Messages in this thread | | | Date | Sat, 12 Jan 2013 13:42:31 +0100 | Subject | Re: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression? | From | Daniel Vetter <> |
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On Sat, Jan 12, 2013 at 12:22 PM, Fabio Coatti <fabio.coatti@gmail.com> wrote: > I'm seeing the same behaviour on 3.7.2; even > echo "NN" > brightness has no effect. > I've tried to look at changes between 3.6.11 and 3.7.2 but probably > this is beyond my skills ;)
If the regression is with the acpi_video backlight, then it's very likely not a bug in drm/i915. Quickest way to figure that out is to do a git bisect between 3.6 and 3.7, my favourite howto is: http://www.reactivated.net/weblog/archives/2006/01/using-git-bisect-to-find-buggy-kernel-patches/
Cheers, Daniel
> 2012/12/20 Fabio Coatti <fabio.coatti@gmail.com>: >> In data mercoledì 19 dicembre 2012 17:10:29, hai scritto: >>> ----- Original Message ----- >>> >>> > From: "Fabio Coatti" <fabio.coatti@gmail.com> >>> > To: linux-kernel@vger.kernel.org >>> > Sent: Wednesday, 19 December, 2012 5:01:30 PM >>> > Subject: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression? >>> > >>> > Hi, >>> > I'm testing kernels 3.7.X vs 3.6.11 on an HP Folio 9470m machine, >>> > i915 >>> > driver for a VGA compatible controller: Intel Corporation 3rd Gen >>> > Core >>> > processor Graphics Controller (rev 09) 8086:0166 >>> > >>> > With 3.6.11, the brightness can be correctly set using fn+f9/10: kde >>> > shows the bar and brightness changes. >>> > >>> > With 3.7.1 kde shows the percentage bar and >>> > /sys/class/backlight/acpi_video0/brightness is updated, but the >>> > screen >>> > brightness does not changes. >>> >>> I had a similar problem with my Dell laptop and i915/acpi... >>> >>> Is there another acpi_video? device? In my case two showed up in 3.7 >>> whereas in 3.6 there was one. In 3.7 it was controlling the wrong one >>> apparently. >> >> Well, this seems not to be the case, I have only one acpi_video: >> >> calvin ~ # ls -l /sys/class/backlight/ >> totale 0 >> lrwxrwxrwx 1 root root 0 20 dic 09.20 acpi_video0 -> >> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 >> >> calvin ~ # ls -l /sys/devices/pci0000:00/0000:00:02.0/backlight >> totale 0 >> drwxr-xr-x 3 root root 0 20 dic 09.20 acpi_video0 >> >> >> >> -- >> Fabio > > > > -- > Fabio
-- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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