linux-kernel - Re: [REGRESSION][BISECTED] Screen goes blank with ASpeed AST2300 in 6.18-rc2

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Message-ID: <3ca10b2e-fb9c-4495-9219-5e8537314751@googlemail.com>
Date: Wed, 22 Oct 2025 13:23:25 +0200
From: Peter Schneider <pschneider1968@...glemail.com>
To: Thomas Zimmermann <tzimmermann@...e.de>, regressions@...ts.linux.dev,
 LKML <linux-kernel@...r.kernel.org>
Cc: dri-devel@...ts.freedesktop.org, stable@...r.kernel.org,
 jfalempe@...hat.com, airlied@...hat.com, dianders@...omium.org,
 nbowler@...conx.ca, Linus Torvalds <torvalds@...ux-foundation.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Thorsten Leemhuis <regressions@...mhuis.info>
Subject: Re: [REGRESSION][BISECTED] Screen goes blank with ASpeed AST2300 in
 6.18-rc2

Am 22.10.2025 um 12:20 schrieb Thomas Zimmermann:
> Hi
> 
> Am 22.10.25 um 11:16 schrieb Peter Schneider:
>> Am 22.10.2025 um 11:11 schrieb Thomas Zimmermann:
>>> Hi
>>>
>>> Am 22.10.25 um 10:08 schrieb Peter Schneider:
>>>>
>>>> Your patch applied cleanly against 6.18-rc2 and the kernel built fine, but unfortunately it did not solve the issue: 
>>>> my console screen stays blank after booting. This is regardless whether I do a soft reboot, press the reset button 
>>>> or power cycle and do a cold boot. They are all the same.
>>>
>>> Just to be sure: you do see output at the early boot stages (BIOS, boot loader). It's at some later point during 
>>> boot, the driver loads and the display blanks out?
>>
>> Yes, that's correct.
>>
>>> There's another patch attached. does this make a difference?
>>
>> Do I have to apply that against base 6.18-rc2 or against 6.18-rc2 + your previous patch?
> 
> Base 6.18-rc2. All the patches are against this.

So with this new patch against 6.18-rc2, I first got this build error:

   CC [M]  drivers/gpu/drm/ast/ast_mode.o
drivers/gpu/drm/ast/ast_mode.c: In function ‘ast_crtc_helper_atomic_disable’:
drivers/gpu/drm/ast/ast_mode.c:857:12: error: unused variable ‘vgacr17’ [-Werror=unused-variable]
   857 |         u8 vgacr17 = 0xff;
       |            ^~~~~~~
cc1: all warnings being treated as errors


because I always do my kernel builds with CONFIG_WERROR=y. So then I commented out the now superfluous declaration in 
line 857 and the build succeeded. However, unfortunately the issue still persists. The screen still gets blanked on 
reboot (as clarified before, after BIOS/POST messages, Grub boot menu, initial boot messages).

Beste Grüße,
Peter Schneider

-- 
Climb the mountain not to plant your flag, but to embrace the challenge,
enjoy the air and behold the view. Climb it so you can see the world,
not so the world can see you.                    -- David McCullough Jr.

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