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Date:   Mon, 4 Oct 2021 13:34:21 +0000
From:   Chuck Lever III <>
To:     Thomas Zimmermann <>
CC:     "" <>,
        Linux Kernel Mailing List <>,
        Ainux Wang <>
Subject: Re: 572994bf18ff prevents system boot

> On Oct 4, 2021, at 3:07 AM, Thomas Zimmermann <> wrote:
> (cc:
> Hi
> Am 03.10.21 um 20:09 schrieb Chuck Lever III:
>> Hi-
>> After updating one of my test systems to v5.15-rc, I found that it
>> becomes unresponsive during the later part of the boot process. A
>> power-on reset is necessary to recover.
>> I bisected to this commit:
>> 572994bf18ff ("drm/ast: Zero is missing in detect function")
> You don't have a monitor connected, I guess?

Correct, my lab systems use IPMI and a browser-attached console.

> In that case, we now trigger the helpers that poll for connected monitors. However, the overhead seems rather extreme.
> I'll have to try to reproduce this, or otherwise we can revert the commit.

It's strange, only that system in my lab seems to have a problem.
The others work fine.

Thanks for having a look!

> Best regards
> Thomas
>> Checking out v5.15-rc3 and reverting this commit enables the system
>> to boot again.
>> 0b:00.0 VGA compatible controller: ASPEED Technology, Inc. ASPEED Graphics Family (rev 30) (prog-if 00 [VGA controller])
>>         DeviceName:  ASPEED Video AST2400
>>         Subsystem: Super Micro Computer Inc X10SRL-F
>>         Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
>>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Interrupt: pin A routed to IRQ 18
>>         Region 0: Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
>>         Region 1: Memory at fb000000 (32-bit, non-prefetchable) [size=128K]
>>         Region 2: I/O ports at c000 [size=128]
>>         Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
>>         Capabilities: [40] Power Management version 3
>>                 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
>>                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
>>         Capabilities: [50] MSI: Enable- Count=1/4 Maskable- 64bit+
>>                 Address: 0000000000000000  Data: 0000
>>         Kernel driver in use: ast
>>         Kernel modules: ast
>> --
>> Chuck Lever
> -- 
> Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Maxfeldstr. 5, 90409 Nürnberg, Germany
> (HRB 36809, AG Nürnberg)
> Geschäftsführer: Felix Imendörffer

Chuck Lever

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