On 23 May 2014 02:34, Aaron Lu <aaron.lu@xxxxxxxxx> wrote: > On 05/21/2014 09:02 PM, Lewis Toohey wrote: >> Hi Aaron >> >> I followed your instructions and can report some limited success. I >> have two interfaces listed in /sys/class/backlight namely: >> acpi_video0 radeon_bl0 >> >> max_brightness for acpi_video0 is 11. Echo-ing new values to >> brightness appears to have no effect. >> >> max_brightness for radeon_bl0 is 255. Echo-ing new values to >> brightness does adjust the screen brightness as you would expect. >> >> Results are the same on both battery and powered. >> >> I hope that is useful. > > I think Hans' patchset should solve your problem, can you please give it > a try? You will need to pass the video.use_native_backlight=1 to kernel > cmdline when testing, thanks. > > [PATCH resend 0/4] Make video.use_native_backlight=1 work properly with nouveau > http://www.spinics.net/lists/dri-devel/msg59941.html > > -Aaron Aaron Thank you for this. Unfortunately I am going to have to ask you for a bit of help here as I am now, officially, "out of my depth". I appreciate this is a pain as you will have to take time explaining it to me and I apologise for that. I have figured out how to pass the kernel command line argument, this is not an issue. I have located the patch you refer to here: https://bugzilla.redhat.com/attachment.cgi?id=894577 (which I believe is correct) but I cannot figure out how to apply it. I copied and pasted that text into a file in my home directory and called it "backlight.diff". When I ran "patch < backlight.diff" it complains that it cannot find the file to patch. I am not familiar with the syntax of a patch file so I can't work out what's going wrong. I thought that the diff file might need to be placed relative to the path referred to within it but "locate nouveau_backlight.c" returns no results so I don't know where to put it. Can you advise? Very grateful for your continued help and patience -- Lewis Lewis@xxxxxxxxxxxx 0782 588 4158 -- 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
