[Bug 65377] New: Backlight control via /sys/class/backlight/radeon_bl0 not working

[Bug 65377] New: Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 1212 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

          Priority: medium
            Bug ID: 65377
          Assignee: dri-devel@lists.freedesktop.org
           Summary: Backlight control via /sys/class/backlight/radeon_bl0
                    not working
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: bastian.triller@gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

This is a Macbook pro 8,2 with an Intel HD Graphics 3000 [8086:0116] and an AMD
Radeon HD 6750M [1002:6741].
The backlight interface in /sys/class/backlight/radeon_bl0 does not work.
Echoing to "brightness" does not change the brightness of the Monitor. There is
also an apple_gmux interface, which works though.
I've bound xbacklight to the brightness keys to control the brightness, but it
looks like it's confused about which interface it should use:
$ xbacklight -inc 5
No outputs have backlight property

When I disable the Radeon card on boot and use the Intel card, xbacklight
works.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 2523 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 325 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> ---
If you are booting in EFI mode, does it work if you boot in legacy bios mode? 
Since it's a mac, it probably requires some mac specific hack.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 1126 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 537 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #2 from Bastian Triller <bastian.triller@gmail.com> ---
(In reply to comment #1)
> If you are booting in EFI mode, does it work if you boot in legacy bios
> mode?  Since it's a mac, it probably requires some mac specific hack.

I'm booting via EFI stub. I'm not sure how to boot the bios emulation mode. Is
it possible to plug in a usb stick with a "normal" live system to boot in
emulation mode?

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 1434 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 398 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #3 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #2)
> I'm booting via EFI stub. I'm not sure how to boot the bios emulation mode.
> Is it possible to plug in a usb stick with a "normal" live system to boot in
> emulation mode?

I'm not sure.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 1285 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 450 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #4 from Henri Verbeet <hverbeet@gmail.com> ---
I think it depends a bit on the specific model, but many Macs will only boot
EFI from USB. Refind (http://www.rodsbooks.com/refind/index.html) is
potentially a way around that, although I'm not entirely sure if that counts as
booting in EFI mode or in BIOS mode.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 1312 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 321 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #5 from Alex Deucher <agd5f@yahoo.com> ---
I believe the only way to control the backlight on the macs with multiple GPUs
is via the gmux driver.  Seems to be a mac specific thing.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 1122 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 448 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #6 from Bastian Triller <bastian.triller@gmail.com> ---
Booting a dd'ed image did not work. I'll have to find a disc to test it.

Looking into the xbacklight I saw that xbacklight tries to find a Backlught
property on the output. xrandr lists this property on the intel output, but not
on the radeon output.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 1262 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 334 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #7 from Bastian Triller <bastian.triller@gmail.com> ---
The problem also exists if I boot in bios mode.

I didn't mention that, when using the intel card there only is the apple_gmux
interface.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 1148 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 386 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

--- Comment #8 from Alex Deucher <agd5f@yahoo.com> ---
Created attachment 80624
  --> https://bugs.freedesktop.org/attachment.cgi?id=80624&action=edit
don't register a radeon backlight

This patch should skip adding a radeon backlight interface on your mac.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 1428 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel

[Bug 65377] Backlight control via /sys/class/backlight/radeon_bl0 not working

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 549 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=65377

Bastian Triller <bastian.triller@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #9 from Bastian Triller <bastian.triller@gmail.com> ---
yes, /sys/class/backlight/radeon_bl0 device is gone.

-- 
You are receiving this mail because:
You are the assignee for the bug.

[-- Attachment #1.2: Type: text/html, Size: 2076 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel