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On 2016-06-18T06:42:44+00:00 Vincent Bernat wrote:
Created attachment 124584
xorg.log
Hey!
After switching from intel to modesetting, xbacklight doesn't work
anymore:
$ xbacklight = 20
No outputs have backlight property
However, a backlight control is present in sysfs:
/sys/class/backlight/intel_backlight
In Debian:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=824987
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/4
On 2016-06-24T09:38:09+00:00 Peter B. Jørgensen wrote:
I have the same problem running Arch linux.
xbacklight works with the xf86-video-intel driver, but not without it, even
though /sys/class/backlight/intel_backlight is still present.
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/5
On 2016-07-07T15:20:07+00:00 Timabraldes wrote:
I'm not sure what the etiquette is about "me too" comments in this
Bugzilla instance, but I see the same behavior on a Lenovo Thinkpad
T440s: /sys/class/backlight/intel_backlight is present but xbacklight
simply says "No outputs have backlight property" when I try to run it. I
have not installed the intel driver so I'm using modesetting by default.
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/6
On 2016-07-29T07:17:30+00:00 rubik wrote:
Experiencing the same problem. For me it's a real problem because the intel
driver freezes constantly, so my only option is modesetting.
Is there something I can do to help?
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/9
On 2016-08-03T16:09:21+00:00 Martin-peres-n wrote:
Thanks for the bug report, I will be looking it starting from today.
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/10
On 2016-08-04T06:27:05+00:00 Jani-nikula wrote:
IIUC xf86-video-intel provides the backlight property itself; such a
property is not supplied by the kernel.
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/11
On 2016-08-04T14:46:03+00:00 Martin-peres-n wrote:
(In reply to Jani Nikula from comment #5)
> IIUC xf86-video-intel provides the backlight property itself; such a
> property is not supplied by the kernel.
Indeed. Here is a relevant thread:
https://lists.freedesktop.org/archives/dri-
devel/2014-September/thread.html#67984
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/12
On 2016-08-23T10:38:51+00:00 Timo Aaltonen wrote:
so is that set of patches going to be revived soon?
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/13
On 2016-09-10T19:42:26+00:00 Nico-freedesktop-org wrote:
I wonder if anyone of the developers is reading here at all?
The only reason not to use the modesetting driver is the missing
backlight capability - as it is faster and more reliable than the intel
driver (for intel hardware!).
Reply at: https://bugs.launchpad.net/ubuntu/+source/xorg-
server/+bug/1440891/comments/14
On 2016-09-12T15:20:26+00:00 Eero-t-tamminen wrote:
(In reply to nico-freedesktop.org from comment #8)
> I wonder if anyone of the developers is reading here at all?
Martin's soon back from vacation.
I don't see Jani on the CC, but if this needs new API from kernel, bug
about that should be linked here. Is there one?
> The only reason not to use the modesetting driver is the missing backlight
> capability - as it is faster and more reliable than the intel driver (for
> intel hardware!).
You didn't mention in which use-case, on which distro and with which
exact HW you've compared modesetting and Intel DDX performance, but in
our tests Intel DDX has been somewhat faster on average. As to
reliability, there have been issues with DRI3, but those have been fixed
in X libraries, Mesa, Intel DDX etc. Mainly you need to use new enough
(full) stack.
Reply at: http
