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From: Javier Martinez Canillas <javierm@redhat.com>
To: Ilya Trukhanov <lahvuun@gmail.com>
Cc: stable@vger.kernel.org, regressions@lists.linux.dev,
	linux-efi@vger.kernel.org, linux-pm@vger.kernel.org,
	tzimmermann@suse.de, ardb@kernel.org, rafael@kernel.org,
	len.brown@intel.com, pavel@ucw.cz,
	dri-devel <dri-devel@lists.freedesktop.org>
Subject: Re: [REGRESSION]: drivers/firmware: move x86 Generic System Framebuffers support
Date: Thu, 11 Nov 2021 08:31:11 +0100	[thread overview]
Message-ID: <af0552fb-5fb5-acae-2813-86c32e008e58@redhat.com> (raw)
In-Reply-To: <20211111004539.vd7nl3duciq72hkf@lahvuun>

Hello Ilya,

On 11/11/21 01:45, Ilya Trukhanov wrote:

[snip]

>> Can you please share the kernel boot log for any of these cases too ?
>

Thanks a lot for the testing and providing the info!
 
>> This is just a guess though. Would be good if you could test following cases:
>>
>> 1) CONFIG_FB_EFI not set
> 
> /proc/fb:
> 0 amdgpu
> 
> dmesg: https://pastebin.com/c1BcWLEh
> 
> Suspend-to-RAM works.
> 
>> 2) CONFIG_FB_EFI=y and CONFIG_DRM_AMDGPU=m
> 
> /proc/fb before `modprobe amdgpu`:
> 0 EFI VGA
> 
> after:
> 0 amdgpu
> 
> dmesg: https://pastebin.com/vSsTw2Km
> 
> Suspend-to-RAM works.
> 
>> 3) CONFIG_SYSFB_SIMPLEFB=y and CONFIG_FB_SIMPLE=y
> 
> /proc/fb:
> 0 amdgpu
> 1 simple
> 
> dmesg: https://pastebin.com/ZSXnpLqQ
> 
> Suspend-to-RAM fails.
> 
>>
>> And for each check /proc/fb, the kernel boot log, and if Suspend-to-RAM works.
>>
>> If the explanation above is correct, then I would expect (1) and (2) to work and
>> (3) to also fail.
>>

Your testing confirms my assumptions. I'll check how this could be solved to
prevent the efifb driver to be probed if there's already a framebuffer device.

Best regards,
-- 
Javier Martinez Canillas
Linux Engineering
Red Hat


  reply	other threads:[~2021-11-11  7:31 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-10 20:02 Ilya Trukhanov
2021-11-10 22:24 ` Ard Biesheuvel
2021-11-10 23:21   ` Ilya Trukhanov
2021-11-10 23:25     ` Ard Biesheuvel
2021-11-11  0:08       ` Ilya Trukhanov
2021-11-10 23:07 ` Javier Martinez Canillas
2021-11-11  0:45   ` Ilya Trukhanov
2021-11-11  7:31     ` Javier Martinez Canillas [this message]
2021-11-11  9:24       ` Javier Martinez Canillas
2021-11-11 10:52         ` Ilya Trukhanov
2021-11-11 11:13           ` Javier Martinez Canillas
2021-11-11  6:11 ` Thorsten Leemhuis

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