From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org Subject: [Bug 98677] New: [NVAC] iMac9, 1 effective backlight brightness range changes after S3 Date: Thu, 10 Nov 2016 17:33:18 +0000 Message-ID: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2043519868==" Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: nouveau-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Nouveau" To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org List-Id: nouveau.vger.kernel.org --===============2043519868== Content-Type: multipart/alternative; boundary="14787991981.b2e577be.7374"; charset="UTF-8" --14787991981.b2e577be.7374 Date: Thu, 10 Nov 2016 17:33:18 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated https://bugs.freedesktop.org/show_bug.cgi?id=3D98677 Bug ID: 98677 Summary: [NVAC] iMac9,1 effective backlight brightness range changes after S3 Product: xorg Version: unspecified Hardware: x86-64 (AMD64) OS: Linux (All) Status: NEW Severity: normal Priority: medium Component: Driver/nouveau Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Reporter: jefferym-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org Created attachment 127900 --> https://bugs.freedesktop.org/attachment.cgi?id=3D127900&action=3Dedit dmesg output after the resume with some nouveau trace options I have an iMac 9,1 where the behaviour of the backlight of the built in scr= een works differently between the first boot and after a suspend to ram. It appears to be darker at lower values before a suspend than after. kernel: 4.8.6-300.fc25.x86_64 lspci adapter: VGA adapter NVIDIA Corporation C79 [GeForce 9400] [10de:0867] DMI: Apple Inc. iMac9,1/Mac-F2218EA9 I've been booting in EFI mode. I do not know of a regression. I've only tried 4.4 and this 4.8 kernels. I've observed this with X running but I've been testing this without starti= ng a graphical environment. I've been testing by setting setting backlight values via the /sys/backlight/nv_backlight/brightness interface. Before a suspend I can set values such as 40, 70, 100 and the brightness se= ems to be reasonable on the screen. I then suspend to ram via the /sys/power/state interface. Upon resuming the backlight appears to be at 100 percent. If I set the brightness to values such as 30 and 60 the screen remains dark. It is barely visible as a flicker at 70. At 100 it is visible. I've observed that the value of NV50_PDISP_SOR_PWM_DIV (0x0061c080) is 0x1 after a boot but is set to 0x84 after a resume. It appears there's an init script in the bios dump which sets it to the val= ue of 0x84. I have confirmed if I use the nouveau option nouveau.config=3DNvForcePost=3D1 that the behavior after booting is the sam= e as after a resume. The value of 0x61c080 is 0x84. If I `nvapoke 0x061c080 0x1` after a resume the backlight seems to work fai= rly well. I created patch to test this. I expect it isn't the proper solution. I'm attaching the dmesg which includes a resume with the nouveau driver. I'll also attach the vbios dump, acpidump, dmidecode, lspci,=20 I've gathered an mmiotrace of the binary driver as it sets a few brightness values as well. --=20 You are receiving this mail because: You are the assignee for the bug.= --14787991981.b2e577be.7374 Date: Thu, 10 Nov 2016 17:33:18 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://bugs.freedesktop.org/ Auto-Submitted: auto-generated
Bug ID 98677
Summary [NVAC] iMac9,1 effective backlight brightness range changes a= fter S3
Product xorg
Version unspecified
Hardware x86-64 (AMD64)
OS Linux (All)
Status NEW
Severity normal
Priority medium
Component Driver/nouveau
Assignee nouveau@lists.freedesktop.org
Reporter jefferym@gmail.com
QA Contact xorg-team@lists.x.org 

Created attachment 127900 [details]
dmesg output after the resume with some nouveau trace options

I have an iMac 9,1 where the behaviour of the backlight of the built in scr=
een
works differently between the first boot and after a suspend to ram.
It appears to be darker at lower values before a suspend than after.

kernel: 4.8.6-300.fc25.x86_64
lspci adapter: VGA adapter NVIDIA Corporation C79 [GeForce 9400] [10de:0867]
DMI: Apple Inc. iMac9,1/Mac-F2218EA9
I've been booting in EFI mode.
I do not know of a regression. I've only tried 4.4 and this 4.8 kernels.
I've observed this with X running but I've been testing this without starti=
ng a
graphical environment.

I've been testing by setting setting backlight values via the
/sys/backlight/nv_backlight/brightness interface.
Before a suspend I can set values such as 40, 70, 100 and the brightness se=
ems
to be reasonable on the screen.

I then suspend to ram via the /sys/power/state interface.
Upon resuming the backlight appears to be at 100 percent. If I set the
brightness to values such as 30 and 60 the screen remains dark. It is barely
visible as a flicker at 70. At 100 it is visible.

I've observed that the value of NV50_PDISP_SOR_PWM_DIV (0x0061c080) is 0x1
after a boot but is set to 0x84 after a resume.
It appears there's an init script in the bios dump which sets it to the val=
ue
of 0x84. I have confirmed if I use the nouveau option
nouveau.config=3DNvForcePost=3D1 that the behavior after booting is the sam=
e as
after a resume. The value of 0x61c080 is 0x84.

If I `nvapoke 0x061c080 0x1` after a resume the backlight seems to work fai=
rly
well. I created patch to test this. I expect it isn't the proper solution.

I'm attaching the dmesg which includes a resume with the nouveau driver.
I'll also attach the vbios dump, acpidump, dmidecode, lspci,=20

I've gathered an mmiotrace of the binary driver as it sets a few brightness
values as well.

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