Bug 106305

Summary:	Can't change screen brightness on MSI GT73VR with nouveau driver
Product:	Mesa	Reporter:	Geroge T <reportbug>
Component:	Drivers/DRI/nouveau	Assignee:	Nouveau Project <nouveau>
Status:	RESOLVED DUPLICATE	QA Contact:	Nouveau Project <nouveau>
Severity:	enhancement
Priority:	medium
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	msi gt73vr keyboard picture

Description Geroge T 2018-04-28 21:39:55 UTC

Created attachment 139210 [details]
msi gt73vr keyboard picture

Running a MSI GT73VR which has a dedicated button to switch between graphic cards and requires a reboot, or use "MSI VGA Select V0.2 by Zibri" (https://github.com/Zibri/MSI-GT7x-VGA-SWITCH)

Using hardware buttons Fn+Up / Fn+Down to control screen brightness doesn't work with nouveau drivers.

Part of sudo lspci:
01:00.0 VGA compatible controller: NVIDIA Corporation GP104M [GeForce GTX 1080 Mobile] (rev a1)
	Subsystem: Micro-Star International Co., Ltd. [MSI] GP104M [GeForce GTX 1080 Mobile]
	Kernel driver in use: nouveau
	Kernel modules: nvidiafb, nouveau
01:00.1 Audio device: NVIDIA Corporation GP104 High Definition Audio Controller (rev a1)
	Subsystem: Micro-Star International Co., Ltd. [MSI] GP104 High Definition Audio Controller
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel

If I switch to the integrated graphics the Fn keys do work.

Comment 1 Geroge T 2018-04-28 21:43:34 UTC

modinfo nouveau
filename:       /lib/modules/4.15.0-20-generic/kernel/drivers/gpu/drm/nouveau/nouveau.ko

Comment 2 Geroge T 2018-04-28 21:44:13 UTC

srcversion:     035DF1535F8D81478394CE8

Comment 3 Ilia Mirkin 2018-04-28 22:44:04 UTC

I believe that the backlight is just not hooked up for Pascal.

There's a patch in bug #100446 (https://bugs.freedesktop.org/attachment.cgi?id=138646) which may address this.

Comment 4 Geroge T 2018-04-29 10:20:15 UTC

(In reply to Ilia Mirkin from comment #3)
> I believe that the backlight is just not hooked up for Pascal.
> 
> There's a patch in bug #100446
> (https://bugs.freedesktop.org/attachment.cgi?id=138646) which may address
> this.

Would like to test, do I need to recompile the kernel for ubuntu?

Comment 5 Geroge T 2018-04-30 23:39:22 UTC

Just recompiled the kernel from linux-source-4.15.tar.xz, version linux-4.15.17. Patched to add "case NV_DEVICE_INFO_V0_PASCAL:"(In reply to Ilia Mirkin from comment #3)
> I believe that the backlight is just not hooked up for Pascal.
> 
> There's a patch in bug #100446
> (https://bugs.freedesktop.org/attachment.cgi?id=138646) which may address
> this.

Ok finally tested the patch and recompiled kernel linux-4.15.17 on debian, but still same result, no backlight control, it's always at 100%. The folder "/sys/class/backlight/" is totally empty.

Comment 6 Geroge T 2018-04-30 23:41:23 UTC

On KDE Plasma, at least I can use the operating system as normal, but with gnome 3 it's a nightmare, the mouse and user interface is so sluggish that it's impractical to use.

Comment 7 Geroge T 2018-05-01 00:54:02 UTC

Note that I only patched the line "NV_DEVICE_INFO_V0_PASCAL", not any other kind of patch.

Comment 8 Geroge T 2018-05-01 02:05:52 UTC

Ok tested again with the 4 patches from the kernel git I confirm that it works. Definitely the "case NV_DEVICE_INFO_V0_PASCAL:" line has to be added.

Comment 9 Geroge T 2018-05-01 02:06:41 UTC

Closing since it's a dupe

*** This bug has been marked as a duplicate of bug 100446 ***

Comment 10 Geroge T 2018-05-01 02:51:06 UTC

The sluggish was caused by the gnome extension Dash to Dock.

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