Bug 112195

Summary: machine hangs after modprobe i915 modeset=1
Product: DRI Reporter: Przemyslaw Kedzierski <pked01>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: RESOLVED MOVED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: imre.deak, intel-gfx-bugs, pked01
Version: DRI git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
i915 platform: BSW/CHT i915 features:
Description Flags
dmesg+logs from netconsole none

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?
Comment 2 Martin Peres 2019-11-29 19:45:28 UTC
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