Subject: Re: [PATCH 6.18.8] Revert "drm/amd: Check if ASPM is enabled from PCIe subsystem"

From: Mario Limonciello <[email-masked]>
Date: Tue, 3 Feb 2026 08:42:15 -0600

On 2/3/26 8:39 AM, Greg KH wrote:
> On Sun, Feb 01, 2026 at 01:25:06AM +0100, Bert Karwatzki wrote:
>> This reverts commit 7294863a6f01248d72b61d38478978d638641bee.
>>
>> This commit was erroneously applied again after commit 0ab5d711ec74
>> ("drm/amd: Refactor `amdgpu_aspm` to be evaluated per device")
>> removed it, leading to very hard to debug crashes, when used with a system with two
>> AMD GPUs of which only one supports ASPM.
>>
>> Link: https://lore.kernel.org/linux-acpi/[email-masked]/
>> Link: https://github.com/acpica/acpica/issues/1060
>> Fixes: 0ab5d711ec74 ("drm/amd: Refactor `amdgpu_aspm` to be evaluated per device")
>>
>> Signed-off-by: Bert Karwatzki <[email-masked]>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 3 ---
>>   1 file changed, 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> index 7333e19291cf..ec9516d6ae97 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
>> @@ -2334,9 +2334,6 @@ static int amdgpu_pci_probe(struct pci_dev *pdev,
>>   			return -ENODEV;
>>   	}
>>   
>> -	if (amdgpu_aspm == -1 && !pcie_aspm_enabled(pdev))
>> -		amdgpu_aspm = 0;
>> -
>>   	if (amdgpu_virtual_display ||
>>   	    amdgpu_device_asic_has_dc_support(pdev, flags & AMD_ASIC_MASK))
>>   		supports_atomic = true;
>> -- 
>> 2.47.3
>>
>>
> 
> 
> <formletter>
> 
> This is not the correct way to submit patches for inclusion in the
> stable kernel tree.  Please read:
>      https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
> for how to do this properly.
> 
> </formletter>

FWIW I added a stable tag to the patch when applied to 
amd-staging-drm-next for this.  So it should come back to stable once it 
merges in Linus' tree.