Bug 112195 - machine hangs after modprobe i915 modeset=1
Summary: machine hangs after modprobe i915 modeset=1
Status: NEW
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: DRI git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
Depends on:
Reported: 2019-11-01 18:11 UTC by Przemyslaw Kedzierski
Modified: 2019-11-11 11:29 UTC (History)
3 users (show)

See Also:
i915 platform: BSW/CHT
i915 features:

dmesg+logs from netconsole (78.12 KB, text/plain)
2019-11-01 18:11 UTC, Przemyslaw Kedzierski
no flags Details

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Description Przemyslaw Kedzierski 2019-11-01 18:11:00 UTC
Created attachment 145870 [details]
dmesg+logs from netconsole


Steps to reproduce the issue: the screen becomes black and machine hangs after sequence:
rmmod i915
modprobe i915 modeset=1
How often: every time
system architecture: x86_64
kernel version: 5.4.0-rc4 from drm-tip: commit 90d6ad2cbeadd27e867df4e649d61f14b4ac4b77
Linux distribution: Debian 10
Machine or mother board model: Dell Inspiron 3552
Display connector: build in screen
lspci -v -n:
00:02.0 0300: 8086:22b1 (rev 35) (prog-if 00 [VGA controller])
	Subsystem: 1028:06ac
	Flags: bus master, fast devsel, latency 0, IRQ 11
	Memory at 90000000 (64-bit, non-prefetchable) [size=16M]
	Memory at 80000000 (64-bit, prefetchable) [size=256M]
	I/O ports at f000 [size=64]
	[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [d0] Power Management version 2
	Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
	Capabilities: [b0] Vendor Specific Information: Len=07 <?>
	Kernel modules: i915

I have to boot with i915.modeset=0. In other case machine hangs during startup process.
I can reproduce this situation with rmmod i915, and then modprobe i915 modeset=1.
Could you please help me? Thank you.
Comment 1 Lakshmi 2019-11-11 11:29:52 UTC
@Imre, any suggestions here?

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