linux-kernel - Re: [PATCH 4.19 040/168] drm/radeon: disable AGP by default

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Message-ID: <06ccec09-ecd2-b18f-6234-7409f2a3c30a@amd.com>
Date:   Tue, 18 Aug 2020 12:48:57 +0200
From:   Christian König <christian.koenig@....com>
To:     Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 040/168] drm/radeon: disable AGP by default

Am 18.08.20 um 11:41 schrieb Pavel Machek:
> On Mon 2020-08-17 17:16:11, Greg Kroah-Hartman wrote:
>> From: Christian König <christian.koenig@....com>
>>
>> [ Upstream commit ba806f98f868ce107aa9c453fef751de9980e4af ]
>>
>> Always use the PCI GART instead. We just have to many cases
>> where AGP still causes problems. This means a performance
>> regression for some GPUs, but also a bug fix for some others.
> Yes, and the regressions mean this is not suitable for -stable, right?

The stability fix weight more than the performance regression for some 
GPUs. So this is indeed meant to be back ported to stable.

This just modifies the default of the module parameter. The end user 
case still override it with radeon.agp_mode=4 or 8 if those modes work 
stable for the individual case.

Regards,
Christian.

>
> Best regards,
> 									Pavel