After suspend/resume cycle ASPEED VGA monitor suffers with "No Signal" state.

[Cary Garrett]

Hello,

An Aspeed VGA monitor, in my case AST 2400, after a suspend/resume 
cycle suffers with a "No Signal" state. This is also true of a 
IPMI/BMC remote console. To restore the "Signal" state requires
a reboot or the following workaround.

To restore the "Signal" state without rebooting issue the
following commands from a SSH session or serial console
after every suspend/resume cycle:

  sudo modprobe -r ast
  sudo modprobe ast
  
This a home media server which is updated infrequently, so
I am unable offer any guidance as to when this issue started 
occurring.

Regards, Cary Garrett



Current environment:

uname -a:
Linux xxxxxx-server 6.8.7-arch1-1 #1 SMP PREEMPT_DYNAMIC Wed, 17 Apr 2024 15:20:28 +0000 x86_64
GNU/Linux

modinfo:
filename:       /lib/modules/6.8.7-arch1-1/kernel/drivers/gpu/drm/ast/ast.ko.zst
license:        GPL and additional rights
description:    AST
author:         Dave Airlie
firmware:       ast_dp501_fw.bin
srcversion:     7E39455BCA2D11E968D8B2B
alias:          pci:v00001A03d00002010sv*sd*bc03sc*i*
alias:          pci:v00001A03d00002000sv*sd*bc03sc*i*
depends:        i2c-algo-bit
retpoline:      Y
intree:         Y
name:           ast
vermagic:       6.8.7-arch1-1 SMP preempt mod_unload 
sig_id:         PKCS#7
signer:         Build time autogenerated kernel key
sig_key:        76:06:C7:84:BC:2F:C6:38:38:61:C1:6F:32:D5:6A:03:88:22:68:1C
sig_hashalgo:   sha512
signature:      30:66:02:31:00:AD:83:EB:D2:9B:91:E6:C3:9B:52:89:51:4B:BB:06:
		DE:D7:44:A6:6B:07:92:AA:75:2A:0B:20:26:73:58:09:DF:C3:86:C6:
		FC:B7:D4:13:5F:5D:35:4D:67:89:73:0E:C2:02:31:00:C3:98:99:67:
		B4:74:02:5C:6D:D3:81:13:D4:9F:B4:F4:CF:37:8A:7C:84:8C:73:BF:
		DF:4D:D5:34:B0:0A:CE:0E:59:67:28:98:07:BF:D7:FA:68:B3:37:43:
		02:1C:59:3E
parm:           modeset:Disable/Enable modesetting (int)

lspci:
04:00.0 VGA compatible controller: ASPEED Technology, Inc. ASPEED Graphics Family (rev 30) (prog-if
00 [VGA controller])
	DeviceName: Onboard VGA
	Subsystem: Super Micro Computer Inc Device 0804
	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 16
	Region 0: Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at f7000000 (32-bit, non-prefetchable) [size=128K]
	Region 2: I/O ports at d000 [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