Hi,
On 18-03-15 22:31, Stepan Bujnak wrote:
Hi, unfortunately I moved to San Francisco and left my old laptop at
home, so I cannot debug the issue anymore. As far as I remember
correctly, the problem was that I only had the intel_backlight interface
which did not work as expected (value always on top, the buttons did not
work, neither did writing the value manually). Once I blacklisted the
intel_backlight using the patch I submitted I was able to get the
backlight working.
However, I'm reading that you've got fix for the problem and my patch
conflicts with it? If this is the case, please replace my code with your
fix, and once I get back home (April 28th) we can continue debugging the
issue using my laptop.
Ok, I'll do a patch with what I believe is a more complete fix, and then
I'll ask Be to test it, and if that goes well send it upstream.
Regards,
Hams
Best wishes,
Stepan
On Wed, Mar 18, 2015, at 06:12 AM, Hans de Goede wrote:
Hi Stepan,
I'm mailing you because you are the author of:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a11d342f
I've been debugging the same problem together with a Fedora user:
https://bugzilla.redhat.com/show_bug.cgi?id=1187004
And for him your fix does not work, before your fix landed we already
came to the conclusion that to fix this we need to disable both the
acpi_video backlight interface as well as the ideapad-laptop interface.
Your patch only disables the acpi_video backlight interface (and as
a side effect actually enables the ideapad-laptop interface).
I assume that you've a working backlight setup on your Lenovo Ideapad
Z570,
can you please do:
ls /sys/class/backlight
And let us know which interfaces show up there. Either you do have a
working
ideapad_laptop interface, or you only get intel_backlight and for some
reason
ideapad_laptop is not loading on your system (not enabled in your kernel
config,
or blacklisted?).
If you only have intel_backlight then that explains why things are not
working
for Be (the author of the Fedora bugreport), if you do have an
ideapad_laptop
interface and that does work for you, then it seems that not all
Lenovo Ideapad Z570-s are created equal. In that case can you please
blacklist
the ideapad-laptop module, reboot and see if things still work for you
when
using intel_backlight to control the backlight? Once we've a confirmation
that either you are already using intel_backlight, or that
intel_backlight also
works on your Ideapad, then I'll write a patch to replace yours which
leaves
only intel_backlight even if the ideapad-laptop driver gets loaded.
Thanks & Regards,
Hans
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