NetBSD Problem Report #57882

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Date: Sat, 27 Jan 2024 20:04:36 +0000 (UTC)
From: bbartlomiej.mail@gmail.com
Reply-To: bbartlomiej.mail@gmail.com
To: gnats-bugs@NetBSD.org
Subject: ThinkPad T480 intel GPU missing firmware in 10.0_RC3
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>Number:         57882
>Category:       kern
>Synopsis:       ThinkPad T480 intel GPU missing firmware in 10.0_RC3
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jan 27 20:05:00 +0000 2024
>Last-Modified:  Sun Jan 28 11:00:01 +0000 2024
>Originator:     Bartlomiej Krawczyk
>Release:        10.0_RC3
>Organization:
>Environment:
NetBSD troublemaker.sol 10.0_RC3 NetBSD 10.0_RC3 (GENERIC) #0: Tue Jan 16 08:28:51 UTC 2024  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/amd64/compile/GENERIC amd64

>Description:
On a fresh install of 10.0_RC3 the firmware for i915drmkms seems to be missing. This is a ThinkPad T480 with Intel i7-8650U.

troublemaker# dmesg | grep i915
[     1.037743] i915drmkms0 at pci0 dev 2 function 0: Intel UHD Graphics 620 (GT2) (rev. 0x07)
[     5.671635] i915drmkms0: interrupting at msi6 vec 0 (i915drmkms0)
[     5.698477] i915drmkms0: notice: Failed to load DMC firmware i915/kbl_dmc_ver1_04.bin. Disabling runtime power management.
[     5.868477] [drm] Initialized i915 1.6.0 20200114 for i915drmkms0 on minor 0
[     6.418841] intelfb0 at i915drmkms0


troublemaker# pcictl pci0 list
000:00:0: Intel Core 7G,8G Host Bridge, DRAM (host bridge, revision 0x08)
000:02:0: Intel UHD Graphics 620 (GT2) (VGA display, revision 0x07)
000:04:0: Intel Core 6G Thermal (miscellaneous DASP, revision 0x08)
000:08:0: Intel Core 6G Gaussian Mixture Model (miscellaneous system)
000:20:0: Intel 100 Series xHCI (USB serial bus, xHCI, revision 0x21)
000:20:2: Intel 100 Series Thermal (miscellaneous DASP, revision 0x21)
000:22:0: Intel 100 Series MEI (miscellaneous communications, revision 0x21)
000:28:0: Intel 100 Series PCIe (PCI bridge, revision 0xf1)
000:28:4: Intel 100 Series PCIe (PCI bridge, revision 0xf1)
000:28:6: Intel 100 Series PCIe (PCI bridge, revision 0xf1)
000:29:0: Intel 100 Series PCIe (PCI bridge, revision 0xf1)
000:29:2: Intel 100 Series PCIe (PCI bridge, revision 0xf1)
000:31:0: Intel 200 Series LPC (ISA bridge, revision 0x21)
000:31:2: Intel 100 Series PMC (miscellaneous memory, revision 0x21)
000:31:3: Intel 200 Series HD Audio (mixed mode multimedia, HD Audio 1.0, revision 0x21)
000:31:4: Intel 100 Series SMBus (SMBus serial bus, revision 0x21)
000:31:6: Intel I219-LM (4) Ethernet Connection (ethernet network, revision 0x21)
001:00:0: NVIDIA GeForce MX150 (3D display, revision 0xa1)
002:00:0: Intel XMM 7360 LTE Modem (Cellular wireless, revision 0x01)
003:00:0: Intel Dual Band Wireless AC 8265 (miscellaneous network, revision 0x78)
004:00:0: Intel product 15c0 (PCI bridge, revision 0x01)
005:00:0: Intel product 15c0 (PCI bridge, revision 0x01)
005:01:0: Intel product 15c0 (PCI bridge, revision 0x01)
005:02:0: Intel product 15c0 (PCI bridge, revision 0x01)
006:00:0: Intel product 15bf (miscellaneous system, revision 0x01)
060:00:0: Intel product 15c1 (USB serial bus, xHCI, revision 0x01)
061:00:0: Samsung Electronics (3rd vendor ID) SM981 M.2 NVMe SSD (Flash mass storage, NVMe I/O)

Firmware should be bundled with the driver.
>How-To-Repeat:
Install 10.0_RC3 and use i915 GPU
>Fix:
Bundle required firmware with the driver.

>Audit-Trail:
From: Martin Husemann <martin@duskware.de>
To: gnats-bugs@netbsd.org
Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org,
	netbsd-bugs@netbsd.org
Subject: Re: kern/57882: ThinkPad T480 intel GPU missing firmware in 10.0_RC3
Date: Sun, 28 Jan 2024 09:44:38 +0100

 The DMC firware is optional (and AFAICT mostly unused if present).
 It makes no noticable change in behaviour on any i915 I tested.

 Martin

From: Bartek Krawczyk <bbartlomiej.mail@gmail.com>
To: Martin Husemann <martin@duskware.de>, gnats-bugs@netbsd.org
Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: kern/57882: ThinkPad T480 intel GPU missing firmware in 10.0_RC3
Date: Sun, 28 Jan 2024 11:57:52 +0100

 On 28.01.2024 09:44, Martin Husemann wrote:
 > The DMC firware is optional (and AFAICT mostly unused if present).
 > It makes no noticable change in behaviour on any i915 I tested.

 I understand,
 isn't this runtime power management used at tall within the kernel?

 https://www.kernel.org/doc/html/latest/gpu/i915.html
 ^this mentions it allows for disabling parts of hardware.

 -- 
 Regards
 Bartłomiej Krawczyk

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