEVIEW() branch in > drivers/gpu/drm/i915/intel_panel.c:intel_panel_actually_set_backlight() > could do the right thing, but this code is written for an entirely > different model, right? > > I can reproduce this on 3.0 and 3.1 vanilla as well as with the current > mainline git. > > Let me know if there is any patch that I can test. > > > Thanks, > Daniel -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: lspci-v-x20.txt URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20111108/3891ab5d/attachment-0001.txt>
