[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 Darren Hart changed: What|Removed |Added Assignee|drivers_video-dri at kernel-bu |drivers_platform_x86 at kernel |gs.osdl.org |-bugs.osdl.org -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #15 from Darren Hart --- Thanks for reporting, we're following up on the platform-drivers-x86 mailing list. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 Felipe Ortiz changed: What|Removed |Added CC||fortizc at gmail.com --- Comment #14 from Felipe Ortiz --- I can confirm the problem with 4eebd5a4e72697aac25a8a57d3f888a9d5f80370. I have a MPB 11,5 with AMD/Intel graphics. I recompile the module (a previous version of 4eebd5a4e72697aac25a8a57d3f888a9d5f80370) and brightness adjusts is working again. I see two problems: 1) If someone uses gpu-switch (https://github.com/0xbb/gpu-switch) with this bug screen seem not work, after severals reboots (with different kernels) I can access a terminal and execute gpu-switch -d and then screen seems work again. 2) If you use a Intel card (swiched with gpu-switch) the OSD (activated with functions keys) is so slow and chromium have the same problem (temporary fix is deactivate chromium hw acceleration) is this a intel driver bug? -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #13 from Alex Deucher --- Only the original filer or an admin can change it as far as I know. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #12 from Tim Sammut --- (In reply to Michel Dänzer from comment #8) > > That's an apple-gmux change, not a radeon driver change. Please reassign the > component of this bug report accordingly. Hi. I changed the component based on the output of scripts/get_maintainer.pl, but I do not appear to be able to reassign the bug. Is anyone watching this bug able to reassign it? -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #11 from Tim Sammut --- (In reply to Robert Abraham from comment #6) > commit > 4eebd5a4e72697aac25a8a57d3f888a9d5f80370 > > breaks the backlight for me. Yep, me too. Reverting that change against a 4.2.1 kernel completely fixes the issues. Brightness adjusts and OSD appears. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 Tim Sammut changed: What|Removed |Added Component|Video(DRI - non Intel) |Platform_x86 -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #10 from Michel Dänzer --- It may be easier to contact the apple-gmux developers via e-mail. The scripts/get_maintainer.pl script should be useful for that. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #9 from Tim Sammut --- (In reply to Michel Dänzer from comment #8) > > That's an apple-gmux change, not a radeon driver change. Please reassign the > component of this bug report accordingly. Thanks, I'd be happy to, but I don't see where to but it and looking at other apple_gmux bugs seem scattered. Help!? -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #8 from Michel Dänzer --- (In reply to Robert Abraham from comment #6) > commit > 4eebd5a4e72697aac25a8a57d3f888a9d5f80370 > > breaks the backlight for me. That's an apple-gmux change, not a radeon driver change. Please reassign the component of this bug report accordingly. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #7 from Alex Deucher --- Perhaps the radeon driver should just not attempt to register a backlight interface on Macs since they seem to use the gmux for backlight control. Some one with more knowledge of mac hw should probably comment on how they should be handled. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #6 from Robert Abraham --- commit 4eebd5a4e72697aac25a8a57d3f888a9d5f80370 breaks the backlight for me. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #5 from Tim Sammut --- (In reply to Robert Abraham from comment #2) > But i also have a radeon_bl entry in /sys/class/backlight which has the > correct values. > But no matter which value i echo into > /sys/class/backlight/radeon_bl/brightness i am on max brightness, except i > echo 0. in this case the backlight turns off. > > so i can only choose between backlight off or on max brightness. > it works perfectly fine on 4.0.x kernel though. Just for the record, this is precise how my machine behaves as well. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051
--- Comment #4 from Tim Sammut ---
(In reply to Alex Deucher from comment #1)
> Radeon hardware supports 256 levels of brightness (0-255). The backlight
> integer property max_brightness is thus set to RADEON_MAX_BL_LEVEL (0xff).
> It sounds like GNOME is misinterpreting the value.
Hi Alex, thanks. I don't think is a GNOME issue. This is via /sys and you can
see the max_brightness = -1 here:
$ for F in /sys/class/backlight/*/{type,max_brightness}; do echo $F: $(cat $F);
done | sort
/sys/class/backlight/gmux_backlight/max_brightness: -1
/sys/class/backlight/gmux_backlight/type: platform
/sys/class/backlight/radeon_bl0/max_brightness: 255
/sys/class/backlight/radeon_bl0/type: raw
Manually adjusting the brightness via `echo $level >
/sys/class/backlight/gmux_backlight/brightness` works, but GNOME control of
brightness and the on-screen display do not.
> The radeon backlight code hasn't really changed since it was added so
> presumably something else did. Can you bisect? Since this is a mac,
> it's possible the GPU driver does not actually control the backlight.
> Everything is a one off on macs.
Yeah, but probably not for 3+ weeks... sorry.
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[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 --- Comment #3 from Alex Deucher --- (In reply to Robert Abraham from comment #2) > > it works perfectly fine on 4.0.x kernel though. The radeon backlight code hasn't really changed since it was added so presumably something else did. Can you bisect? Since this is a mac, it's possible the GPU driver does not actually control the backlight. Everything is a one off on macs. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 Robert Abraham changed: What|Removed |Added CC||robert.abraham86 at googlemail ||.com --- Comment #2 from Robert Abraham --- I have a similar problem. gmux_backlight/max_brightness is set to -1. But i also have a radeon_bl entry in /sys/class/backlight which has the correct values. But no matter which value i echo into /sys/class/backlight/radeon_bl/brightness i am on max brightness, except i echo 0. in this case the backlight turns off. so i can only choose between backlight off or on max brightness. it works perfectly fine on 4.0.x kernel though. i will happily provide any information you need. -- You are receiving this mail because: You are watching the assignee of the bug.
[Bug 105051] Radeon sets max_brightness to -1, breaking GNOME backlight control on Macbook Pro mid-2015 11,5
https://bugzilla.kernel.org/show_bug.cgi?id=105051 Alex Deucher changed: What|Removed |Added CC||alexdeucher at gmail.com --- Comment #1 from Alex Deucher --- Radeon hardware supports 256 levels of brightness (0-255). The backlight integer property max_brightness is thus set to RADEON_MAX_BL_LEVEL (0xff). It sounds like GNOME is misinterpreting the value. -- You are receiving this mail because: You are watching the assignee of the bug.
