intel_backlight works as expected for me running kernel-3.18.8-201.fc21.x86_64 with ideapad_backlight blacklisted. On 03/18/2015 04:31 PM, 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. > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
