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
next prev parent 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 [REGRESSION]: drivers/firmware: move x86 Generic System Framebuffers support 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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